Статті в журналах: "Titanium coating"

1

Luo, Zhong Kuang, Hong Hua Cai, Jian Hong Liu, Wei Liang Hong, and Shaojin Tang. "Preparation of TiO₂ Coating on the Glass and Hydrophilicity under Sunlight Irradiation." Key Engineering Materials 280-283 (February 2007): 827–30. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.827.

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The precursor solution of titanium oxide coating was prepared by using titanium-oxygen sulfide. Solution with PH value of 8.5 was used to for coating on the surface of glass through dipping. The coatings were analyzed with DSC, AFM and XRD. The hydrophilic results of titanium oxide coating were obtained according the water contact angle measurement in the sunlight irradiation condition. The experimental results demonstrate that this solution is a good precursor for coating of titanium oxide, and the coatings treated at a higher temperature have shown good hydrophilic property.

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2

Прохоров, В. М., Е. В. Гладких, Л. А. Иванов, В. В. Аксененков та А. Н. Кириченко. "Состав, структура и механические свойства (Ti-Hf)N-покрытий на титановом сплаве". Журнал технической физики 89, № 5 (2019): 704. http://dx.doi.org/10.21883/jtf.2019.05.47472.173-18.

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AbstractVariations of the composition, structure, and mechanical properties (hardness, elastic modulus) of (Ti–Hf)N coatings with increasing Hf content (Ti : Hf ratio) are reported. As test samples, VT6 titanium alloy plates covered by a magnetron-sputtered titanium hafnium nitride coating have been taken. To see how the coating characteristics depend on Hf content, samples with rated compositions (Ti_0.9Hf_0.1)N, (Ti_0.85Hf_0.15)N, (Ti_0.8Hf_0.2)N, and (Ti_0.7Hf_0.3)N have been studied. The surface and depth element distributions have been found, and the phase composition and the dependence of the titanium nitride lattice parameter on Hf content in the coating have been determined. The depth profiling of a coating’s hardness and elastic modulus has been conducted by instrumental indentation. Hardness and elastic modulus have been found to be maximal (~35 and ~500 GPa, respectively) in (Ti_0.85Hf_0.15)N and (Ti_0.8Hf_0.2)N coatings. In addition, the depth distribution of Hf in these coatings has turned out to be most uniform.

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3

Guriev, Aleksey, Michail Alekseevich Guriev, Sergei Gennadievich Ivanov, Quan Zheng, and Shun Qi Mei. "Complex Saturation of Titanium Alloys with Boron, Chromium and Titanium." Solid State Phenomena 298 (October 2019): 32–37. http://dx.doi.org/10.4028/www.scientific.net/ssp.298.32.

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This work described the technology of boronizing of titanium Grade2 from the generation of the gas phase directly in a sealed container during the decomposition reactions of the powder saturating medium. With such an implementation of the process in a closed volume, waste gas neutralization devices are not required, since the generation and decomposition of active saturating gases occurs in a closed volume. At saturation of titanium from the gas mixture, titanium borides, titanium nitrides, as well as titanium and chromium carbides can be produced in the coating. The microhardness of the coating is 2800–3200 HV0.1. The thickness of the diffusion coatings in this case can be up to75 microns. It is indicated that diffusion coatings on titanium by this technology should not exceed a thickness of more than 100 microns, and if the thickness of the diffusion coating exceeds 100 microns, the risk of chipping will increase.

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4

Yao, Ying Xue, Li Qun Li, and Jian Jun Xi. "Preparation and Performance of Ceramic Coatings Formed by Micro Arc Oxidation on Titanium Alloy." Key Engineering Materials 375-376 (March 2008): 323–27. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.323.

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The effect of technological parameters on MAO ceramic coating were investigated through the technique of micro-arc oxidation (MAO) on TC4 titanium alloy and. Microstructure and morphology of coatings were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that electric parameters and compositions of the electrolyte have notable effects on the growth of MAO ceramic coatings. The cathodic and anodic voltage rise gradually with the oxidation time increasing. The growth rate of ceramic coating is fast at the beginning, and then turns slowly. The ceramic coatings can be divided into three layers from interior to exterior, such as the transition layer, the dense layer and the porous layer. The coating is mainly composed of rutile and anatase and combined with the substrate firmly. The ceramic coating’s composition in inner and outer layers appears quite different. The ceramic coating on titanium alloy is of excellent performance on anti-attrition and anti-corrosion.

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5

Yang, Xiu Dong, Li Zhao Teng, Jian Lu, Qing Rong Wei, Hui Wang, Ji Yong Chen, and Bang Cheng Yang. "Biomimetic Coating on Titanium Metal and Its Excellent Cell Proliferation." Key Engineering Materials 330-332 (February 2007): 613–16. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.613.

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Biomimetic coating on roughed titanium plates were prepared in this work by a cathode deposition method in calcium phosphate solution electrolyte. The coatings of plate-like apatite crystals were deposited on the titanium plates under a constant potential of 2.0V for 60 min at 37. The coating crystals were identified to be carbonate-containing apatite (bone-like apatite) by X-ray diffraction and scanning electronic microscopy. The cell proliferation and adhesion of L929 cells on the titanium metal plates with biomimetic coating and the titanium plates with roughed-only were tested. The results showed that biomimetic coating on titanium surface can enhance the materials bioactivity. The study indicated that cathode method is potential to prepare biomimetic coating on titanium implants with excellent bioactivity.

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6

Zhou, Hong, and Cheng Peng. "Effect of Shroud in Plasma Spraying on Chemical Composition and Thickness of Titanium Coatings." Coatings 11, no. 4 (April 13, 2021): 446. http://dx.doi.org/10.3390/coatings11040446.

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Titanium and its alloys are wildly used in industries. Shrouded plasma spray can be considered as a useful technology to produce low oxide containing titanium coatings. In this paper, the effect of shroud in plasma spraying on chemical composition and thickness of titanium coatings were investigated. Shrouded plasma-sprayed titanium coatings were deposited onto mild steel substrates. Air plasma-sprayed titanium coatings were also deposited for comparison under the same spraying parameters. Those titanium coatings were then studied in terms of microstructure, oxygen and nitrogen contents and coating’s thickness. The titanium coatings were assessed by scanning electron microscopy and quantitative chemical analysis. The results showed that the shroud played a key role in protecting the particles from oxidation in flight. The shrouded titanium coatings exhibited lower oxygen content and an enhanced microstructure. The reduction in air entrainment with the shroud resulted in better heating of the particles and increases in deposition efficiency and coating thickness.

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7

He, Gang, Xia Deng, Yuan Kun Cen, Xiao Yu Li, En Luo, Rong Rong Nie, Yong Zhao, Zhi Hong Liang, and Zhi Qing Chen. "Development and Characterization of Nano-TiO₂/HA Composite Bioceramic Coating on Titanium Surface." Key Engineering Materials 336-338 (April 2007): 1802–5. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1802.

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This research is aimed at the development and characterization of a novel bioceramic coating on the surface of pure titanium. Nano-TiO2/HA composite bioceramic coating was designed and developed on the surfaces of pure titanium discs by sol-gel route. The TiO2 anatase bioceramic coating was employed as the inner layer, which could adhere tightly to the titanium substrate. The porous HA bioceramic coating was employed as the outer layer, which has higher solubility and better short term bioactivity. Conventional HA coatings and commercially pure titanium (cpTi) were taken as control. XRD and SEM were employed to characterize the crystallization, surface morphology and thickness of the coatings. The bioactivities of the coatings were evaluated by the in vitro osteoblasts culture. Results show the nano-TiO2/HA composite bioceramic coating has good crystallization and homogeneous, nano-scale surface morphology. And it adheres tightly to the substrate. The in vitro osteoblasts culture exhibits satisfactory bioactivity.

