Relevant bibliographies by topics / Titanium suboxide

Academic literature on the topic 'Titanium suboxide'

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Published: 14 March 2023

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Journal articles on the topic "Titanium suboxide"

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Schwarzer-Fischer, Eric, Anne Günther, Sven Roszeitis, and Tassilo Moritz. "Combining Zirconia and Titanium Suboxides by Vat Photopolymerization." Materials 14, no. 9 (May 4, 2021): 2394. http://dx.doi.org/10.3390/ma14092394.

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A recently developed multi-ceramic additive manufacturing process (multi-CAMP) and an appropriate device offer a multi-material approach by vat photopolymerization (VPP) of multi-functionalized ceramic components. However, this process is limited to ceramic powders with a certain translucency for visible light. Electrically conductive ceramic powders are therefore ruled out because of their light-absorbing behavior and dark color. The goal of the collaborative work described in the article was to develop a material combination for this multi-material approach of the additive vat photopolymerization method which allows for combining electrical conductivity and electrical insulation plus high mechanical strength in co-sintered ceramic components. As conductive component titanium suboxides are chosen, whereas zirconia forms the mechanically stable and insulation part. Since titanium suboxides cannot be used for vat photopolymerization due to their light-absorbing behavior, titania is used instead. After additive manufacturing, the two-component parts are co-sintered in a reducing atmosphere to transform the titania into its suboxides and, thus, attaining the desired property combination. The article describes the challenges of the co-processing of both materials due to the complex optical properties of titania. Furthermore, the article shows successfully co-sintered testing parts of the material combination of zirconia/titanium suboxide which are made by assembling single-material VPP components in the green state and subsequent common thermal treatment. The results of microstructural and interface investigations such as electrical measurements are discussed.
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Eder, Dominik, and Reinhard Kramer. "Stoichiometry of “titanium suboxide”." Physical Chemistry Chemical Physics 5, no. 6 (February 3, 2003): 1314–19. http://dx.doi.org/10.1039/b210004e.

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Wang, Yaye, Randall “David” Pierce, Huanhuan Shi, Chenguang Li, and Qingguo Huang. "Electrochemical degradation of perfluoroalkyl acids by titanium suboxide anodes." Environmental Science: Water Research & Technology 6, no. 1 (2020): 144–52. http://dx.doi.org/10.1039/c9ew00759h.

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Effective degradation of eight perfluoroalkyl acids by electrooxidation on titanium suboxide anodes is correlated to their respective molecular structures, offering insight into their degradation behaviors.
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Wang, Yaye, Randall “David” Pierce, Huanhuan Shi, Chenguang Li, and Qingguo Huang. "Correction: Electrochemical degradation of perfluoroalkyl acids by titanium suboxide anodes." Environmental Science: Water Research & Technology 8, no. 2 (2022): 443. http://dx.doi.org/10.1039/d1ew90044g.

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Liang, Jiabin, Shijie You, Yixing Yuan, and Yuan Yuan. "A tubular electrode assembly reactor for enhanced electrochemical wastewater treatment with a Magnéli-phase titanium suboxide (M-TiSO) anode and in situ utilization." RSC Advances 11, no. 40 (2021): 24976–84. http://dx.doi.org/10.1039/d1ra02236a.

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Martinez, Miranda, and Anil R. Chourasia. "Characterization of Ti/SnO2 Interface by X-ray Photoelectron Spectroscopy." Nanomaterials 12, no. 2 (January 8, 2022): 202. http://dx.doi.org/10.3390/nano12020202.

