Thematische Bibliographien / Surface coating ceramic cores

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Auswahl der wissenschaftlichen Literatur zum Thema „Surface coating ceramic cores“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "Surface coating ceramic cores"

Zhou, Pengpeng, Guoqing Wu, Faheem K. Butt, Ye Tao, Jiaqi Zhao und 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, Nr. 6 (01.06.2019): 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 und Si Qing Yang. „Study on Making Ceramic Composite Steel Plate by SHS Process“. Advanced Materials Research 299-300 (Juli 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 und Zhao Hua Jiang. „Preparation of Ceramic Composite Coatings on Ti-6Al-4V Alloy by Surface Nanocrystallization/Micro-Arc Oxidation“. Key Engineering Materials 368-372 (Februar 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 und Agnieszka Guštin. „Properties of Tool Steels and Their Importance When Used in a Coated System“. Coatings 10, Nr. 3 (12.03.2020): 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 und 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, Nr. 8 (Juni 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 und Branko Škorić. „TiAlN tribological coatings prepared in industrial deposition system with different rotations“. Advanced Technologies & Materials 43, Nr. 2 (15.12.2018): 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 und Yi Liu. „Comparative Effectiveness of Multiple Laser Scanning and Conventional Techniques on Zirconia Shear Bond Strength“. Coatings 9, Nr. 7 (02.07.2019): 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 und Eglal M. R. Souaya. „Electrochemical studies on the corrosion performance of new advanced anticorrosive pigments“. Pigment & Resin Technology 46, Nr. 3 (02.05.2017): 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 und 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 (Februar 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, Nr. 01 (01.01.2021): 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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Dissertationen zum Thema "Surface coating ceramic cores"

Tirala, David. „Testování a hodnocení vlastností keramických jader pro technologii vytavitelného modelu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445169.

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Production of top quality castings for applications in energy, aerospace and medical industries by the addition of ceramic cores to investment casting presents many metallurgical and technological problems. Ceramic cores applied in investment casting are subjects to many requirements in terms of their inertness to the casted alloy and at the same time to their final removal from the casting cavity in such a way that does not damage the casting. Both of these assumptions can be achieved by applying a thin layer of inert oxide ceramic coating to the surface of a ceramic core, made out of a chemically removable – leachable oxide ceramic.

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Kashefi, Mehrdad. „PRIME surface coating : a novel method for making thick ceramic coatings“. Thesis, Nottingham Trent University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431899.

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Yang, Wen Fu. „Laser cladding surface treatment for enhancement of mechanical properties“. Thesis, Peninsula Technikon, 2003. http://hdl.handle.net/20.500.11838/1267.

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Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 2003
Systematic laser cladding experiments were performed using a mixture of a Nickel base alloy powder mixed with tungsten carbide powder (percentage contents of tungsten carbide from 10% to 40%) on EN8 steel substrate with pre-placed powder method. Laser cladding of the Nickel base alloy powder + 50% tungsten carbide powder on EN9 steel substrate was performed with powder injection method as well. A Finite Element Method for calculating the surface temperature distribution was used to help prediction of temperature distribution laser cladding results. Composition of cladding materials was designed; a sticking agent was chosen for the pre-placed powder method. Clad coatings were obtained for different process parameters for laser cladding, and a detailed study of the affects of these parameters has been carried out. The characteristic microstructure and properties of the clad layers and interface were investigated by using an optical microscope, a micro hardness tester and a makeshift wear test. A comprehensive review is presented on the dilution of the coating and the typical problems experienced with the coating substrate interface. The results show that microstructure of clad layers comprise three zones: the cladding layer, bonding zone and heat-affected zone. The results showed that tungsten carbide particles increased the hardness and wear resistance as expected. Wear resistance of laser cladding coating is 3.5 times than that of substrate. The micro hardness range of the cladding layer is from RV 981.5 to RV 1187, which is 2-3 times than that of substrate. The micro hardness varies from cladding coating to transition layer then to heat affected zone and substrate along a gradient.

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Yu, Zhou. „Surface Polymerization, Interface Structure, and Low Temperature Consolidation of Nano Ceramic Particles“. University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971379308.

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Mayanglambam, Franco. „Microstructure, tribology and surface behaviour of electroless nickel composite coating with ceramic reinforcing particles on aluminium alloy substrate“. Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707828.

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Electroless nickel composite coatings having silicon carbide (SiC) as reinforcing particles have been a surge of interest as protective layer for inferior materials by transforming the surface behaviour. In this research, phase changes during heat treatment showed NixSiy phases are independent of particles content in the coating from X-ray diffraction. Different heat treatment environments (air and vacuum) did not influence the formation of silicides. The content of SiC particles in the coating had a direct relationship with particle concentrations in the bath. Angular ceramics (SiC) had a higher degree of incorporation as compared to spherical ceramics as revealed by scanning electron microscopy. At the interface, zincating layer was found to be thermally affected and copper segregation from the bulk substrate was also detected from the elemental analysis by energy dispersive X-ray. The microhardness was controlled by specific reinforcing particles content in an effective matrix-ceramics system. Lower content of SiC in the coating results in a better wear resistance in as-deposited state during microabrasion test. Particles were seen to be pressed in the matrix. Dry sliding at elevated test temperature showed that wear behaviour had significant relationship with particle content in the coating. Propagation of microcracks was ceased by the reinforcing particles. Slight crystallisation and triboxidation were seen post-wear test. Overall, electroless nickel composite coatings developed by incorporating SiC and oxide based ceramics from the waste/surplus have unique properties potential for diverse engineering applications. However, the coating performance differs with the variation of parameters such as particle content, heat treatment environments and temperatures, sliding condition and test temperature. A well-tuned composite system is definitely a promising candidate required for surface engineering strategy. Therefore, it is highly useful to consider the aforementioned variable parameters in the decision processes for optimising an industrial process that utilises such nickel composite coatings, and vice versa.