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8

Liu, Jun Bo, Li Mei Wang, and Jun Hai Liu. "Effect of Titanium Addition on Cracks of Fe-Cr-C Coating by Reactive Plasma Cladding." Materials Science Forum 1027 (April 2021): 163–69. http://dx.doi.org/10.4028/www.scientific.net/msf.1027.163.

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Fe-Cr-C and Fe-Cr-C-Ti coatings were prepared by reactive plasma cladding in this paper. The crack morphology and fracture surface of the Fe-Cr-C coating were observed by SEM. The effect of titanium addition on the crack of Fe-Cr-C coating was analyzed. The results show that the coating cracks mainly consist of crack perpendicular to the fusion line, defect-induced crack and intergranular crack. The crack rate of Fe-Cr-C-Ti coating was obviously decreased after Titanium was added. When the titanium content is below 8 wt.%, with the increase of titanium content, the crack rate of Fe-Cr-C-Ti coating decreases obviously. When titanium content is between 8wt.% and 13wt.%, there are no cracks in the Fe-Cr-C-Ti coating. When the titanium content exceeds 13 wt.%, with the increase of titanium content, a small number of cracks begin to appear. The addition of titanium increases the toughness of the Fe-Cr-C-Ti coating and reduces the stress concentration.

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9

Liu, Wanying, Junjie Yang, Yuhong Qiu, Ying Liu, and Kuanhai Deng. "Titanium carbide’s effects on coatings formed on D16T aluminum alloy by plasma electrolytic oxidation." Anti-Corrosion Methods and Materials 67, no. 1 (January 6, 2020): 48–58. http://dx.doi.org/10.1108/acmm-06-2019-2149.

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Purpose The preferable concentration of titanium carbide was optimized and added as an additive to the micro-arc oxidation electrolyte to produce a high corrosion-resistant coating on D16T aluminum alloy. Design/methodology/approach Ceramic coatings were deposited on D16T aluminum alloy by plasma electrolytic oxidation in alkaline silicate electrolytes with micron titanium carbide particle suspending at different concentrations. Influences of additive concentration on morphology, elemental and phase composition and corrosion resistance of doped PEO coatings were evaluated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical methods, respectively. Findings Results revealed that suspending titanium carbide additives incorporated into ceramic coatings through discharging channels and chemically transformed into amorphous stage. The content of titanium in the doped coatings increased with the increasing concentration of suspending micron additive. Compared with the coating without particle addition, the corrosion resistance of the coating produced in 8 g/L titanium carbide suspension increased more than 20 times. The result indicated that the incorporation of titanium into the PEO coatings formed on the D16T aluminum alloy could effectively improve the corrosion resistance. Originality/value The mechanism of corporation of TiC and the mechanism of improving the corrosion resistance of the coating were proposed.

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10

Gilman, Vitaliy N., Ayrat I. Faskhutdinov, and Igor P. Balabanov. "Increase Effectiveness of Shaving by Using Wear-Resistant Coatings and Preliminary Modeling Cutting." Solid State Phenomena 299 (January 2020): 839–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.839.

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Study of influence the edge and surface preparation and use of various types of coatings on the shaving cutters from the high-speed steel DIN 1.3243 (W6Mo5Cr4V2Co5 - China), with a hardness of 62-64HRc, for processing of the driven gear part, made of steel DIN 1.6523 (20CrNiMoH - China) with a hardness of 156-207 HB is presented. For the analysis, coatings based on titanium nitride (TiN) and a multicomponent coating of titanium and aluminum (AlTiN) were used. The coating on the basis of titanium nitride (TiN) increased the tool life 1.4 times. Multicomponent coating of titanium and aluminum (AlTiN) increased the tool life 1.6 times (AlTiN).

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11

Wang, Feng Feng, Chun Gen Zhou, Sheng Kai Gong, and Hui Bin Xu. "Hot Corrosion Behavior of AlCuFeCr Quasicrystalline Coating on Titanium Alloy with the Mixture of NaCl and Na₂SO₄ Deposit." Materials Science Forum 546-549 (May 2007): 2313–16. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.2313.

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The hot corrosion behavior of titanium alloy and AlCuFeCr quasicrystalline coating on titanium alloy in the presence of a solid mixture of NaCl and Na2SO4 deposit at 700°C was studied. The result shows that weight-gain kinetics for titanium alloy exhibited a linear rate law, while the kinetics of AlCuFeCr quasicrystalline coating displayed parabolic growth rate. The corrosion resistance of the titanium alloy was improved by applying the AlCuFeCr quasicrystalline coating. The corrosive oxide morphology formed on titanium alloy was porous. For AlCuFeCr quasicrystalline coating with the mixture of NaCl and Na2SO4 deposit, the scale formed on the coating surface was compact and uniform. Oxide formed on the surfaces of Al-Cu-Fe-Cr quasicrystalline coatings after hot corrosion consisted of Al2O3.

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12

Rakhadilov, B. K. "OBTAINING OF HYDROXYAPATITE COATINGS ON A TITANIUM SUBSTRATE BY DETONATION-GAS SPRAYING." Eurasian Physical Technical Journal 18, no. 3 (37) (September 24, 2021): 30–36. http://dx.doi.org/10.31489/2021no3/30-36.

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The article considers research results of the formation process of a hydroxyapatite coating on a titanium substrate during detonation spraying. Powders for sputtering and obtained coatings of hydroxyapatite were studied by Raman spectroscopy and X-ray structural analysis. It was determined that the appearance of α-tricalcium phosphatephase is characteristic of a pure hydroxyapatite coating obtained by detonation spraying. Still, the hydroxyapatite phase is retained in the coating composition. Results obtained by Raman spectroscopy indicate that hydroxyapatite is the main phase in coatings. The morphology of the sprayed coatings was characterized using scanning electron microscopy, and the coatings elemental composition analysis was obtained using an energy-dispersive spectrometer detector. Energydispersive spectrometer analysis showed that the elemental composition of the obtained coatings is similar to the elemental composition of the initial powder, which is very important for preserving the coatings services life.

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13

Zhou, Hong. "Porosity and Micro-Hardness of Shrouded Plasma Sprayed Titanium Coatings." Key Engineering Materials 793 (January 2019): 73–77. http://dx.doi.org/10.4028/www.scientific.net/kem.793.73.

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Titanium and its alloys are often used as key materials for corrosion protection. A promising approach to optimize both mechanical properties and corrosion resistance is the use of coating technologies. In this paper, shrouded plasma spray was used as a useful technology to produce low oxide containing titanium coatings. A solid shroud was used to plasma spray titanium coatings to reduce the oxide content. The titanium coatings were assessed by optical microscope, scanning electron microscopy and Vickers microhardness testing. The results showed that the shrouded titanium coatings exhibited an enhanced microstructure. The presence of the shroud and shroud gas flow led to a significant reduction in coating porosity because the reduction in air entrainment with the shroud resulted in better heating of the particles. The shrouded titanium coatings had a lower value of Vickers microhardness and a relative lower standard deviation than the air plasma sprayed titanium coatings.

