Journal articles: 'Surface coating ceramic cores'

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Zhou, Pengpeng, Guoqing Wu, Faheem K. Butt, Ye Tao, Jiaqi Zhao, and Hai Nan. "Preparation of Y2O3 Coated CaO Ceramic Cores with Anti-Hydration Performance and High-Interface Stability Against Interface Reaction of Ti–6Al–4V Alloys." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3420–28. http://dx.doi.org/10.1166/jnn.2019.16034.

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In this study, we describe a novel method for preparing Y2O3@CaO ceramic cores with anti-hydration performance and high-interface stability against interface reaction of Ti–6Al–4V alloys. The effect of Y2O3 coating on microstructure, mechanical, anti-hydration properties of ceramic cores and interface reaction with Ti–6Al–4V alloys was studied. The results show that the surface charge of Y2O3 and CaO are opposite at the pH value of 13, which might result in an electrostatic force and become the main driving force of Y2O3 particles absorb on the surface of CaO particles. The Y2O3 coating improved the anti-hydration properties of the CaO-based ceramic cores after sintering at 1450 °C. Meanwhile, the flexural strength improved from 11.2 to 18.8 MPa. At last, the interaction between the ceramic cores and Ti–6Al–4V metal were studied by centrifugal investment casting. Y2O3 coating can effectively reduce the interface reaction and the thickness of the interaction layer in the casting was less than 10 μm. The results suggest that the Y2O3@CaO ceramic with anti-hydration performance provide excellent mechanical and high-interface stability against interface reaction of Ti–6Al–4V alloys.

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Jiao, An Yuan, Feng Hui Wang, and Si Qing Yang. "Study on Making Ceramic Composite Steel Plate by SHS Process." Advanced Materials Research 299-300 (July 2011): 806–9. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.806.

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Large cross-section composite rectangular steel tubes with ceramics inner liner, which can be used directly, and also cut into the ceramics clad plate, were made by a new effective way. The material type, shape and size parameters of cores were determined and thickness and hardness of the ceramic coating were measured. The bond stress between steel substrate and alumina ceramics were analyzed and the bond modes also were checked. The dimension parameters of hemming plate used in the experiment were determined and the bond strength between the coating and tube substrate in normal and tangential direction was examined. The results show that the ceramics coating surface is glossy, which thickness is among 1.5-3.5 mm, the hardness of alumina ceramics inner liner is above HV1100. Metallurgical bonding between steel substrate and ceramics coating could not come into being and the mechanical bonding with lower bonding force is the mainly joint mode.

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Hao, Guo Dong, Yong Liang Guo, Xin Mei Zhang, Gang Liu, and Zhao Hua Jiang. "Preparation of Ceramic Composite Coatings on Ti-6Al-4V Alloy by Surface Nanocrystallization/Micro-Arc Oxidation." Key Engineering Materials 368-372 (February 2008): 1322–24. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1322.

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Nanostructured surface layer was produced on the Ti-6Al-4V alloy by surface mechanical attrition treatment (SMAT) technique, and then the ceramic composite coatings of surface nanocrystallization/ micro-arc oxidation (SNC/MAO) were prepared on the nanocrystallized surface of Ti-6Al-4V alloy by pulsed single-polar micro-arc oxidation in NaAlO2 solution. The phase composition, morphology of surface and section and element content of the nanostructured surface layer and the ceramic coatings were investigated by XRD, TEM, SEM and EDS, respectively. The results showed that after the SMAT technique treatment for a short period of time, the surface layer was refined into ultrafine grains. The thickness of the coatings on the substrate treated by SMAT technique is about 10μm by micro-arc oxidation, which is thicker than the ones on the substrate untreated by SMAT technique, and the ceramic coatings are mainly composed of Al2TiO5. Besides, a bright interface layer comes out between the substrate and the coating when the substrate treated by SMAT technique. The influences of the SMAT technique on the surface morphology of the ceramic coatings also changed. The coatings using the SMAT technique were more compact and less porous than the ones on the substrate untreated by SMAT technique. The content of elements in the nanostructured surface layer on Ti-6Al-4V alloy had changed after the SMAT technique: the content of Ti increased, the content of V decreased, and the content of Al changed a little. The contents of Al and P in the coating increased while the content of Ti decreased.

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Podgornik, Bojan, Marko Sedlaček, Borut Žužek, and Agnieszka Guštin. "Properties of Tool Steels and Their Importance When Used in a Coated System." Coatings 10, no. 3 (March 12, 2020): 265. http://dx.doi.org/10.3390/coatings10030265.

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The introduction of new light-weight high-strength materials, which are difficult to form, increases demands on tool properties, including load-carrying capacity and wear resistance. Tool properties can be improved by the deposition of hard coatings but proper combination and optimization of the substrate properties are required to prepare the tool for coating application. The aim of this paper is to elaborate on tool steel substrate properties correlations, including hardness, fracture toughness, strength and surface quality and how these substrate properties influence on the coating performance. Results show that hardness of the steel substrate is the most influential parameter for abrasive wear resistance and load-carrying capacity, which is true for different types of hard coatings. However, high hardness should also be accompanied by sufficient fracture toughness, especially when it comes to very hard and brittle coatings, thus providing a combination of high load-carrying capacity, good fatigue properties and superior resistance against impact wear. Duplex treatment and formation of a compound layer during nitriding can be used as an additional support interlayer, but its brittleness may result in accelerated coating cracking and spallation if not supported by sufficient core hardness. In terms of galling resistance, even for coated surfaces substrate roughness and topography have major influence when it comes to hard ceramic coatings, with reduced substrate roughness and coating post-polishing providing up to two times better galling resistance.

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Chen, Xiao, Wenlong Zheng, Jing Zhang, Chunyang Liu, Jiqing Han, Li Zhang, and Chunming Liu. "Enhanced thermal properties of silica-based ceramic cores prepared by coating alumina/mullite on the surface of fused silica powders." Ceramics International 46, no. 8 (June 2020): 11819–27. http://dx.doi.org/10.1016/j.ceramint.2020.01.216.

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Miletić, Aleksandar, Peter Panjan, Miha Čekada, Pal Terek, Lazar Kovačević, and Branko Škorić. "TiAlN tribological coatings prepared in industrial deposition system with different rotations." Advanced Technologies & Materials 43, no. 2 (December 15, 2018): 45–49. http://dx.doi.org/10.24867/atm-2018-2-008.