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The Ti/SnO2 interface has been investigated in situ via the technique of x-ray photoelectron spectroscopy. Thin films (in the range from 0.3 to 1.1 nm) of titanium were deposited on SnO2 substrates via the e-beam technique. The deposition was carried out at two different substrate temperatures, namely room temperature and 200 °C. The photoelectron spectra of tin and titanium in the samples were found to exhibit significant differences upon comparison with the corresponding elemental and the oxide spectra. These changes result from chemical interaction between SnO2 and the titanium overlayer at the interface. The SnO2 was observed to be reduced to elemental tin while the titanium overlayer was observed to become oxidized. Complete reduction of SnO2 to elemental tin did not occur even for the lowest thickness of the titanium overlayer. The interfaces in both the types of the samples were observed to consist of elemental Sn, SnO2, elemental titanium, TiO2, and Ti-suboxide. The relative percentages of the constituents at the interface have been estimated by curve fitting the spectral data with the corresponding elemental and the oxide spectra. In the 200 °C samples, thermal diffusion of the titanium overlayer was observed. This resulted in the complete oxidation of the titanium overlayer to TiO2 upto a thickness of 0.9 nm of the overlayer. Elemental titanium resulting from the unreacted overlayer was observed to be more in the room temperature samples. The room temperature samples showed variation around 20% for the Ti-suboxide while an increasing trend was observed in the 200 °C samples.
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Zuo, Xiaodan, Qiaoyuan Deng, Tao Yang, Jiaqi Liu, Huatang Cao, Hong Jiang, Feng Wen, and Yutao Pei. "Effect of titanium suboxide on the formation of anatase and rutile phases during annealing of C-Doped Ti–O thin film deposited by DC magnetron sputtering." Functional Materials Letters 13, no. 05 (May 28, 2020): 2051021. http://dx.doi.org/10.1142/s1793604720510212.

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C-doped Ti–O films with different titanium suboxide contents are prepared by DC magnetron sputtering deposition at different sputtering powers. The films with different phases are formed after annealing at 873[Formula: see text]K in air. The structure of the films is characterized by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The optical properties and surface roughness of the films are investigated by UV–vis spectroscopy and atomic force microscopy, respectively. Photocatalytic activity of the thin films is studied by degrading the methyl orange solution under xenon lamp (300[Formula: see text]W) irradiation. The results show that the C-doped Ti–O thin films with higher titanium suboxide contents ([Formula: see text]%) tend to form the rutile phase after annealing, whereas the films with a lower titanate content ([Formula: see text]%) are easy to form anatase phase by annealing.
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Teng, Jie, Guoshuai Liu, Jiabin Liang, and Shijie You. "Electrochemical oxidation of sulfadiazine with titanium suboxide mesh anode." Electrochimica Acta 331 (January 2020): 135441. http://dx.doi.org/10.1016/j.electacta.2019.135441.

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Shmychkova, Olesia, Tatiana Luk'yanenko, Valentina Knysh, and Alexander Velichenko. "Titanium Suboxide-Based Composite Electrocatalysts: Physico-Chemical and Semiconductor Properties." ECS Meeting Abstracts MA2022-02, no. 33 (October 9, 2022): 2448. http://dx.doi.org/10.1149/ma2022-02332448mtgabs.