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14

Kovtunov, A. I., T. V. Semistenova, and A. M. Ostryanko. "Investigating formation, structure and properties of coatings based on Cu–Ti alloys." Voprosy Materialovedeniya, no. 1(93) (January 6, 2019): 175–81. http://dx.doi.org/10.22349/1994-6716-2018-93-1-175-181.

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The paper offers technology of argon-arc surfacing with titanium wire in order to form heat and wear resistant coating based on the titanium cuprides. The influence of surfacing modes on the chemical compound and structure of formed coatings is determined. The wear resistance and heat resistance at 600°C and 800°C were researched for copper–titanium coating with 8–63% titanium.

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15

Anzabi, O., M. M. Aydin, L. S. Ozyegin, F. N. Oktar, Kārlis A. Gross, Gültekin Göller, E. S. Kayali, and E. Z. Erkmen. "Characterization of Plasma Sprayed Yittria Stabilized Zirconia (8 wt %) Hydroxyapatite Coatings." Key Engineering Materials 493-494 (October 2011): 535–38. http://dx.doi.org/10.4028/www.scientific.net/kem.493-494.535.

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Splitting problems at HA-coated implants are generally due to biological reasons. Bond-coatings were used to prevent the splitting problem of zirconia ceramics; this method can be widely seen in industrial applications. Two main groups were used; the first group consisted of spraying a bond layer of titania onto commercially pure titanium. This followed by a spray of HA with 5, 10 and 15 % zirconia (8 % yttria doped) as main layer onto the first bond-coating. For the second group, the samples were coated without bond-coating. Firstly, X-ray diffraction patterns of the starting powders were taken. Then x-ray diffraction patterns of the plasma sprayed samples were taken. In literature, it was seen that 20 % zirconia was sufficient for the transformation into a monoclinic structure for the bond-coated samples. For this study it was found that 10 % zirconia was sufficient to transform to the same structure of the desired crystalline phase transformation. The coating kept its crystal structure and relatively small amount of amorphous transformation was detected. A similar structure was produced using less zirconia. It was thought that the use of titanium-oxide bond-coating layer would play an important role as a third variable in the results. To further investigate these phenomena, more detailed researches must be conducted with using titanium-oxide yittria stabilized zirconia (8 wt %) hydroxyapatite bond-coatings with HA main coatings.

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16

Wang, Li Jie, Ya Zhe Xing, Hong Bo Wang, and Jian Min Hao. "Effect of Sulfurizing Temperature on Formation of Coatings Produced by Nitriding-Sulfurizing Composite Treatment for Ti-6Al-4V Alloy." Advanced Materials Research 97-101 (March 2010): 1558–61. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1558.

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Three composite coatings were prepared by nitriding-sulfurizing processing of Ti-6Al-4V alloy at different sulfurizing temperatures. The microstructure and phase structure of the coatings were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Furthermore, the hardness of the coatings was measured. The effect of the sulfurizing temperature on microstructure of coatings was investigated. The results indicated that the composite coating was mainly comprised of titanium nitrides, titanium sulfides, and titanium. It was found that the phase composition of composite coating changed with the variation of the sulfurizing temperature.

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17

Kardar, Pooneh, and Reza Amini. "Self-cleaning treatment on historical stone surface via titanium dioxide nanocoatings." Pigment & Resin Technology 48, no. 5 (September 2, 2019): 404–8. http://dx.doi.org/10.1108/prt-10-2018-0110.

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Purpose The purpose of this study is to evaluate the possibility of using titanium dioxide coating in the field of architectural heritage. Design/methodology/approach In this research, a titanium dioxide coating was prepared and then applied to the travertine stone surfaces. The nature of the coating was determined through various observations and analyses. Moreover, the effect of photocatalytic self-cleaning was evaluated using an organic dye (Rhodamine B). Findings The results of XRD, DLS and SEM confirmed the formation of small anatase crystals. The hydrophilic behavior on the surface was observed by coatings based on titanium dioxide. Research limitations/implications The self-cleaning ability of titanium dioxide is due to the synergistic effect of its optical inductive property, which is activated with sunlight. Practical implications The self-cleaning coatings are interested for many industries. The reported data can be used by the formulators working in the research and development departments. Social implications Self-cleaning systems are considered as smart coatings. Therefore, the developing of its knowledge can help to extend its usage to different applications. Originality/value The application of titanium dioxide coating in the field of architectural heritage is a great challenge. Therefore, in this research, a titanium dioxide coating was prepared by sol-gel method and then applied on travertine surfaces and its properties were studied.

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18

Partch, Richard E., Yuming Xie, S. T. Oyama, and Egon Matijević. "Preparation and properties of uniform coated colloidal particles. VIII. Titanium nitride on silica." Journal of Materials Research 8, no. 8 (August 1993): 2014–18. http://dx.doi.org/10.1557/jmr.1993.2014.

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Spherical silica particles, dispersed in ethanol/water solutions, were first coated with titania by hydrolysis of added titanium isopropoxide. The coating thickness could be readily adjusted by the ratio of titanium alkoxide concentration to the amount of silica. The coated cores prepared as above were then treated with ammonia in a temperature-programmed reaction to produce a shell of titanium nitride. After nitridation, the powders of the high specific surface area showed electrical conductivity, which depended on the thickness of the coatings.

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19

Sokolov, A. G., and E. E. Bobylyov. "Diffusion Saturation by Titanium from Liquid-Metal Media as Way to Increase Carbide-Tipped Tool Life." Solid State Phenomena 265 (September 2017): 181–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.181.

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The analysis of the strengths and weaknesses of the existing technologies aimed at improving the performance properties of carbide-tipped tools is presented. The results of studies into the process of diffusion metallization by titanium of a carbide-tipped tool TK type from the media of fusible liquid-metal solutions is given. The influence of titanium diffusion coatings on the durability of carbide tools is investigated. A method of providing formation on hard alloys for wear-resistant titanium high-quality functional coatings is described. The thickness of the coating varies depending on the temperature and exposure time, and ranges from 4 to 6 μm. The hardness of the coatings obtained depends on the temperature of the coating and modes of pre-carburizing, and varies from 24100 to 30000 MPa. The microstructure of the coatings is investigated. The coating consists of two layers: the coating and the transition zone, the size and hardness of which depends on the conditions of pre-carburization and modes of application of the coating. The dependence of the coatings thickness on the duration of the plates exposure in the melt, the temperature of coating composition from the coated hard alloy is investigated.

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20

Kalita, V. I., D. I. Komlev, and A. A. Radiuk. "Physics, chemistry and mechanics of formation of bioactive surfaces on implants. Review." Perspektivnye Materialy 3 (2022): 5–23. http://dx.doi.org/10.30791/1028-978x-2022-3-5-23.

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The analysis of literature on bioactive surfaces of volume implants and plasma coatings on their surface is made. Influence of the porous sizes on process of growing new bone in an implant surface it is described. The traditional porous structure of a plasma titanic coating is formed due to decrease in extent of deformation of spraying particles on a substrate and it not optimum for growing of a new bone tissue. Modern dense coatings a hydroxyapatite (HA) - the titan have no necessary porous structure, and transfer of cyclic loading through an external layer is not reliable. In too time comparative researches of 17 surfaces of implants at implantation indicate obvious advantages of plasma HA of coatings is not dependent on degree of their crystallinity. Three-dimensional capillary-porous (TCP) titanium coatings in the form of ridges and cavities with additional HA plasma and microplasma coatings are perspective for medical application due to division of dense and porous volumes of a coating, increase in the area of border with a new bone tissue, higher shear and a possibility of spraying of the HA coating with equilibrium structure at a temperature of a surface of titanium at 550 °C. The analysis of HA coating content phase is made depending on the modes of plasma spraying.