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Efficiency and lifetime of manufacturing tools and mechanica l components may be successfully improved by application of thin ceramic coatings. When it comes to tools for machining of hard materials such as machining of hardened steel, TiAlN is one of the most usually applied coatings. This material is of high hardness, high oxidation resistance and high temperature stability. In this research, surface morphology, mechanical and tribological properties of TiAlN coatings prepared in industrial deposition unit were studied. Three different coatings were prepared by selecting different rotational types in a magnetron sputtering deposition chamber. Surface morphology was characterized by stylus profilometry and atomic force microscopy, mechanical properties by nanoindentation technique and Rockwell indentation test, while pin-on-plate test was used to study tribological behavior. It was found that coatings prepared by higher number of rotations are smoother, harder, and more resistant to cracking and wear. These differences are attributed to differences in coating microstructure which refines with increased number of rotations.

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Abdullah, Adil Othman, Yu Hui, Sarah Pollington, Fenik Kaml Muhammed, Xudong Sun, and Yi Liu. "Comparative Effectiveness of Multiple Laser Scanning and Conventional Techniques on Zirconia Shear Bond Strength." Coatings 9, no. 7 (July 2, 2019): 422. http://dx.doi.org/10.3390/coatings9070422.

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This study aimed to compare the impact of different laser scanning with that of conventional methods on zirconia surface treatment through evaluation of shear bond strength (SBS) values. One hundred and thirty-two sintered zirconia cubic-samples were prepared and randomly divided into six study groups: milling control (without surface treatment); grinding; sandblasting; and three-times, four-times, and five-times laser scanning groups. The treatment process for the first three groups was performed before the zirconia coating, while the last three groups were treated after zirconia coating with veneer slurry through a spraying technique. In the current study, the surface roughness Ra, contact angle measurement, phase transformation, topography and interfaces, SBS in unaged and aged conditions, and fracture mode patterns of zirconia cores were investigated. The results were analyzed using laser confocal scanning microscopy, drop analyzer, X-ray diffractometry (XRD), scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), universal testing machine and stereomicroscope. The results indicated that three-times laser scanned specimens presented higher Ra values than the other studied groups. The minimum contact angle value was detected in the mentioned group, while the control group presented the highest value. The XRD showed phase transformation from tetragonal to monoclinic t–m following grinding and sandblasting. However, the laser scanned specimens and the control group preserved the structural integrity of the zirconia core, presenting the tetragonal phase only. The highest SBS values were recorded in specimens treated with three-times laser scanning in the unaged and aged conditions. A mixed fracture was a common fracture pattern among the studied groups. The results confirmed that SBS could be optimized through three-times laser scanning and it provided better adhesion between zirconia and the veneer ceramic material. Multiple scanning processes of more than three times are not recommended for zirconia surface treatment.

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Ahmed, Nivin M., Walaa M. Abd El-Gawad, Ahmed A. El_Shami, and Eglal M. R. Souaya. "Electrochemical studies on the corrosion performance of new advanced anticorrosive pigments." Pigment & Resin Technology 46, no. 3 (May 2, 2017): 181–93. http://dx.doi.org/10.1108/prt-05-2016-0060.

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Purpose This study aims to synthesize a series of new anticorrosive pigments using a new technique called “core-shell”. This technique is based on depositing thin surface layer of expensive, efficient anticorrosive pigment on a cheap extender. This extender forms the bulk of the new pigments. The new pigments were constructed on cores of either waste silica fume or kaolin comprising 80-85 per cent of their chemical structure, and the ferrite shell was about of 20-15 per cent. Electrochemical studies were undertaken on two series of pigments for comparison between ferrites/silica fume and ferrites/kaolin pigment to show their performance, as the shells are different. Design/methodology/approach The different ferrites/silica fume and ferrites/kaolin pigments were characterized using different analytical and spectrophotometric techniques, such as X-ray fluorescence (XRF) and transmission electron microscopy (TEM). Immersion test and electrochemical impedance measurements were done in 3.5 per cent NaCl. Findings The tests revealed that paint films containing Sr ferrite/silica and Ca ferrite/kaolin were the most effective in corrosion prevention. Practical implications Silica fumes have a large array of uses. These pigments can be applied in various industries such as painting, wooding coating, anti-corruption coating, powder coating, architectural paint and waterproof paints. Treated kaolin can be applied in many industries besides pigment manufacture and paint formulations; it can be applied as a reinforcing filler in rubber, plastics and ceramic composites. Originality/value The new pigments are considered ecofriendly materials, because using them converts a waste product and a natural ore to useful marketable product, leading to reducing cost and saving the environment at the same time.

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Yu, Jian Bo, Zhi Gang Yang, Chuan Jun Li, Kang Deng, and Zhong Ming Ren. "Investigation on Properties of the Silica Ceramic Cores for the Hollow Blades Prepared by the Conversion of the Silicon Resin." Key Engineering Materials 680 (February 2016): 267–71. http://dx.doi.org/10.4028/www.scientific.net/kem.680.267.

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The working conditions of the ceramic cores are extremely harsh with the development of the preparation technology and improvement of the use conditions in the hollow blades, which brings forward high request for the preparation and properties of the ceramic cores. In this paper, silica ceramic powders were firstly coated by the silicon resin. The obtained composite powders were used to prepare the ceramic cores by the dry pressing method. And the phase compositions, microstructure and properties of the ceramic cores with the sintering temperatures were investigated. The results showed that the composite powders prepared by the coating showed good formability. The sintering temperature promoted the formation of the cristobalite. With the increase of the sintering temperature, the porosity of ceramic cores gradually decreased, the shrinkage rate and bulk-density increased. The prepared ceramic cores at 1250°C had highest bend strength of 19.25Mpa.

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Jacobs, Trent. "Against the Grain: Three Proppant Delivery Approaches That Buck the Status Quo." Journal of Petroleum Technology 73, no. 01 (January 1, 2021): 28–31. http://dx.doi.org/10.2118/0121-0028-jpt.