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Titanium dioxide is one of the main products of chemical industry. Due to its optical properties, it is most widely used in the paint and varnish industry and the production of pigments. Its sensory, adsorption, optical, electrical, and catalytic properties are widely recognized as the objects of close attention of researchers [1]. Due to its high chemical inertness, lack of toxicity and low cost, titanium dioxide is increasingly used as a photocatalyst, while it has a number of significant disadvantages: low quantum efficiency of the process due to weak separation of the electron-hole pair, limited absorption spectrum in the ultraviolet region, which makes it impossible to use the energy of sunlight [2,3]. Scientists in all leading countries of the world are engaged in solving these problems. It is known that nanosized TiO2 particles (<50 nm) have the highest photocatalytic activity; therefore, the preparation of TiO2 nanoparticles is one of the ways to reduce the degree of charge recombination and increase the active surface area of the oxide [4]. We propose to use a combined electrochemical-pyrolytic method of nanotube synthesis. This method will allow one to create a porous developed surface of the matrix for electrodeposition of catalytic layers of platinum and palladium; and their subsequent heat treatment at different partial pressures of oxygen will allow one to design composites with different composition. The high number of cationic vacancies in the matrix and the deficiency of oxygen ions will significantly increase the mobility of platinum and palladium atoms during heat treatment, and the resulting composite will have practically metal conductivity, high catalytic activity, selectivity and extended service life. Naked Ti/TiO2 contain a significant amount of X-ray amorphous compounds on the surface, which are most likely hydrated titanium oxides. The main crystalline phase is titanium dioxide in the allotropic anatase form. Metallic titanium is present on the surface in trace amounts. Thermal treatment of this material at a temperature of 500 ºC for 3 hours in an air atmosphere leads to an increase in the proportion of the crystalline phase. The content of metallic titanium increases significantly, reaching about a third. A partial electrochemical reduction of nanotubes allows one to obtain more electrically conductive titanium suboxides. After cathodic reduction of nanotubes for one hour, a galvanic coating with metallic platinum is uniformly deposited on the surface of the material. Thermal treated Ti/TiO2 nanotubes is an n-type semiconductor with a flat-band potential equal to –0.589 V and a carrier concentration of 6×1020 cm-3. Such a high concentration of carriers is obviously due to the small thickness of the oxide film and its nonstoichiometry, as a result of which the surface is not very depleted in electrons, since titanium metal acts as their donor. An original technique was developed for the deposition of platinized Ti/TiO2 nanotubes, including the stage of thermal treatment of the coating in an air atmosphere. It has been shown that the deposition of platinum on the previously reduced surface of nanotubes allows one to obtain composite coatings with a higher electrical conductivity, and the heat treatment of such a coating is characterized by the content of a larger fraction of TiO2, increased adhesion to the current collector, and an increase in the crystallinity of the coating. At the same time, the internal stresses of the coating are reduced by several times. References V.R.A. Ferreira, P.R.M. Santos, C.I.Q. Silva, M.A. Azenha. Latest developments on TiO2-based photocatalysis: a special focus on selectivity and hollownes for enhanced photonic efficiency, Appl. Catal., A, 623, 118243 (2021). S. Palmas, L. Mais, M. Mascia, A. Vacca. Trend in using TiO2nanotubes as photoelectrodes in PEC processes for wastewater treatment, Curr. Opin. Electrochem., 28, 100699 (2021). E. Brillas. A critical review on ibuprofen removal from synthetic waters, natural waters, and real wastewaters by advanced oxidation processes, Chemosphere, 286, 131849 (2022). M. Bellardita, A. Di Paola, L. Palmisano, F. Parrini, G. Buscarino, R. Amadelli, Preparation and photoactivity of samarium loaded anatase, brookite and rutile catalysts, Appl. Catal., B, 104, 291-299 (2011).
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Gong, Yafeng, Yinghua He, An Li, Yi Wang, Jiehua Liu, and Tao Qi. "Palladium-ytterbium bimetallic electrocatalysts supported on carbon black, titanium suboxide, or poly(diallyldimethylammonium chloride)-functionalized titanium suboxide towards methanol oxidation in alkaline media." Ionics 24, no. 10 (February 28, 2018): 3085–94. http://dx.doi.org/10.1007/s11581-018-2506-6.

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Dissertations / Theses on the topic "Titanium suboxide"

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Li, Yung-Hao, and 李永昊. "Synthesis and Characterization of 1- Dimensional Titanium and Titanium Suboxide Nanomaterials." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/97qz3s.