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Cai, Xiao Xiao, Ping Gong, Yi Man, Zhi Qing Chen, and Gang He. "The Construction and Characterization of Nano-FHA Bioceramic Coating on Titanium Surface." Key Engineering Materials 330-332 (February 2007): 333–36. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.333.

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This research was aimed at the construction and characterization of nano-FHA bioceramic coating on titanium surface. Nano-FHA coating was constructed on the surface of commercially pure titanium by sol-gel route. X-ray diffraction (XRD), scanning electromicroscope (SEM) and dissolution test was employed to characterize the obtained coating. In vitro cellular responses of osteoblasts to the coating were also evaluated by MTT assay, ALP assay and SEM observation. Conventional HA coatings and commercially pure titanium (cpTi) were taken as control. Results show the nano-FHA bioceramic coating has good crystallization and homogeneous, nano-scale surface morphology. The dissolution rate of the coating is favorable. The in vitro osteoblasts culture exhibits satisfactory bioactivity.

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22

Gerasimov, D. Yu, and A. A. Sivkov. "Deposition of superhard Ti-C-N plasma coatings in nitrogen atmosphere." Physics and Chemistry of Materials Treatment 5 (2020): 44–48. http://dx.doi.org/10.30791/0015-3214-2020-5-44-48.

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The possibility of obtaining a superhard plasma coating based on titanium, nitrogen and carbon on a metal substrate in a nitrogen atmosphere is shown. The coatings were deposited in one short-term accelerator operation cycle under the action of a hyperspeed jet of electroerosive Ti-containing plasma on the substrate surface. It has been shown by SEM and XRD that nanostructured layers of titanium nitride and titanium carbonitride are formed, providing a high hardness of the coating. Plasma coatings deposited in a nitrogen atmosphere have a higher hardness (19.6 GPa) than coatings deposited in air (16.2 GPa), which is due to a higher content of nitride crystalline phases in the coating material. XRD data showed that the coherent-scattering region of crystalline phases in coatings deposited in an atmosphere of air and in a nitrogen atmosphere is ~10-40 nm, which confirms the nanostructuring of all crystalline phases presented in the coating.

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23

Zhao, Xiao Bing, Xuan Yong Liu, and Chuan Xian Ding. "Bioactivity of Plasma-Sprayed TiO₂ Coating in Simulated Body Fluid by Hydrofluoric Acid Treatment." Materials Science Forum 510-511 (March 2006): 13–16. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.13.

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TiO2 coatings on titanium alloy substrates were prepared by atmospheric plasma spraying using commercial nano-powders. Then, as-sprayed coatings were treated using 10% hydrofluoric acid (HF) at room temperature for 30 seconds. As-sprayed and HF-treated titania coatings were soaked in simulated body fluid to investigate the formation of apatite on their surface. Field-emission scanning electron microscopy was used to observe the surface morphologies, and the phase composition of the as-sprayed coating and apatite were analyzed by X-ray diffraction and energy-dispersive X-ray spectrometry. As-sprayed titania coating is composed of rutile, anatase, and a small quantity of Ti3O5. It exhibited excellent adhesion between the TiO2 coatings and titanium alloy substrates, and the bonding strength was about 38 MPa. After in vitro experiment, a new substance containing calcium and phosphate was formed on the surface of HF-treated TiO2 coatings after being soaked in SBF, while the new substance was not formed on the surface of as-sprayed TiO2 coatings. The results indicated that the bioactivity can be induced to the surface of plasma sprayed TiO2 coatings by hydrofluoric acid treatment.

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Pribytkov, G. A., V. V. Korzhova, M. G. Krinitsyn, and I. A. Firsina. "Synthesis and electron beam facing oftitanium monoboride – titanium matrix composite powders." Voprosy Materialovedeniya, no. 1(93) (January 6, 2019): 88–102. http://dx.doi.org/10.22349/1994-6716-2018-93-1-88-102.

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Titanium monoboride – titanium matrix composite powders have been synthesized by self-propagating high temperature synthesis (SHS) in titanium and boron reactive powder mixtures. Titanium matrix (binder) content varied from 20 to 60%. The SHS powders were cladded on VT1-0 titanium sheet by electron beam facing. Cladded coatings’ thickness varied from 1 to 3 mm depending on the pass number. Phase composition and structure of powders and coatings were investigated by X-ray diffraction, optical and scanning electron microscopy. According to structure investigation and hardness profiles view in the “coating – titanium base plate” transition zone an adhesion of the coating to the base is high. The hardness and abrasive wear resistance tests of the cladded coatings were carried out depending on the powder used for cladding. The maximum hardness of the coatings strengthened by eagle-like titanium monoboride inclusions as compared with VТ1-0 base increases 2.2 times and abrasive wear resistance 3.7 times. According to previously obtained results hardening and abrasive wear resistance of titanium monoboride is much weaker than that of titanium carbide: hardness increases 1.7 times, wear resistance 5.8 times.

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25

Lagrama, Kimberly Rose L., Dexter Nielsen B. Restauro, and Eduardo Magdaluyo Jr. "Porcine-Bone Derived Hydroxyapatite Coating on Anodized Titanium Substrate." Materials Science Forum 864 (August 2016): 86–90. http://dx.doi.org/10.4028/www.scientific.net/msf.864.86.

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Анотація:

Titanium-based alloys are among the most common materials implanted into the human body to permanently support or replace injured or disease-damaged bones due to their high flexural strength and tolerable elastic modulus. However, titanium is considered a bio-inert material and surface modification is needed to improve its bioactivity. Studies have shown that hydroxyapatite coatings are typically bioactive but have poor adhesion strength to titanium. On the other hand, TiO2 coatings strongly adhere to titanium but their bioactivity is limited. This study aims to improve the surface properties of titanium by anodic oxidation and coated with porcine bone-derived hydroxyapatite (HAp). The influence of different anodization voltage on the surface morphology of the titanium substrate and the coating was investigated. The average roughness and wetting angle of the HAp/TiO2 coating increased along with the increasing applied voltage. The increase in roughness and wetting angle is attributed to the change in pore size of TiO2 layer when subjected to varying voltage. With the influence of surface roughness and morphology on the biological performance of titanium implants, the correlation of improved roughness in the coating to the bioactivity can be considered.

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26

Wang, Li, Dong Mei Jia, and Zeng Qiang Zhao. "Photocatalytic Degradation of Methyl Orange Using Doped Titanium Dioxide Coating." Advanced Materials Research 955-959 (June 2014): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.112.

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Анотація:

Titanium dioxide (TiO2) coating was prepared through dipping stainless steel net into titanium dioxide sol and then extracting it. The photocatalytic activities for all titanium dioxide coatings were tested by methyl orange degradation under ultraviolet and visible light irradiation. The photo-absorption property was determined by UV-Vis spectrophotometer. The titanium dioxide coating is photo-catalytically reactive for the degradation of methyl orange. The photo-catalytic activity is influenced by extraction times, degradation time, doping element and light source. La-doped titanium dioxide exhibits the best photocatalytic activity in comparison with undoped, V-doped and La-V-codoped ones. The degradation rate of methyl orange by La-doped titanium dioxide coating reaches 92% after 70 minutes irradiation under ultraviolet light.