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Pumping proppant down a wellbore is the easy part. Ensuring that the precious material does its job is another matter. A trio of field studies recently presented at the 2020 SPE Annual Technical Conference and Exhibition (ATCE) highlight in different ways how emerging technology and old-fashioned problem solving are moving the industry needle on proppant and conductivity control. These examples include the adoption of unconventional completion techniques in a conventional oil field in Russia and work to validate the use of small amounts of ceramic proppant in North Dakota’s tight-oil formations. Both studies seek to counter widely held assumptions about proppant conductivity. A third study details a recently developed chemical coating that Permian Basin producers are applying “on the fly” to sand before it is pumped downhole. The new adhesive material has found a niche in helping operators mitigate the amount of sand that returns to surface during flowback, a sectorwide issue that drives up completion costs and later may spell trouble for artificial lift systems. Disproving “The Overflush Paradigm” After conventional reservoirs are hydraulically fractured, both from vertical and horizontal wells, it has been standard practice for decades to treat the newly propped perforations with a gentle touch. The approach to this end is known as underflushing. When underflushing, the goal is to leave behind just a few barrels’ worth of proppant-laden slurry over the perforations before attempting to complete further stages. The motivation for this boils down to the need for an insurance policy against displacing the near-wellbore proppant pack and causing the open fracture face to pinch off before it ever has a chance to transmit hydrocarbons. Such carefulness comes at a price. Underflushing raises the risk of needing a cleanout before oil can flow optimally to surface. This not only delays the arrival of first oil, it means extra equipment and personnel are required. However, a more glaring downside to underflushing is that it appears to be an unnecessary precaution. The near-wellbore fracture area is, in fact, more robust than what conventional wisdom allows credit for.

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DA MAIA, B. I., A. H. FUTAMI, and M. A. DE OLIVEIRA. "NANO CERAMIC COATING APPLIED IN SURFACE TREATMENTS." Periódico Tchê Química 15, no. 30 (August 20, 2018): 357–63. http://dx.doi.org/10.52571/ptq.v15.n30.2018.360_periodico30_pgs_357_363.pdf.

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This paper presents practical results of comparison of corrosion resistance in products with application of nano ceramic sealant, the results are compared with products that have surface treatments of electrolytic galvanization, KLT and organometallic. The ceramic nano sealant consists of nano metric colloidal silica. The tests carried out followed the procedures established in the international standard ASTM B117 which assigns test standards to evaluate the corrosion of products. To perform the tests, samples were developed with the application of the nano ceramic sealant and samples that only passed through the process of electroplating, KTL and organometallic electroplating. All samples were submitted to the tests established by ASTM B117. The obtained results, express superior performance of corrosion resistance of the products that went through the process with nano ceramic finish.

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Wang, Bo, and Michael Greene. "Reinforced Mineral Particles by Surface Coating." Advanced Materials Research 311-313 (August 2011): 314–18. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.314.

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Minerals particles such as diatomite and perlite can be reinforced by coating their surfaces with aluminum silicate or zirconium silicate. Scanning electron microscopy shows that the surface of the coated particles is covered by a layer of a glassy/ceramic type coating. Test results indicate that the compaction strength of perlite particles can be increased significantly, approximately 9–fold in the case of the aluminum silicate coating. The aluminum silicate and zirconium silicate coated diatomite fillers also increase paint film scrub resistance either due to the harder glassy/ceramic coatings on diatom surface or due to the stronger bonding between the coated diatomite particles and the resin.

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Petrakova, N. V., E. A. Kuvshinova, A. A. Ashmarin, A. A. Konovalov, Y. O. Nikitina, A. A. Egorov, I. K. Sviridova, S. M. Barinov, and V. S. Komlev. "Calcium phosphate ceramic surface coating via precipitation approach." IOP Conference Series: Materials Science and Engineering 525 (June 7, 2019): 012101. http://dx.doi.org/10.1088/1757-899x/525/1/012101.

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Bakeev, I. Yu, Yu A. Burachevsky, and Yu G. Yushkov. "Creating ceramic electrically insulating coating on metal surface." Journal of Physics: Conference Series 1393 (November 2019): 012074. http://dx.doi.org/10.1088/1742-6596/1393/1/012074.

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Yan, Ai Jun, La Jun Feng, Hong Yan Shen, and Jian Wu. "Surface Modification of Epoxy-Ceramic Coatings by Plasma Treatment." Applied Mechanics and Materials 161 (March 2012): 167–71. http://dx.doi.org/10.4028/www.scientific.net/amm.161.167.

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A coating was made by electrostatic spraying of epoxy resin / TiO2 particles for the purpose of suppressing audible noise caused by corona discharge on high-voltage transmission lines. Wetting property of the coating was improved by oxygen plasma treatment. It was found that the coating became more wettable as the increase of TiO2 content during electrostatic spraying process. With respect to the coating for suppression of audible noise from transmission lines, the optimal mass ratio of TiO2 particles (diameter:5-10μm ) to epoxy resin was 30%, and the contact angle was 73°on the epoxy / TiO2 coating surface which could be reduced to less than 5°after oxygen plasma treatment for 20s.

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Yu, Si Rong, Qiang Yao, and Hong Chao Chu. "Preparation of MAO Ceramic Coating on Ti-6Al-4V Alloy Surface." Materials Science Forum 789 (April 2014): 443–48. http://dx.doi.org/10.4028/www.scientific.net/msf.789.443.

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Micro-arc oxidation (MAO) technology was applied for preparing ceramic coating on Ti alloy. The ceramic coating was characterized using X-ray diffraction, surface roughness meter, eddy current thickness meter, and confocal microscopy. The effects of the current density, the duty cycle and the oxidation time on the thickness and roughness of the ceramic coating were examined. The polarization curves of Ti alloy surface were measured before and after MAO treatment using electrochemical workstation. The results show that the phases of the ceramic coating mainly consist of Ti element, rutile and anatase. With the increase of the current density, the duty cycle and the oxidation time, both thickness and roughness of the ceramic coating increase. After MAO treatment, the corrosion current of Ti alloy decreases, the corrosion potential increases, and the corrosion resistance is improved.

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Wang, Yun Long, Miao Wang, and Zhao Hua Jiang. "Synthesis and Characterization of Aluminum Nitride Ceramic Coating on Aluminum Alloy by Plasma Electrolytic Oxidation in CO(NH₂)₂ Electrolyte." Advanced Materials Research 557-559 (July 2012): 1664–67. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1664.

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aluminum nitride ceramic coating were obtained on LY12 aluminum alloy by plasma electrolytic oxidation in CO(NH2)2 electrolyte. The microstructure of the ceramic coating including phase and elements composition, surface and cross section morphology were investigated. The properties of the ceramic coatings such as surface roughness, thickness and bonding strength were primarily studied. The results show that the ceramic coating on LY12 aluminum alloy surface was AlN coating with the thickness of 12 um. The AlN ceramic coating showed rough and porous. The average diameter of the pores was 6 um and the surface roughness was 1.5 um. The bonding strength of the coating was 18 ± 2 MPa.