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碩士
國立交通大學
跨領域分子科學國際碩士學位學程
107
In this work, we synthesized Ti metal nanowires, Ti3O5 nanorods and Ti8O15 nanowires by CVD process. With different carrier gas and heating procedure, we can control the morphology and composition of these nanomaterials. Ti3O5 nanorods and Ti8O15 nanowires were synthesized using pure Ar flow. Ti3O5 nanorods was deposited in the region at 800-908 K. Ti8O15 nanowires were deposited at a higher temperature region of 908-1021 K. On the other hand, Ti metal nanowires was synthesized under pure H2 flow. And the CVD instrument was also preheated with H2 flow. Ti metal nanowires was deposited in the temperature region at 1150-1200 K. All the materials’ real surface area was characterized by cyclic voltammetry. The real surface area of Ti metal nanowires, Ti3O5 nanorods and Ti8O15 nanowires were 13.7, 4.7 and 12.9 times the original geometric area. Field emission properties of these materials were also investigated. The turn on field Eo of Ti metal nanowires, Ti3O5 nanorods and Ti8O15 nanowires were 2.3, 3 and 2.6 V/μm. The field enhancement factors (β) of Ti metal nanowires, Ti3O5 nanorods and Ti8O15 nanowires were calculated to be 1293, 653 and 1185. The results suggested that these materials can be applied in the field emitters. And further application in electrochemical devices could be promising.
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Book chapters on the topic "Titanium suboxide"

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Giannetta, Leo G., and Richard J. Behl. "Chemostratigraphic and lithostratigraphic framework of the Eocene Kreyenhagen Formation, Kettleman area, central San Joaquin Basin, California." In Understanding the Monterey Formation and Similar Biosiliceous Units across Space and Time. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.2556(12).

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ABSTRACT The Eocene Kreyenhagen Formation is a widespread siliceous, organic-rich mudstone within the San Joaquin Basin, but it is less studied than the Monterey Formation. This study characterizes the Kreyenhagen Formation in the Kettleman area to define its vertical and lateral variability on the basis redox conditions (Mo, U, Cr), paleoproductivity (biogenic SiO2, P, Ba), and detrital input (Al2O3, TiO2) to determine the dominant environmental conditions during deposition. The Kreyenhagen Formation was correlated across 72 wells over a 4600 km2 (1776 mi2) area, which revealed an eastward thinning from 335 m (1100 ft) to less than 183 m (600 ft). We identified three informal members on the basis of log response and bulk/trace geochemistry: a lower calcareous silty mudstone, a middle organic-rich clayey mudstone, and an upper siliceous silty mudstone. Spatially, the greatest enrichment of total organic carbon, redox proxies, and biogenic silica occurs along Kettleman North Dome. These properties decrease eastward as clay volume, titanium, and aluminum increase. We interpret the Kreyenhagen Formation to record one transgressive-regressive cycle with contemporaneous climatic cooling: a transgression with initial suboxia and calcareous plankton productivity, a highstand with anoxic-euxinic benthic conditions and clastic starvation, and regression with elevated biogenic silica input. The upward transition from a calcareous to siliceous composition may reflect known cooling and upwelling intensification on the middle Eocene California margin. Mo/U and Th/U patterns suggest variable redox conditions across space and time. Lateral compositional trends indicate that eastern areas were proximal to a Sierran clastic sediment source, while western areas were distal and more anoxic.
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Conference papers on the topic "Titanium suboxide"

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Naumann, T., L. M. Berger, M. Ingwerth, and P. Vuoristo. "Titanium Suboxide Coatings Prepared by VPS Spraying." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1441.

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Abstract Titanium oxide is established as an oxide material for thermally sprayed coating solutions and has received increasing interest over the last few years. Scientific and technological research focuses on electrical conductivity, solid lubrication and photocatalytic properties of titanium oxide (TiOx) coatings of differing stoichiometry. The aim of this study was to investigate the effect of oxygen loss by reduction with hydrogen occurring in the conditions of vacuum plasma spraying (VPS) from commercial titanium oxide feedstock on coating microstructure, hardness, phase composition, abrasion wear resistance and electrical resistivity. The X-ray diffraction pattern showed the presence of rutile, with peaks decreasing in intensity with increasing hydrogen content in the plasma-forming gas. The intensities of the peaks showed significant deviations from those of the standard. An increase in hydrogen flow rate did not influence the coating microstructure, hardness or abrasion wear resistance, but it caused the electrical resistivity to decrease. VPS coatings prepared from commercial fused and crushed powder show a resistivity in the range of 0.01-0.1 Ohm*cm, which corresponds exactly to the range published in the literature. Comparison with results for APS- and HVOFsprayed coatings reveals that VPS coatings yield the best combination of abrasion wear resistance and electrical resistivity when commercial titanium oxide spray powder is used.
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Toma, F. L., G. Bertrand, D. Klein, L. M. Berger, and S. Thiele. "Photocatalytic Properties of Coatings Sprayed from TiOx and Tin-2Cr2O2n-1 Powders by APS and VPS." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0946.