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27

Zhang, Guang Lei, Yan Fang Li, Shu Xia Ren, and Jian Min Zhang. "HA Active Coating on Titanium Prepared by Spark Plasma Sintering." Key Engineering Materials 353-358 (September 2007): 1679–82. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1679.

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Анотація:

Hydroxyapatite (HA) active coatings on Titanium were prepared using Spark Plasma Sintering (SPS). This study focused on the effects of the composition and thickness of coating on its bonding strength and the fracture appearance. The results showed that the Ti20wt%HA80wt% coating on Titanium could be well sintered, and bonding strength was improved from 12 MPa to 29 MPa and to 36 MPa along with the reduction of the coat thickness from 0.3mm to 0.2mm and to 0.1mm respectively. When the coating was treated by passivation, the bonding strength of interface increased largely to 48MPa and 64MPa respectively for HA coating and Ti20wt%HA80wt% coating on Titanium body, which the HA did not disassemble, and metallurgical combination between coating and metal was realized at 1180K.

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28

Yuan, Yong Fu, Yan Xiong Yang, Xian Chao Liu, and Cun Ping Liu. "The Study of Hydroxyapatite Coating on Titanium Surfaces though Electrochemical Technology." Advanced Materials Research 926-930 (May 2014): 431–33. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.431.

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Анотація:

Hydroxayapatite coating was prepared on titanium (Ti) substrate by pulsed electrochemical method. Fourier Transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to investigate the microstructure of the coatings. The results showed that Hydroxyapatite coating was successful prepared on titanium substrate by pulsed electrochemical method.

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29

Ren, Limei, Tengchao Wang, Zhaoxiang Chen, Yunyu Li, and Lihe Qian. "Self-Lubricating PEO–PTFE Composite Coating on Titanium." Metals 9, no. 2 (February 1, 2019): 170. http://dx.doi.org/10.3390/met9020170.

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Анотація:

A self-lubricating plasma electrolytic oxidation–polytetrafluoroethylene (PEO–PTFE) composite coating was successfully fabricated on the surface of commercially pure titanium by a multiple-step method of plasma electrolytic oxidation, dipping and sintering treatment. The microstructure and tribological properties of the PEO–PTFE composite coating were investigated and compared with the PEO TiO2 coating and the PTFE coating on titanium. Results show that most of the micro-pores of the PEO TiO2 coating were filled by PTFE and the surface roughness of PEO–PTFE composite coating was lower than that of the PEO TiO2 coating. Furthermore, the PEO–PTFE composite coating shows excellent tribological properties with low friction coefficient and low wear rate. This study provides an insight for guiding the design of self-lubricating and wear-resistant PEO composite coatings.

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30

Yang, Wei, Dapeng Xu, Tao Chen, Jianli Wang, and Jian Chen. "Microstructure and photocatalytic performance of micro arc oxidation coatings after heat treatment." Science and Engineering of Composite Materials 27, no. 1 (March 11, 2020): 19–27. http://dx.doi.org/10.1515/secm-2020-0002.

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AbstractA V-doped titania catalyst was synthesized on titanium substrate by micro-arc oxidation and then it was carried out by heat treatment in nitrogen atmosphere. The surface characteristics of the synthesized titania coatings were investigated by SEM, EDS, XPS and XRD. The synthesized TiO2 coating doped with V (in form of V2O3 and V2O5) showed a large amount of “cellular” bulges with more microscopic defects. The anatase phase of the TiO2 coatings after heat treatment tended to be transformed into rutile phase. As a result, the corrosion resistance and photocatalytic performance of TiO2 coating doped with V after heat treatment had been enhanced.

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31

Komlev, D. I., V. I. Kalita, A. A. Radiuk, A. Iu Ivannikov, and A. S. Baikin. "Adhesion of plasma coatings of hydroxyapatite." Perspektivnye Materialy 11 (2020): 26–33. http://dx.doi.org/10.30791/1028-978x-2020-11-26-33.

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Анотація:

Hydroxyapatite coatings were sprayed with an arc plasma torch argon-nitrogen plasma at a power of 25 kW from a powder with a particle size of 25 – 63 μm at a distance of 95 mm. The samples to which the coatings were applied were preheated in a resistance furnace in an air atmosphere to temperatures in the range of 20 to 600 °C before being sprayed. The adhesion of the plasma coating from hydroxyapatite to the titanium substrate was determined on the pin specimens. The maximum average adhesion value was recorded when the titanium substrate was preheated to a temperature of 550 °C. The results of the study were discussed on the basis of the mechanism for increasing the activity of the titanium substrate during its preheating in order to increase the adhesion of the coating HA and the formation of an equilibrium phase state in the HA coating required for the prolonged use of implants. The received results will be used for formation of optimum structure of the bioactive covering consisting from three-dimensional capillary-porous titanium coatings (3D CP Ti) coating in the form of crests and hollows with porosity of 50% and HA coating applied on its free surface at a temperature of 550 °C. Such process of spraying to provide dense strong and stable a HA coating on implants.

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32

Long, Han Yun, Chi Jen Chung, and Ju Liang He. "Characteristics of Micro-Arc Treated Osseointegrated Porous Hydroxyapatite/Titanium Dioxide Coatings on Titanium Metal." Key Engineering Materials 573 (September 2013): 49–59. http://dx.doi.org/10.4028/www.scientific.net/kem.573.49.

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Анотація:

A rapid and sufficient osseointegrating functions is obviously essential to the patients who suffered the bone reconstruction period. In order to perfectly target this issue, a single-stage micro-arc treated (MAT) coating beneficial from its inherent porous morphologies with controllable pore sizes, strong adhesive force between coatings and substrate and wide selections in electrolytes, is considered. Hydroxyapatite is extensively utilized and identified as mimic composition to human bone and an active bone ingrowth function. However, a controllable high-purity HAp phase via one-stage MAT has not yet been achieved. This study therefore prepares high-purity HAp coatings using one-stage MAT with the electrolyte combination of Calcium acetate and sodium biphosphate dihydrate on a titanium surface through a systematical evaluation of various MAT parameters, including Ca/P ratios of the electrolyte, electrolyte concentrations, working voltages, and treatment periods. Analytical results show that high-purity HAp can grow at a relatively high Ca/P ratio and electrolyte concentration when combined with a relatively high working voltage and long treatment time, which would otherwise grow with CaTiO3 and/or anatase TiO2 and/or rutile TiO2 simultaneously. Additionally, CaTiO3 acts a precursor phase for HAp formation. Ultimately, the highest purity of HAp coating is obtainable on metal titanium using a Ca/P ratio = 2.16 and applying a working voltage of 450 V for 10 min using one-stage MAT. This highest purity of HAp coating also presents excellent level of Ecorr than that on raw Ti alloys. The high Ecorr of HAp coating contributed from its thick and dense oxide layer by working voltage via one-stage MAT, consequently promises its satisfactory protection. The HAp coating demonstrated in this study not only provides the effective approach to produce the desired purity of HAp coatings but compromises its resistance to SBF. The bioactive HAp coating on Ti alloys via one-stage MAT, thus, considers as one significant surface modification for artificial hip joints and dental implants.