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Shin, Eun Ae, Gye Hyeon Kim, Jeyoung Jung, Sang Bong Lee, and Chang Kee Lee. "Addition of Cellulose Nanofibers to Control Surface Roughness for Hydrophobic Ceramic Coatings." Journal of Nanoscience and Nanotechnology 21, no. 8 (August 1, 2021): 4492–97. http://dx.doi.org/10.1166/jnn.2021.19430.

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Hydrophobic ceramic coatings are used for a variety of applications. Generally, hydrophobic coating surfaces are obtained by reducing the surface energy of the coating material or by forming a highly textured surface. Reducing the surface energy of the coating material requires additional costs and processing and changes the surface properties of the ceramic coating. In this study, we introduce a simple method to improve the hydrophobicity of ceramic coatings by implementing a textured surface without chemical modification of the surface. The ceramic coating solution was first prepared by adding cellulose nanofibers (CNFs) and then applied to a polypropylene (PP) substrate. The surface roughness increased as the amount of added CNFs increased, increasing the water contact angle of the surface. When the amount of CNFs added was corresponding to 10% of the solid content, the surface roughness average of the area was 43.8 μm. This is an increase of approximately 140% from 3.1 μm (the value of the surface roughness of the surface without added CNFs). In addition, the water contact angle of the coating with added CNF increased to 145.0°, which was 46% higher than that without the CNFs. The hydrophobicity of ceramic coatings with added CNFs was better because of changes in the surface topography. After coating and drying, the CNFs randomly accumulated inside the ceramic coating layer, forming a textured surface. Thus, hydrophobicity was improved by implementing a rugged ceramic surface without revealing the surface of the CNFs inside the ceramic layer.

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Sultana, Rumana, Jing Zhou Yang, and Xiao Zhi Hu. "Processing of Layered Hydroxyapatite Ceramic Composites." Advanced Materials Research 275 (July 2011): 143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.275.143.

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Layered hydroxyapatite (HA) based ceramic composites consisting of a strong ceramic composite core, 3 mol% yttrium stabilized zirconia (3Y-TZP) with 30 or 40 vol% HA, and a HA-rich porous coating were fabricated using a coating deposition and co-sintering process in the present study. The aim is to develop HA-based bio-ceramic composites that retain the bio-compatibility of HA and the preferred scaffold structure, but have much improved structural properties required for implants. Two different coating techniques, sol-gel derive HA coating and HA solution coating, have been used to deposit the HA coating on the strong HA-containing 3Y-TZP core, which has been pre-sintered at 900°C and has a green-machined surface finish. The upper limit for the final sintering of the layered ceramic composites is set at 1,350°C based on the individual sintering properties of HA and 3Y-TZP. SEM observations have been conducted on the coating surface, sectioned surface of coating and substrate/core to characterize the microstructures of coating and substrate and their interface. Preliminary mechanical tests and XRD tests are also performed to characterise the structural properties at different temperatures.

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Rosenstiel, S. F., P. K. Gupta, R. A. Van Der Sluys, and M. H. Zimmerman. "Strength of a dental glass-ceramic after surface coating." Dental Materials 9, no. 4 (July 1993): 274–79. http://dx.doi.org/10.1016/0109-5641(93)90074-z.

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Choules, B. D., and K. Kokini. "Architecture of Functionally Graded Ceramic Coatings Against Surface Thermal Fracture." Journal of Engineering Materials and Technology 118, no. 4 (October 1, 1996): 522–28. http://dx.doi.org/10.1115/1.2805951.

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An analytical study was performed to study the effect of architecture on the initiation of surface cracking in multilayer ceramic coatings. Two modes of crack initiation were considered: 1) tension resulting from stress relaxation, and 2) cyclic thermal fatigue. Transient temperature distributions were determined using a finite difference technique, and stress distributions were calculated using a multilayer beam theory. The results showed that as more layers were added and as the ceramic coating became thinner, lower maximum surface stresses resulted during cooling after stress relaxation. Also, a thick eight layer coating had similar thermal fatigue behavior to a thin single layer coating. It was determined that a thick multilayer coating adds a significant amount of thermal protection when compared to a thin single layered coating.

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Wang, Can Ming, Hong Fei Sun, Qiang Song, and Qiong Qiong Yan. "Application of Wear Resistant Coating Technology on Coating Blade." Key Engineering Materials 353-358 (September 2007): 1761–64. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1761.

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Coating blade wears seriously in paper coating process. Wear mechanism was analyzed in this article. A new technology of surface coating process was introduced to increase the hardness of the edge of coating blade and thus to prolong its service life. Surface coating preparing process on blade was studied and metal-ceramic compound coating prepared successfully on the edge of coating blade with AT13 (Al2O3+13%TiO2) wear resistant material by plasma spraying process. NiCrAl alloy powder was used as under coat material. Microstructure of the coating is dense. The coating bonds well with the matrix and have high hardness. Results of grain-abrasion testing show that wear-resisting property of the metal/ceramic compound coating is about 7-8 times as that of steel blade.

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Guo, Xiong Hua, Mao Fu Liu, and Chang Rong Zhao. "Surface Roughness Prediction in Precision Surface Grinding of Nano-Ceramic Coating Based on Improved ANFIS." Applied Mechanics and Materials 44-47 (December 2010): 2293–98. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2293.

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For improving surface integrity and machining quality after precision grinding of the parts of nano-ceramic coating, and investigating its prediction technique of surface roughness, the prediction model of surface roughness in precision surface grinding of nano-ceramic coating based on adaptive network-based fuzzy inference system (ANFIS) was proposed in this paper. Then, the proposed prediction model was improved by hybrid Taguchi genetic algorithm (HTGA). At last, by comparative analysis of prediction results from traditional BP neural network model, simple ANFIS model and improved ANFIS model, the effectiveness of the proposed model was verified using grinding parameters and measured surface roughness in grinding tests as training and testing samples. It showed that the prediction accuracy of the improved ANFIS model proposed in this paper was higher, and it was an effective prediction method of surface roughness in precision grinding of nano-ceramic coating.

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Qin, Ye Xia, Ai Bing Du, Rui Zhang, and Wei Pan. "Properties of In Situ Synthesized Alumina Ceramic Core Composites." Key Engineering Materials 368-372 (February 2008): 724–25. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.724.