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Abstract Titanium dioxide (TiO2) has emerged as an excellent photocatalyst material for environmental purification about two decades ago but only recently few works have focused on the photocatalytic properties of sprayed titanium oxide coatings. So far, the role of oxygen deficiency which can appear as a result of the spray process or by use of titanium suboxide powders on the photocatalytic activity has not been investigated. Also the possible influence of the shear plane structure of titanium suboxides (Magnéli phases) on the photocatalytic activity was not taken into consideration. In the present work, the photocatalytic properties of three powders and coatings sprayed from these powders by APS and VPS are investigated: (1) a commercial fused and crushed titanium oxide powder, (2) an agglomerated and sintered titanium suboxide powder consisting predominantly of Magnéli phases Ti6O11 and Ti5O9, (3) an agglomerated and sintered powder consisting of Ti2Cr2O7 and Ti6Cr2O15 (Magnéli phases in the TiO2- Cr2O3 phase diagram). The phase compositions of the powders and the coatings were investigated by X-ray diffraction. Neither for the spray powders nor for the coatings any ability to reduce the NOx concentration by the photocatalysis was found. From this it is concluded that both oxygen deficiency as well as Magnéli phase structure are not responsible for photocatalytic properties of materials in the Ti-O phase diagram.
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Berger, L. M., S. Thiele, M. Nebelung, O. Storz, and H. Gasthuber. "Spray Powders and Coatings on the Basis of Titanium Suboxides." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0291.

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Abstract Titanium suboxides form a class of ceramic materials possessing such technically interesting properties as electrical conductivity and solid lubrication. Consequently, these materials have a high potential for application as thermally sprayed coatings. In this paper the preparation and characterisation of two spray powders of different composition by agglomeration and sintering with a narrow range of the value n in TinO2n-1 is described. Powders were characterised by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), thermogravimetric measurements (TG), helium pycnometry, nitrogen adsorption and mercury intrusion techniques. The sprayability was tested by plasma spraying. The coating structures were studied by optical microscopy, XRD, TG and TEM. Although the powders were only partially oxidized as a result of the spray process, the crystallographic structure was changed significantly, according to XRD and TEM investigations. As an alternative method of preparation of titanium suboxide spray powders, the reduction of a fused and crushed spray powder with hydrogen is described. Powder particle shape and size distribution are not changed in this process.
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Vuoristo, P., A. Määttä, T. Mäntylä, L. M. Berger, and S. Thiele. "Properties of Ceramic Coatings Prepared by HVOF and Plasma Spraying of Titanium Suboxide Powders." In ITSC2002, edited by C. C. Berndt and E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0488.

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Abstract This work investigates the influence of powder characteristics on thermal spray coatings produced from titanium suboxide powders. The powders used were prepared from commercially fused and ground titanium dioxide reduced in a mixture of hydrogen and argon gas. Two particle sizes were produced and subsequently applied by atmospheric plasma and HVOF spraying. Originally melted and crushed powder fractions served as a reference. All deposits showed high wear resistance, particularly the HVOF-sprayed layers. Paper includes a German-language abstract.
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Stahr, C. C., L. M. Berger, S. Thiele, and S. Saaro. "Thermally Sprayed TiO2-Cr2O3 Coatings with Multifunctional Properties." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1102.