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33

Gülses, Aydin, Antonia Lopar, Martha Es-Souni, Marie Emmert, Mona Es-Souni, Eleonore Behrens, Hendrik Naujokat, et al. "A Novel Surface Modification Strategy via Photopolymerized Poly-Sulfobetaine Methacrylate Coating to Prevent Bacterial Adhesion on Titanium Surfaces." Materials 14, no. 12 (June 15, 2021): 3303. http://dx.doi.org/10.3390/ma14123303.

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Анотація:

Recent investigations on the anti-adhesive properties of polysulfobetaine methacrylate (pSBMA) coatings had shown promising potential as antifouling surfaces and have given the impetus for the present paper, where a pSBMA coating is applied via photopolymerization on a macro-roughened, sandblasted, and acid-etched titanium implant surface in order to assess its antifouling properties. Current emphasis is placed on how the coating is efficient against the adhesion of Enterococcus faecalis by quantitative assessment of colony forming units and qualitative investigation of fluorescence imaging and scanning electron microscopy. pSBMA coatings via photopolymerization of titanium surfaces seems to be a promising antiadhesion strategy, which should bring substantial benefits once certain aspects such as biodegradation and osseointegration were addressed. Additionally, commercial SAL-titanium substrates may be coated with the super-hydrophilic coating, appearing resistant to physiological salt concentrations and most importantly lowering E. faecalis colonization significantly, compared to titanium substrates in the as-received state. It is very likely that pSBMA coatings may also prevent the adhesion of other germs.

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34

Volosova, Marina A., Sergey V. Fyodorov, Stepan Opleshin, and Mikhail Mosyanov. "Wear Resistance and Titanium Adhesion of Cathodic Arc Deposited Multi-Component Coatings for Carbide End Mills at the Trochoidal Milling of Titanium Alloy." Technologies 8, no. 3 (June 30, 2020): 38. http://dx.doi.org/10.3390/technologies8030038.

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Анотація:

The work was devoted to the study of the effectiveness of the application of multi-component coatings, TiN–Al/TiN, TiN–AlTiN/SiN, and CrTiN–AlTiN–AlTiCrN/SiN, obtained by cathodic arc deposition to increase the wear resistance of 6WH10F carbide end mills in trochoidal milling of titanium alloy. The surface morphology of the tool with coatings was studied using scanning electron microscopy, and surface roughness texture was estimated. Microhardness and elastic modulus of the coated carbide tool surface layer were determined by nanoindentation. The process of sticking titanium to the working surface of the tool and quantitative evaluation of end mill wear with multi-component coatings at the trochoidal strategy of milling titanium alloy was studied. The CrTiN–AlTiN–AlTiCrN/SiN coating showed the maximum value of the plasticity index at the level of 0.12. The maximum effect of reducing the wear rate was achieved when using a tool with a CrTiN –AlTiN–AlTiCrN/SiN coating when the operating time to failure of end mills was increased by 4.6 times compared to samples without coating, by 1.4 times compared with TiN–Al/TiN coating and 1.15 times compared with TiN–AlTiN/SiN coating.

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35

Carradò, Adele. "Development of Bioactive Hydroxyapatite Coatings on Titanium Alloys." Key Engineering Materials 533 (December 2012): 183–93. http://dx.doi.org/10.4028/www.scientific.net/kem.533.183.

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Анотація:

Bioactive coatings are currently manufacturing using plasma-sprayed technique on metal implant surfaces in order to optimize bone-implant interactions. Nevertheless, some problems exist with coating process, e.g. poor interfacial adhesion, modification of coating properties, and the lack of an existing coating standard. In order to overcome some of the problems with the plasma-spraying process, researchers are investigating other experimental coating methods to enhance the adhesion and to control the coating properties. This paper will discuss the advantages and disadvantages of plasma spraying and the experimental coating processes as pulsed laser deposition as well as spin-coated sol-gel.

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36

Yang, Xiu Dong, Min Tang, Bo Zhang, Hui Chuan Zhao, Xing Dong Zhang, and Ji Yong Chen. "Calcium Phosphate Coating on AT Titanium Plate by CD and BD Methods." Key Engineering Materials 309-311 (May 2006): 731–34. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.731.

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Анотація:

Bonelike apatite coating on metal implants is an effective method to enhance bioactive properties of the metal surface. In the present study, the effectiveness of cathode deposition (CD) coating methods was investigated. And biomimetic deposition (BD) was also investigated as the parallel. The revised simulated body fluid (R-SBF) was chosen as an electrolyte and simulated body fluid. Both deposition methods could produce bonelike apatite coating on rough surfaces of the titanium. The uniformity of the CD coatings were better than the BD coatings’. And CD method was less sensitive to the condition of the titanium plate surfaces and much faster in the coating deposition. The spectra of FTIR showed that the characteristic peaks of CO3 2- apeared on the surface of ceramics, combined with spectra of XRD and SEM, it was concluded that a sertain thickness of bonelike apatite coating could be formed on the acided treatment (AT) titanium plate surfaces by CD method.

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37

Kukareko, Vladimir, Vasile Agafii, Valentin Mihailov, Aleksandr Grigorchic, and Natalia Kazak. "Evaluation of Tribological Properties of Hard Coatings Obtained on Steel C45 by Electro-Spark Alloying." Key Engineering Materials 813 (July 2019): 381–86. http://dx.doi.org/10.4028/www.scientific.net/kem.813.381.

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Анотація:

It was shown that under dry contact conditions, under normal load of to 2 MPa, all coatings demonstrated a significant increase in wear resistance compared to that of the substrate. However, among them, the Mo coating showed the highest wear resistance: ~20 times higher than that of the uncoated steel. That was caused not only by the Mo high microhardness and the lowest initial roughness, but also by the structure of this coating. Meanwhile, the Ti + SiC samples displayed the highest microhardness among investigated coatings. A correlation was established between the microhardness of the coating and the friction coefficient: the larger the microhardness of the coating, the higher is the coefficient of friction. An X-ray analysis of the coatings obtained by ESA on steel with compositions (Ti + Al + C), (Ti + AlN) and (Ti + SiC) revealed phases of titanium carbide, titanium nitride, intermetallic compound AlFe3, and small amounts of aluminum nitride, silicon dioxide and titanium dioxide. This could explain the high microhardness (from 6.8 up to 13.8 GPa) of the obtained coatings.

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38

Silva de Medeiros, Waléria, Luiz Carlos Pereira, Robson Pacheco Pereira, and Marize Varella de Oliveira. "Characterization of CaP Coating Deposited on Porous Titanium." Key Engineering Materials 396-398 (October 2008): 307–10. http://dx.doi.org/10.4028/www.scientific.net/kem.396-398.307.

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Анотація:

Synthetic Hydroxyapatite (HA) has been used as coating in order to enhance biocompatibility of titanium implants. Osseointegration at the implant-bone interface can be positively affected by the presence of HA coating and other biocompatible calcium phosphates (CaP) deposited on titanium implants, due to the high biocompatibility of these bioceramics. The biomimetic process is based on the nucleation and growth of a bioceramic film onto a substrate immersed in a body fluid solution (SBF) and it can be applied to deposit CaP coatings onto metallic substrates. The present work presents results on the characterization by SEM of CaP coating deposited on porous titanium samples by a biomimetic process.

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39

Hu, Wenjie, Sergii Markovych, Kun Tan, Oleksandr Shorinov, and Tingting Cao. "RESEARCH ON WEAR RESISTANCE COATING OF AIRCRAFT TITANIUM ALLOY PARTS BY COLD SPRAYING TECHNOLOGY." Aerospace technic and technology, no. 6 (November 27, 2020): 61–71. http://dx.doi.org/10.32620/aktt.2020.6.07.