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A series of alumina-based ceramic cores were in situ prepared. Effect of kyanite on the properties of ceramic core was discussed. The results indicated that the microstructure of the core is characterized by the presence of unreacted Al2O3 particles having a polycrystalline composition consisting essentially of in-situ synthesized 3Al2O3 .2SiO2 on the surface of the Al2O3 particles. The ceramic cores of kyanite contents sintered at 1500oC for 3 h have almost no creep deformation.

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Chen, Fei, Hai Zhou, Chen Chen, Fan Xiu Lu, and Fan Xiu Lu. "Study On the Corrosion Resistance Properties of the Ceramic Coating Obtained Through Microarc Oxidation on the Aluminium Alloy Surface." Key Engineering Materials 353-358 (September 2007): 1733–36. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1733.

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Oxidation ceramic coating was directly synthesized on LY12 aluminium alloy by micro-arc oxidation (MAO) process in Na2SiO3 electrolyte solution with the Na2WO4-KOH-Na2EDTA addition. The corrosion resistance of the coating was tested using CS300P electrochemical corrosion workshop in 3.5% NaCl solution. Using the scanning electron microscopy (SEM) and X-ray diffraction (XRD), the cross-section microstructure, the surface morphology and the phase structure of the micro-arc oxidation ceramic coating were analyzed. The results showed that the corrosion resistance of the micro-arc oxidation ceramic coating in 3.5% NaCl solution was enhanced remarkably, the corrosion velocity was obviously slowed down. The thickness of micro-arc oxidation ceramic coating was about 11μm. The final phases in the coating were found to be α-Al2O3 and γ-Al2O3. The mechanism of the oxidation ceramic coating formation was investigated too.

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Yu, Bo Lin. "A Surface Composite Coating Elevator Safety Gear Wedge." Advanced Materials Research 838-841 (November 2013): 148–51. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.148.

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In this paper, an elevator safety gear wedge with surface metal-ceramic composite coatings is proposed. After composite coating, the friction performance of the elevator safety gear wedge is very stable at high temperature, because of high hardness and high temperature oxidation resistance of coating material. And the friction coefficient becomes small by coating ceramic. In this research, six samples with different coating are prepared. These samples are installed in elevator safety system, and related speed parameters and stopping distance of elevator are tested. A conclusion can be drawn that sample 4 with 45# steel substrate and NiCrBSi-60 coating has a suitable friction coefficient, and the deceleration of elevator is controlled in the range of 0.2 to 1.0g when sample is installed in safety gear system.

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Bu, Hai Tao, Zhao Hua Jiang, and Zhong Ping Yao. "Preparation of Micro-Arc Oxidation Ceramic Coating and Application in Degradation Rhodamine B." Applied Mechanics and Materials 687-691 (November 2014): 4210–13. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.4210.

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A ceramic coating grows on the surface of Q235 carton steel in situ by the micro-arc oxidation method and the silicate electrolyte system; and the phase composition, surface topography and elementary composition of the ceramic coating are analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (EDS). The results show that the ceramic coating growing on the surface of Q235 carton steel in situ presents an irregular porous structure; and the electrolyte and the element in the basal body exist in the ceramic coating in the form of amorphous state. And then, the author degrades the rhodamine B solution by the home-made ceramic coating and H2O2Fenton system, so that the degradation rate of the rhodamine B solution can reach 97%; and meanwhile, the degradation rate is not reduced along the increased using times.

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Liu, Boda, Zixin Deng, and Defu Liu. "Preparation and Properties of Multilayer Ca/P Bio-Ceramic Coating by Laser Cladding." Coatings 11, no. 8 (July 26, 2021): 891. http://dx.doi.org/10.3390/coatings11080891.

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In order to enhance the bioactivity and wear resistance of titanium (Ti) and its alloy for use as an implant surface, a multilayer Ca/P (calcium/phosphorus) bio-ceramic coating on a Ti6Al4V alloy surface was designed and prepared by a laser cladding technique, using the mixture of hydroxyapatite (HA) powder and Ti powder as a cladding precursor. The main cladding process parameters were 400 W laser power, 3 mm/s scanning speed, 2 mm spot diameter and 30% lapping rate. When the Ca/P ceramic coating was immersed in simulated body fluid (SBF), ion exchange occurred between the coating and the immersion solution, and hydroxyapatite (HA) was induced and deposited on its surface, which indicated that the Ca/P bio-ceramic coating had good bioactivity. The volume wear of Ca/P ceramic coating was reduced by 43.2% compared with that of Ti6Al4V alloy by the pin-disc wear test, which indicated that the Ca/P bio-ceramic coating had better wear resistance.

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Tang, Yan, Jin Yong Xu, Fang Yong Ye, Cheng Gao, Jing Chun Zhang, and Ya Juan Liu. "Antiwear Behavior of Micro-Arc Oxidated Coating Rubbing on Abrasive Paper." Materials Science Forum 704-705 (December 2011): 1210–15. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.1210.

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To research the tribological properties of micro-arc oxidized ceramic coating in extreme friction condition, ceramic coatings were tested with 1000# waterproof sand paper friction pair for the first time. The phase composition of ceramic coating was analyzed by X-ray diffraction (XRD).Micro structures of ceramic coating surface were observed by scanning electron microscopy (SEM). Friction coefficient of ceramic coating was measured by ball-on-disc wear tester with a 3 mm steel ball. Wear weight loss and wear rate of ceramic coating were measured and calculated by photoelectron balance. The results show that ceramic coatings in various roughnesses have different former wear rates and close wear rates at stable stage. Under water-lubricated condition, wear rate is as low as 0.2 mg/min to 0.3 mg/min. The antiwear behavior of ceramic coating is about 5.3 times compared to aluminium alloy at dry friction. While under water-lubricated condition, the antiwear behavior of ceramic coating improves about 94 times compared to aluminium alloy. The friction coefficient of loose layer is higher than compact layer at dry friction. And there are positive correlation between wear rate and surface roughness of ceramic coating. So it can be verified that compact layer has well antiwear behavior better than loose layer.

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Chen, Fei, Hai Zhou, and Fan Xiu Lv. "Friction and Wear Behavior of Micro-Arc Oxidation Ceramic Coating on Pure Magnesium Surfaces." Advanced Materials Research 228-229 (April 2011): 661–65. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.661.