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Abstract Thermally sprayed titanium suboxide (TiOx) coatings are widely used in industrial applications due to their good tribological properties and their electrical conductivity. These properties are mainly dependent on the amount of oxygen in the crystal lattice. Oxygen defects lead to the formation of so-called Magnéli phases. The range of applications is limited by the fact that TiOx tends to reoxidize in many service conditions, especially at elevated temperatures. Also, the extreme conditions in the flame or torch used in the thermal spray process lead to undefined phase changes and defects. In the TiO2-Cr2O3 system, Magnéli phases are also formed, but it is assumed that the properties do not change due to oxidation during spraying and subsequent use. This work shows the possibilities of the new coating materials. Powders with different TiO2 and Cr2O3 contents and prepared by different technologies were used for the investigation of coating properties. Experimental powders with defined phase compositions were prepared. The powders were thermally sprayed and the coatings investigated in terms of phase composition, microstructure, hardness, and abrasion wear resistance.
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Zhao, X., Z. Chen, X. Liu, and C. Ding. "Preparation, Microstructure and Bioactivity of Plasma-Sprayed TiO2 Coating." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0397.

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Abstract In this paper, nano-structured TiO2 coatings have been successfully deposited onto titanium alloy substrates by atmospheric plasma spraying technology using optimized plasma parameters. A chemical treatment method was employed to induce bioactivity on the TiO2 surface. The bioactivity of as-sprayed and chemical treated TiO2 coatings were evaluated by investigating the formation of apatite on their surface after they were soaked in simulated body fluids (SBF) for a period of time. Microstructure and the phase composition of the as-sprayed coating and apatite were analyzed by Field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectrometry (EDS). The results obtained indicate that as-sprayed TiO2 coating consists of rutile, anatase and suboxide such as Ti3O5. The surface of nano-TiO2 coating is covered by nano particles of about 50nm in size. The bonding strength of TiO2 coating with Ti alloy substrate is as high as 40 MPa. The corrosion resistance performance of nano-coating in SBF is better than that of Ti-6Al-4V alloy. The surface of as-sprayed TiO2 coating can not induce bone-like apatite formation. Chemical treatment, such as acid and alkali, can improve bioactivity of TiO2 coating surface.
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Gardon, M., and J. M. Guilemany. "The Influence of Titanium Sub-Oxides in Thermal Sprayed Coatings." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald, and F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0622.

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Abstract The plasma spray process is used to create titanium oxide coatings under the current stoichiometry of titania and titanium suboxides. This study used feedstock powder with Magnéli phases TinO2n-1, slightly reduced titania TiO2-x, and rutile. A factorial design of experiments approach was used to better understand the influence of operational parameters on coating quality, in particular, the electric resistivity and the degree of oxidation of the titanium oxide during the spraying. Firstly, arc current intensity and stand-off distance were studied; the results show strong correlations between particle temperatures and the electric resistivity of the coating. Then, different plasma compositions were used in order to understand the influence of hydrogen in the formation of titanium sub-oxides. The hardness of the most significant coatings was analyzed.
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Berger, L. M. "Titanium Oxide - New Opportunities for an Established Coating Material." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0934.

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Abstract Extensive research activities were conducted over the last few years on coatings made of titanium oxide, an established material for thermally sprayed coating solutions. Multiple existing and potential applications are closely connected with the existence of different titanium dioxide modifications and the formation of suboxides. This provides a basis for discussions on the Ti-O phase diagram as well as the properties and conditions of formation of relevant phases. Coating microstructures, phase compositions and mechanical properties are discussed as a result of interactions of different spray powders in different spray conditions of atmospheric and vacuum plasma spraying (APS and VPS), as well as of high-velocity oxyfuel (HVOF) spraying. The discussion on applications is focused on electrically conductive coatings, coatings with photocatalytic properties and coatings for wear applications.
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