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Анотація:

Titanium alloys are the main structural material of aerospace system component, about 75 % of titanium and titanium alloys are used in the aerospace industry, which have the advantages of low density, high specific strength and excellent corrosion resistance, However, its low wear resistance limits the further application of titanium alloy. Therefore, it is of great significance to the surface protection of titanium alloy. Surface coating technology can solve the problems of titanium alloy wear. Currently, there are many coating technologies to solve the problems of wear and corrosion, including the cold spraying(CS), high velocity oxy-fuel(HVOF), the thermo-chemical treatment, the gas phase deposition, the laser melted; the plasma spray coating, the double-plasma surface alloying technology, arc spray, etc, However, when thermal spraying is used to prepare anti-titanium fire coating, the tip of the blade is prone to overheating, thus affecting the performance of the blade. But cold spraying technology is due to the preparation of titanium alloy protective coating in solid state, and the coating has high bonding strength and good impact toughness, furthermore, it can deposit almost any powder materials, such as pure metals, including aluminum(Al), magnesium(Mg), titanium(Ti), nickel(Ni), cobalt(Co)，niobium(Nb), tantalum(Ta), Copper(Cu), tungsten(W), etc; nonmetal such as ceramic, etc; Metallic alloys; composite coating, including Al-Zn, Ti-Al, Ni-Al, Al-Mg, Al-SiC, Al-Al2O3, Ti-Ti6Al4V-Al2O3, Ni-Zn, Ni-cBN, Ni-Zn-Al2O3, Ti-Ta, Al-Mg17Al12, Al-FeSiBNbCu, WC-Co, Cr3C2-NiCr, etc. It can also directly sprayed mixed powder to produce wear resistant coatings, hence, it is widely used. At present, cold-sprayed titanium alloy materials are mainly used in the field of substrate protection and repair, and the field of cold-sprayed titanium alloy additive manufacturing that has appeared in recent years is still in the stage of process and basic theoretical exploration. In order to better understand the latest status of cold spray coating of titanium alloy, in this paper, the wear resistance coating on aircraft titanium alloy parts by cold spraying technology was reviewed, produce wear resistance coating directly by cold spraying technology was analyzed.

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40

Li, De Chao, Xin Liu, Lei Han, Jin Long Li, and Su Cheng. "Studies on the Bioceramic Coating on Titamium Substrate Including Silicon and Calcium by Micro-Arc Oxidation and Osteoblast’s Adhesion and Proliferation on the Coating." Advanced Materials Research 683 (April 2013): 163–67. http://dx.doi.org/10.4028/www.scientific.net/amr.683.163.

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Анотація:

This study used micro-arc oxidation technology for pure titanium alloy surface modification, which 400μm titanium beads were sintered into porous titanium in vacuum conditions, and produced silicon and calcium coatings. Scanning electron microscope(SEM), X-ray diffraction (XRD) and Energy dispersion spectrometer(EDS) were employed to investigate the surface morphology and phase composition of the coatings. The results are listed as follows: the main component of porous titanium MAO coating is anatase TiO2,and the coating introduced silicon and calcium element successfully. The proliferation ability of osteoblasts on the oxidized and unoxidized surface was determined by CCK-8 method, The results indicated that both the proliferation and adhesion ability of osteoblast on the oxidized surface were better than the unoxidized surface.

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41

Zhou, Hong, Zhi Liu, and Liancong Luo. "Microstructure and Phase Composition of Titanium Coatings Plasma Sprayed with a Shroud." MATEC Web of Conferences 142 (2018): 03006. http://dx.doi.org/10.1051/matecconf/201814203006.

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Анотація:

Excellent corrosion resistance has made titanium a preferred material for use in industry with harsh environments. Protective titanium coatings combined with cheap bulk materials are expected to enable sufficient corrosion protection and lower the cost. Plasma spray processing of titanium feedstock becomes a challenging topic of research as titanium powder particles have to experience high temperatures in the flight during the thermal spraying process in an open air environment. In this paper, plasma spraying of titanium has been carried out by using a shroud in order to shield molten particles from reacting with surrounding environment. Microstructure analyses on the titanium coatings were performed by using SEM, EDS and XRD. The results show that the shroud attachment is capable of withstanding high plasma temperatures; the as-sprayed shrouded titanium coating exhibits a similar phase composition as the pure titanium powder, and an enhanced microstructure with a lower porosity for the titanium coating plasma-sprayed with a shrouding system is observed.

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42

Zhu, Sheng, Guo Feng Han, Xiao Ming Wang, Yu Xiang Liu, and Zhi Qian Wang. "Electrochemical Characteristics of TiAl Coating on Aluminum Alloy Surface by Supersonic Particles Deposition." Advanced Materials Research 1051 (October 2014): 199–203. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.199.

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In this study, Ti-45Al-7Nb-4V alloy protective coating which base on γ-TiAl phase was deposited on the surface of 5803 aluminum alloy by supersonic particles deposition technology. Researchers observed the micro-structure of the TiAl alloy casting and coating by SEM, and researched the electrochemical characteristics and the galvanic corrosion between TA2 titanium alloy and 5083 aluminum alloy or TiAl alloy casting and coating by electrochemical work station. The results show that,the galvanic corrosion current between 5083 aluminium alloy and TA2 titanium alloy declines from 16.2μA to 0.27μA after TiAl protecting coatings are prepared on the substrates, besides, the corrosion susceptibility drops from E degree to A degree. It also manifests that the 5083 aluminium alloy with Ti-45Al-7Nb-4V coatings can be contacted and utilized with TA2 titanium alloy directly, which tackles the issues of gavanic corrosion prevention between aluminium alloys and titanium alloys.

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43

Pribytkov, G. A., V. V. Korzhova, M. G. Krinitsyn, and I. A. Firsina. "Synthesis and electron beam facing of TiB – TiC – titanium matrix hybrid composite powders." Voprosy Materialovedeniya, no. 3(95) (January 10, 2019): 89–101. http://dx.doi.org/10.22349/1994-6716-2018-95-3-89-101.

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Анотація:

TiB – TiC – titanium matrix composite powders have been synthesized by self-propagating high temperature synthesis (SHS) in titanium, boron and carbon reactive powder mixtures. A target volume content of the titanium matrix (binder) in the powders was 50%. The SHS powders were cladded on VT1-0 titanium sheet by electron beam facing. A thickness of the cladded coatings varied from 1 to 3 mm depending on the pass number. A phase composition and a structure of the SHS powders and of the cladded coatings were invetigated be X-ray diffraction, optical and scanning electron microscopy. According to structure investigation and hardness profiles in the “coating – titanium base plate” transition zone an adhesion of the coating to the base is high. The hardness and abrasive wear resistance tests of the cladded coatings were carried out depending on the powder used for cladding. The maximum hardness increase of the coatings strengthened by titanium monoboride and titanium carbide inclusions is 2.2 times and abrasive wear resistance – 4.3 times as compared with VТ1-0 base. According to authors’ earlier results enhance hardness and abrasive wear resistant effects of titanium matrix by titanium carbide particles and titanium monoboride is near to the wear resistance of coatings deposited with SHS TiB + Ti powder, but ~5 times less than the wear resistance of coatings surfaced with SHS powder TiC + Ti.