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A relatively new process called microarc oxidation (MAO), also called plasma electrolytic oxidation (PEO), has emerged as a unique technique to produce hard, thick ceramic oxide coatings on different Mg or Al alloys. The magnesium offers various possibilities of application in industry, but its poor property in corrosion resistance, wear resistance, hardness and so on, limited its application. Through microarc oxidation, ceramic coating is directly formed on the surface of pure magnesium, by which its surface property is greatly improved. In this paper, a dense ceramic oxide ceramic coating was prepared on the magnesium by microarc oxidation in a Na2SiO3-Na2WO4-KOH-Na2EDTA electrolytic solution. The surface morphology of the coating was observed by the Scanning Electron Microscope (SEM). Using the X-ray diffraction (XRD), the phase structure of the coating was analyzed. The friction and wear behavior of the micro-arc oxidation ceramic coating under dry sliding against GCr15 steel was evaluated on a ball-on-disc test rig. The results showed that the magnesium was characterized by adhesion wear and scuffing under dry sliding against the steel, while the surface micro-arc oxidation ceramic coating experienced much abated adhesion wear and scuffing under the same testing condition. The micro-arc oxidation ceramic coating showed good friction-reducing and fair antiwear ability in dry sliding against the steel.

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Enríquez, E., V. Fuertes, M. J. Cabrera, J. Seores, D. Muñoz, and J. F. Fernández. "Absence of surface flaking in hierarchical glass-ceramic coating: High impact resistant ceramic tiles." Journal of the European Ceramic Society 39, no. 14 (November 2019): 4450–56. http://dx.doi.org/10.1016/j.jeurceramsoc.2019.05.047.

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Lavorato, Gabriel C., Aldo A. Rubert, Yutao Xing, Raja Das, Joshua Robles, F. Jochen Litterst, Elisa Baggio-Saitovitch, et al. "Shell-mediated control of surface chemistry of highly stoichiometric magnetite nanoparticles." Nanoscale 12, no. 25 (2020): 13626–36. http://dx.doi.org/10.1039/d0nr02069a.

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Magnetite nanostructures gradually oxidize under environmental conditions. Here we demonstrate that a Zn-ferrite epitaxial coating protects magnetite cores from oxidation and provides a core/shell system with enhanced magnetic properties.

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Cheng, Zhen Qian, Jia Chen Liu, Cai Fen Wang, and Hai Xu. "Microwave Assisted Deposit Oxide Ceramic Coating onto Metal." Key Engineering Materials 434-435 (March 2010): 369–70. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.369.

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A new way to deposit oxide ceramic coating on the metal was prepared by Gel-casting and microwave assisted heating. The oxide ceramic coating was obtained by dipping the metal substrate whose surface carried positive charge through acid treatment to the gel slurry which was composited by oxide powder with negative charge, and then gelating, drying and heating by microwave. It was showed that it was feasible to realize coating of ceramics on metal surface through microwave heating.

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Liu, Wei Xiang. "Research on Nano-Ceramic Coatings Precision Grinding." Advanced Materials Research 748 (August 2013): 260–63. http://dx.doi.org/10.4028/www.scientific.net/amr.748.260.

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The mechanical properties and microstructure characteristics in nano-ceramic coating material determine largely their grindability, there are a variety of wear mechanisms existing in grinding process, wear resistance of nanoceramic coatings are higher than normal ceramic coating, processing zone in ceramic materials can be divided into inelastic deformation zone and elastic deformation zone. In the process of nanoceramic coatings materials removal, inelastic deformation removal and brittle removal is the coexistence, the grinding force, existing in nanostructured ceramic coatings, is bigger than it in general structure ceramic coating. In plastic deformation materials removal mode, the grinding surface roughness is low, while in brittle removal , surface grinding roughness is high , prone to grinding surface/subsurface damage.

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Wang, Yun, Weichao Wan, Junhong Mao, Lihui Tian, and Ruitao Li. "Microstructure and Wear Behavior of Plasma-Sprayed TiO2–SiAlON Ceramic Coating." Coatings 10, no. 12 (December 21, 2020): 1268. http://dx.doi.org/10.3390/coatings10121268.

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In this study, atmospheric plasma spray was employed to deposit TiO2–SiAlON ceramic coating on 316 stainless steel. The phases and microstructure of the ceramic coating were investigated. Additionally, comparative studies on the tribological performances of the substrate and the ceramic coating, under both dry and starved lubrication conditions, were carried out. The SiAlON phase was preserved, while partial TiO2 anatase was transformed to rutile phase. The wear rate of the coating was roughly 1/3 of that of the substrate under both conditions. The wear mechanisms of the ceramic coating were surface fracture and abrasive wear in both cases, and the coating under starved lubrication underwent less abrasion. The pores in the coating served as micro-reservoirs, forming an oil layer on the mating surface, and improving tribological properties during sliding.

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Zhang, Zheng Jian, Li Ying Yang, Shi Liang Zhu, and Hai Ying Yang. "Surface Modification Methods to Improve UV Inkjet Printing Performance of Ceramic." Applied Mechanics and Materials 731 (January 2015): 476–80. http://dx.doi.org/10.4028/www.scientific.net/amm.731.476.

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Using UV inkjet printing can achieve three-dimensional printing of ceramic materials, but there is low ink adhesion, easy to fall off and other issues, surface coated modification to high smoothness ceramic materials can solve the above problems [1]. In this study, the silane coupling agent, adhesive, resin and other raw materials prepared for transparent coating, which applied to the surface of the ceramics. The impact of process parameters and coating formulation on the UV print quality of the ceramic base was systematic analyzed, the result shows that the volume concentration of 10% KH550 silane coupling agent as primer, and using 20wt% 102 multipurpose plastic glue for surface coating, better ink adhesion and printing quality can be obtained.

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Geng, Sen, Zhan Shen Zheng, and Xiao Yu Hou. "Preparation of Ceramic Surface Hydrophobic Coating by Sol-Gel Method." Advanced Materials Research 750-752 (August 2013): 2121–25. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.2121.

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In this article, using the sol method successfully prepared the stabe alumina collosol, and the gel film plated on ceramic substrate. After heat treatment, with micro/nanorough double structure of alumina was constructed, and then alumina was processed by using stearic acid cyclohexane solution, reducing the surface energy. The obtained surface has good hydrophobic property. By using X-ray diffraction (XRD), scanning electron microscopy (SEM) and contact angle measurement instrument on ceramic surface was characterized microstructure and wettability of the thin film.

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Liu, Wei Xiang, Yao Wang, and Li Gao. "Research Summary on Nanostructured Ceramic Coating Grinding Surface Residual Stress." Advanced Materials Research 1004-1005 (August 2014): 1089–92. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1089.