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44

Suzuki, Tsunehisa, Mutsuto Kato, and Yoshiki Shimizu. "Fabrication of Titanium-Based Hard Coatings by Atmospheric Microplasma-Metal Organic Chemical Vapor Deposition Using Titanium Tetraisopropoxide." International Journal of Automation Technology 7, no. 6 (November 5, 2013): 720–25. http://dx.doi.org/10.20965/ijat.2013.p0720.

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Анотація:

The atmospheric microplasma metal organic chemical vapor deposition (AP-MOCVD) using titanium (IV) tetraisopropoxide (TTIP) as a metal alkoxide titanium source was investigated for depositing TiC and TiN hard coatings on stainless steel rods for improving the tool life of electroplated diamond tools. The components and morphology of the coating deposited by microplasma AP-MOCVD with several gas sources and different processes was observed and analyzed. The titanium-based hard coatings composed of TiC, TiN, and TiO2 was successfully obtained by microplasma AP-MOCVD using TTIP as a metal alkoxide titanium source with mixed gases (CH4, N2, H2, and Ar). For the fabrication of titanium-based coatings (TiC, TiN) by microplasma AP-MOCVD, it is important that the carbon and oxygen content, which are components of TTIP, are reduced. The addition of hydrogen gas in the microplasma AP-MOCVD process, followed by nitriding effectively reduces the carbon and oxygen content in the coating.

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45

Cheng, Zhi Fang, Hong Sheng Ding, Hui Rong, and Li Geng Zhao. "Abrasion Resistance of Alumina-Titanium Dioxid Coating at High Temperature." Applied Mechanics and Materials 302 (February 2013): 115–18. http://dx.doi.org/10.4028/www.scientific.net/amm.302.115.

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Анотація:

Nano-structured and micron Al2O3-13%TiO2 coatings were deposited by air plasma spraying.Wear properties of the coatings under different temperature trough SRV friction and wear testing machine were studied, the results shows that the friction coefficient of nano and micron Al2O3-13%TiO2 coatings both have rising trend.with the temperature increases.The wear volume of micron coating is 1.8-2 times that of the nano coating..The nanometer Al2O3-13%TiO2 coating slide with ZrO2 is still compact and has no large crack after abrasion.

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46

Nasakina, E. O., M. A. Sevostyanov, and A. G. Kolmakov. "Surface Modification of Orthopedic Implants Based on Titanium Alloys." Biotekhnologiya 36, no. 5 (2020): 31–40. http://dx.doi.org/10.21519/0234-2758-2020-36-5-31-40.

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Анотація:

This review is devoted to modern technologies for various modifications of a surface of orthopedic implants made from titanium alloys. This approach will allow improving such characteristics of the implants as a corrosion resistance, biocompatibility and osteointegration. Modifications of titanium alloys with hydroxyapatite and calcium phosphate, multifunctional polymer or antibacterial coatings are considered. Analysis of the studies shows that the implant material can only provide a certain degree of biocompatibility and corrosion resistance, and that the nature and design of its surface have a strong influence on the body's response. Surface modification of implants is a good approach to overcome and solve various problems associated with the disadvantages of titanium alloys for orthopedic implants. titanium alloys, orthopedic implant, functional coating, ceramic coating, polymer coating, antibacterial coating The reported study was funded by RFBR, project No 19-18-50015.

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47

Balakrishnan, A., Byoung Cheon Lee, Taik Nam Kim, and B. B. Panigrahi. "Strength and Reliability Performance of Hydroxyapatite Coatings on Titania Treated Ti6Al4V Alloy Using Sol-Gel Precursor." Solid State Phenomena 124-126 (June 2007): 1161–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1161.

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Анотація:

In this study hydroxyapatite (HA) was coated by sol-gel method on Ti6Al4V alloy substrates: on micropolished surface and after titania (titanium oxide) treatment. Former shows the cracks and poor bonding of HA whereas latter shows coating without cracks and higher bonding strength. The higher bonding strength of HA coating in titania treated sample could be attributed to the increased roughness by titanium oxide layer.

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48

Warcaba, Maciej, Kazimierz Kowalski, Agnieszka Kopia, and Tomasz Moskalewicz. "Impact of Surface Topography, Chemistry and Properties on the Adhesion of Sodium Alginate Coatings Electrophoretically Deposited on Titanium Biomaterials." Metallurgical and Materials Transactions A 52, no. 10 (July 24, 2021): 4454–67. http://dx.doi.org/10.1007/s11661-021-06397-0.

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AbstractIn this paper, we report on the electrophoretic deposition and characterisation of pure sodium alginate coatings on titanium biomaterials, the commercially pure titanium CP-Ti1 and Ti–13Nb–13Zr titanium alloy. Various solutions differing in the distilled water to ethanol volume ratio and sodium alginate concentration were used for coating deposition. Uniform, dense and continuous coatings with a thickness up to 1 µm were deposited. The effect of surface topography and morphology, wettability and surface free energy as well as surface chemistry on the coating adhesion to the titanium biomaterials were investigated. The coatings exhibited very good adhesion to the polished and then chemically treated alloy. The adhesion mechanisms were identified. The chemical bonding and interfacial adhesion mechanisms are plausible. The coatings exhibited low surface development, dependent on the applied substrate roughness. Sodium alginate coatings on both substrates showed moderate hydrophilicity and relatively high surface free energy, on average 30 pct higher in comparison with that of the substrate materials. The obtained results will be useful for the further development of composite sodium alginate coatings for enhancing the biological performance of titanium biomaterials.

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49

Heinrichs, Jannica, Tobias Jarmar, Marten Rooth, and Hakan Engqvist. "In Vitro Bioactivity of Atomic Layer Deposited Titanium Dioxide on Titanium and Silicon Substrates." Key Engineering Materials 361-363 (November 2007): 689–92. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.689.

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A non-bioactive implant device can easily be changed to in vitro bioactive with a thin coating of crystalline TiO2. This crystalline coating can be deposited very thin with great step coverage at a low temperature with Atomic Layer Deposition (ALD). An anatase TiO2 coating was built up atomic layer by atomic layer using TiI4 and H2O as precursors in a hot wall furnace. Several hundreds of cycles resulted in a 10-30nm well defined TiO2 of anatase phase on both Si and Ti substrates. These coatings were shown to be bioactive when immersed in simulated body fluid in vitro, as hydroxyapatite (HA) formed on the surface. The surface roughness of the substrates affected the adhesion of the HA. The adhesion was low on the smooth Si but much better on the 100 times rougher Ti. The ALD technique is promising for coating substrates of all shapes with bioactive crystalline TiO2 at a low temperature.

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50

Kulyashova, Kseniya, Yuri P. Sharkeev, and Aizhan Sainova. "Mechanical Properties of Calcium Phosphate Coatings Produced by Method of RF-Magnetron Sputtering on Bioinert Alloys." Advanced Materials Research 1013 (October 2014): 188–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1013.188.

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Results of research of mechanical properties of calciumphosphate coatings produced by the method radio frequency magnetron sputtering on bioinert alloys of titanium, zirconium and were presented. Calcium phosphate coatings show high value of adhesion strength to bioinert metal surface. Calcium phosphate coating on titanium-niobium alloy surface shows the highest value of adhesion strength. Mechanical properties of a composite material based on bioinert alloy and calcium phosphate coating are higher than properties of the components of composite material separately.

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