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After precise grinding n-WC/12Co coatings with diamond wheel , there is residual stress on the surface of parts ,the paper drawn conclusions about this study,it Pointed out the contents of further study ,the direction of farther study was prospected in this study too. The interaction between the abrasive grains and the workpiece was approximately regarded as ideal small-scale indentation phenomenon, it was used to evaluate the surface quality in ceramic machined processing that formation of grinding crack and its propagation process, the material removed process and the surface defects of the ceramic grinding, the cutting model proved that although the removed material is usually brittle removal, most of the grinding energy consumption was related with plastic deformation.

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Guo, Feng, Rong Ming Liu, and Peng Fei Li. "Influence of Voltage Parameters on Formation Process of MAO Ceramic Coating on Aluminum Alloy." Advanced Materials Research 189-193 (February 2011): 931–36. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.931.

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In this paper, the influence of positive and negative voltages to the formation process of ceramic coating on aluminum alloy was studied. The result indicates that, increasing of positive or negative voltage is favorable to the thickness increase and uniformity of the ceramic coating, the thickness of ceramic coating is linear correlation to the positive electrical quantity which is relative to loaded voltages. The ceramic coating is composed of α-Al2O3, γ-Al2O3 and mullite phases, and the voltages, especially negative voltage can increase the mass fraction of α-Al2O3 phase in the outer side of ceramic coating. The effects of voltage parameters on surface morphology of ceramic coating, thickness of ceramic coating and phase composition of ceramic coating is evident, in which the positive voltage is a decisive factor and the negative voltage is an important assistant factor.

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Qian, Chao Shi, Peng Fei Li, Liang Liu, Feng Guo, and Ya Ya. "Study on Morphologies and Structures of Ceramic Coating Prepared by Micro-Arc Oxidation on TC4 Alloy." Advanced Materials Research 189-193 (February 2011): 395–99. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.395.

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In this work, the effects of concentration and mixture ratio of Ca(CH3COO)2•H2O and Na5P3O10 in electrolyte on surface morphology, surface content and atomic ratio of calcium and phosphorus elements, and phase structure of ceramic coating prepared by micro-arc oxidation（MAO）on TC4 titanium alloy were studied, a suitable formula of electrolyte for bio-modification of titanium by MAO was obtained, Ca(CH3COO)2•H2O 20 g/L and Na5P3O10 9.3 g/L. Using this electrolyte with appropriate process conditions, the ceramic coating was prepared with porosity structure and combines well with the substrate. The pores distributed equably on the surface of ceramic coating and the size of the pores was in micron order. The surface of the ceramic coating contains calcium, phosphorus elements and their atom ratio is about 1.69 which nears to that of hydroxyapatite. The ceramic coating was composed of titanium dioxide in different crystal types which have been characterized by the X-ray diffraction (XRD). The anatase titanium dioxide was a major component.

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41

Zhang, Wei, Tong Yang, and Shi Quan Liu. "Performance of a Waterproof Glass-Ceramic Coating." Applied Mechanics and Materials 670-671 (October 2014): 535–38. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.535.

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The surface of a porous silica ceramic substrate was coated with water impermeable lithium aluminosilicate glass-ceramic layer by sintering a slurry consisted of fine glass powder. The coating was 600~800 microns thick. It is demonstrated that the glass-ceramic coating consists of β-Li2Al2Si3O10 crystallites. The coated sample has an excellent water proof performance. After the coating, both the dielectric constant and loss increase. The coating protected the substrate from ablation under 1700°C.

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Gkogkas, Evangelos, Panagiota T. Dalla, Theodore E. Matikas, and Simeon Agathopoulos. "Influence of Silane Treatment of All-Ceramic Surfaces (e-Max) on the Cementation with Tooth Dentine." Key Engineering Materials 758 (November 2017): 34–38. http://dx.doi.org/10.4028/www.scientific.net/kem.758.34.

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The influence of the treatment of the surface of IPS Empress II (e-max) glass-ceramic dental material with different silane agents on the surface roughness of this glass-ceramic was evaluated. IPS Empress II (e-max) cores were treated with five different commercial silane agents used in dentistry nowadays, for several periods of time and were finally air dried. After silanization, the surfaces of the glass-ceramic cores were observed with a light profilometer, a scanning electron microscope (SEM), and an atomic force microscope (AFM). The values of surface roughness (Ra) were also measured with the light profilometer. The results showed an important effect of silane treatment applied for different periods of time, especially for prolonged treatment for 24 hours, on the surface roughness of IPS Empress II (e-max). These results can have an important impact on the deep understanding of the cementation protocols applied in modern dentistry.

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43

Aral, Ahmet, M. Gunyuz, Murat Baydogan, Nevin Gul Karaguler, Ercan Olcay, and Huseyin Cimenoglu. "Anti-Bacterial Microporous Ceramic Coating for Ti6Al4V Alloys." Key Engineering Materials 493-494 (October 2011): 916–19. http://dx.doi.org/10.4028/www.scientific.net/kem.493-494.916.

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In this study, micro porous oxide layer was formed on a Ti6Al4V alloy by the micro arc oxidation process in an electrolyte containing (CH3COO)2CaH2O + Na3PO4 with appropriate amount of silver containing agent. A wide spectrum antibiotic was also applied to the surface. Samples were subjected to antimicrobial activity tests in accordance with JIS Z 2801 standard against E.coli and the results were compared with those of original Ti6Al4V sample. First experimental results presented here showed that the micro arc oxidation process improve the antibacterial activity of Ti6Al4V alloy surface and further improvement could be obtained upon antibiotic application in addition to the micro arc oxidation process.

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Zhou, Jian Er, Qi Bing Chang, Ying Chao Dong, Xue Bing Hu, Yong Qing Wang, and Stuart Hanpshire. "Water Permeates in Ceramic Membrane Modified with Nano Inorganic Coating." Advanced Materials Research 239-242 (May 2011): 27–30. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.27.

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Membrane surface modification is the important method to decrease membrane fouling. The hydrophilic modification of ceramic membrane with nano-sized inorganic coating is prepared by the wet chemical methods. The thin nano coating is not a separating top layer but distributes uniformly on the surface of the membrane pore wall. The coating does not change the structure of the membrane pores. Therefore, water flows on not the pore wall but the nano coating surface. The results show that the water flux of the modified membrane is higher than that of the unmodified membrane despite that the mean pore size of the modified membrane decreases. The “boundary slip” is used to explain this special phenomenon. What generates the slippage? The slippage is relative with the molecular layer adhered tightly on the hydrophilic pore wall, the roughness and the surface charge of the nano coating, the interaction between the ions in water and the nano coating, et al.

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Zhang, Yong Jun, Cui Ling Zhao, Sheng Tao, Shu Gong Jia, and Zheng Chun Liu. "Study on Surface Modification Coating on High-Purity Mg." Applied Mechanics and Materials 713-715 (January 2015): 2880–88. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2880.

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Microarc oxidation (MAO) surface modification course on high-purity Mg at constant DC and the resultant ceramic coatings were investigated. MAO was the course in which the pre-existing film/coating was modified or substituted and strengthened repeatedly. SEM disclosed the inhomogeneous formation rate of ceramic coating in different micro-regions at anode surface during MAO. Three-stage behavior of MAO including pre-microarc discharge stage, transitional stage and then further modifying stage was put forward. The latter two stages proceeded under continuous discharge conditions, accompanied by intensive evolution of gas. EDS analyses indicated that the resultants of MAO consisted mainly of Mg, O and Si elements. XRD analyses revealed the dependence of phase composition on treatment time and coating layer depth.

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46

Shen, De Jiu, Wei Chao Gu, Yu Lin Wang, Guang Zhong Xing, and Philip Nash. "Surface Morphology and Discharge Channel Temperature Estimation of PEO Ceramic Coatings on Aluminum." Materials Science Forum 546-549 (May 2007): 1135–40. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1135.

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The surface roughness and morphology of the ceramic coatings fabricated on industrially pure aluminum by the plasma electrolytic oxidation (PEO) technique with a hetero-polar pulsed current ceramic synthesizing system were investigated. A model for the process was established. Based on this a formula was deduced to estimate the temperature rise rate at the corresponding locations before the plasma discharge channels have formed during the PEO process, and the channels’ temperature when the plasma discharges occur. Results show that the PEO ceramic coatings grow by an alternating coating melting and solidifying way; The coating roughness becomes greater and the plasma discharge channel population in the ceramic coatings decreases while the pores enlarge with PEO treatment time and current. With the deduced formula, the PEO alumina coating on industrially pure aluminum was taken as an example for validation of the model.

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47

LE, MINH-QUY, JIN-WO YI, and SEOCK-SAM KIM. "NUMERICAL INVESTIGATION ON CERAMIC COATINGS UNDER SPHERICAL INDENTATION WITH METALLIC INTERLAYER- PART I: UNCRACKED COATINGS." International Journal of Modern Physics B 20, no. 25n27 (October 30, 2006): 4395–400. http://dx.doi.org/10.1142/s0217979206041410.

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Radial stress distribution and plastic damage zones evolution in ceramic coating/metallic interlayer/ductile substrate systems under spherical indentation were investigated numerically by axisymmetric finite element analysis (FEA) for a typical ceramic coating deposited on carbon steel with various indenter radius-coating thickness ratios and interlayer thickness-coating thickness ratios. The results showed that the suitable metallic interlayer could improve resistance of ceramic coating systems through reducing the peak tensile radial stress on the surface and interface of ceramic coatings and plastic damage zone size in the substrate under spherical indentation.

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48

Gu, Xiao Bing, En Ze Wang, and Zheng Quan Zhang. "Fabrication of Metal Matrix Ceramic Coating and its Erosive Wear Behaviour." Applied Mechanics and Materials 79 (July 2011): 192–97. http://dx.doi.org/10.4028/www.scientific.net/amm.79.192.

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By simulating the solid-gas duplex erosive wear condition, the fabricating process of the metal matrix ceramic coating was investigated, and the properties of the ceramic coating under different fabricating conditions were studied, and the erosive wear behaviour of the ceramic coating with different volume fraction of Al2O3 particles and the mechanisms of material removal were researched and discussed. The results show that the metal matrix ceramic coating should be fabricated on the enamel coating which was prepared in advance on Q235A steel surface, and the anti-wear property of the ceramic coating containing Al2O3is better than the coating without Al2O3, and the coating with 40% volume fraction particles, eroded at velocity of 20 m/s at 45° impact angle, is the best, which is 3.67 times than that of the enamel coating.

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Pabst, Willi, and Jan Hostaša. "Thermal Conductivity of Ceramic Nanocomposites – The Phase Mixture Modeling Approach." Advances in Science and Technology 71 (October 2010): 68–73. http://dx.doi.org/10.4028/www.scientific.net/ast.71.68.

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In nanocrystalline materials the grain boundaries must be considered as regions of finite thickness with properties different from the crystalline bulk material present in the crystallite cores. Thus, dense (i.e. pore-free) single-phase nanocrystalline materials can be considered as quasi-twophase systems whose effective properties can be calculated when quantitative thickness information is available and the property value of the grain boundary phase can be reliably estimated. Similarly, dense two-phase nanocomposites may be considered as quasi-three-phase systems and their effective properties can be predicted using an analogous phase mixture modeling approach. In this contribution this is done for the thermal conductivity of alumina-zirconia nanocomposites. A twostage homogenization procedure is applied, consisting of a first step in which the alumina-zirconia composite is treated as a symmetric-cell material, and a second step in which the highly disordered grain boundary phase is treated as a matrix-phase, coating the crystallite cores. The individual averaging steps are discussed with respect to the two- and three-point bounds, and the resulting grain size dependence is compared with that of pure alumina and zirconia, and literature data.

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Chen, Ji Hua, Bin Zhang, Zhi Hao Jin, Ji Qiang Gao, and San Jun Zhao. "Effect of Surface Roughness on Matching Properties between Ceramic Framework and Coating-Glass for Dental Applications." Key Engineering Materials 336-338 (April 2007): 1603–5. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1603.

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This study was conducted to evaluate the influence of surface roughness on anchoring strength between ceramic and coating glass. Commercial Vita alpha glass-ceramic was selected as the coating glass, while the zirconia/alumina (Z/A) composite as the substrate. Anchoring strength between substrate and coating-glass was tested, and microstructure of the junction was also observed. From the experiments we can find the following results. There was significant difference in the mean strength of different surface roughness groups and HF acid-etching also had a favorable effect on matching properties. The highest amount of anchoring strength was occurred at the high scope of roughness after HF acid-etching and surface roughness will also affect the microstructure of the junction. Therefore, we can draw the conclusions that with the limit of this research, roughness will influence matching properties between ceramic substrate and coating-glass, while hydrofluoric acid etching was also suggested in the matching procedure. Testing matching properties between ceramic substrate and coating-glass should consider the influence of surface roughness.

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Journal articles on the topic 'Surface coating ceramic cores'

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