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Deronzier, Eva. „Etude et optimisation des propriétés de transport de l’oxygène à travers des matériaux conducteurs mixtes pour la production d’énergie décarbonée“. Thesis, Limoges, 2020. http://www.theses.fr/2020LIMO0056.

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Les conducteurs mixtes ioniques et électroniques sont utilisés dans de nombreux domaines d’applications, et notamment comme matériau d’électrodes pour les piles à combustible de type SOFC (Solid Oxide Fuel Cell) ou comme matériaux membranaires pour la séparation et la production d’oxygène. Cependant, les flux de semi-perméabilité à l’oxygène obtenus par la technologie membranaire ne sont pas suffisamment importants actuellement pour répondre aux besoins industriels. L’enjeu de ces travaux de thèse a donc été de mieux comprendre la nature des mécanismes de transport de l’oxygène à travers les membranes céramiques afin d’améliorer leurs flux de semi-perméabilité à l’oxygène. Les propriétés de transport de l’oxygène de matériaux pérovkites à base de lanthane ou de baryum ont ainsi été caractérisées à partir d’un appareil original mis au point au laboratoire. Dans un deuxième temps, de nouvelles architectures de membranes ont été élaborées et caractérisées en termes de semi-perméabilité à l’oxygène
Mixed ionic and electronic conductors (MIEC) are used in numerous areas, such as cathode materials for the solid oxide fuel cells (SOFC) or as membrane materials for the oxygen gas separation. However, currently, oxygen semi-permeation fluxes produced by ceramic membranes are too low for potential industrial applications. Our study focuses on the better understanding of the oxygen transport mechanisms through the ceramic membranes in order to improve the oxygen semi-permeation fluxes through the membrane. The oxygen transport properties of lanthanum-based or barium-based perovskite materials are characterized and studied by a new and original setup. Then, new architectures of membranes are developed and their electrochemical performances are characterized

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WANG, YU-KAI, und 王昱凱. „Surface coating of Polymer Derived Silicon oxycarbonitride Ceramic for the applications of anti-hydrolysis and surface strengthening“. Thesis, 2019. http://ndltd.ncl.edu.tw/handle/byw8u4.

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碩士
南臺科技大學
機械工程系
107
The purpose of this research is to utilize liquid polysilazane macromolecule precursor for surface protection and strengthening. Liquid polysilazane macromolecule precursor can be converted into ceramic materials through high temperature treatment in inert or oxidative environment, also known as Polymer Derived Ceramic (PDC). The mechanical properties of this ceramic material in high temperature are quite stable, strong abrasive resistance, good heat dissipation and high hardness. Due to its liquid property it is easy to process for manufacturing and to utilize for the tests of anti-wear, hardness, hydrolysis resistance and other mechanical tests. Liquid polysilazane macromolecule precursor is brush-coated on the surface of the anodic aluminum alloy and controlled the formation of Silicon Oxynitride carbide, SiCNO film through different pyrolytic temperatures of 400, 500 and 600°C for achieving surface strengthening effect. The result shows in the TEM (Transmission Electron Microscope) image that SiC film can be detected on the surface of the anodic aluminum alloy substrate compactly and its thickness is about 40 nm. Silicon Oxynitride carbide ceramic penetrates the nano anodic nano-pores about 11 μm. After wear test in 2160 meters, the weight loss rate(weight loss/original weight) of SiCNO coated aluminum alloy pyrolyzed at 600°C is about 0.004% that is much lower than that of pure 7003 aluminum alloy, 0.5% and anodic aluminum alloy 0.023%. And the surface hardness of SiCNO coated aluminum alloy can achieve 6-7 GPa that is twice higher than that of anodic aluminum alloy, 3-4 GPa. The other experiment is to measure the hydrolysis of aluminum nitride surface coated by the amorphous SiCNO ceramic film. In the X-ray diffraction pattern, the crystallinities of the pure aluminum nitride and SiCNO coated aluminum nitride are completely the same. During the hydrolysis test for two weeks, the pH value of the SiCNO coated aluminum nitride still maintains stable. This result shows the direct evidence that SiCNO ceramic film has strong anti-hydrolysis ability.

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Huang, Jue-Lang, und 黃俊榮. „The Tribological Behaviour of Cr-Mo Steel after Surface Heat Treatment,Ceramic and Solid Lubrications Coating“. Thesis, 1993. http://ndltd.ncl.edu.tw/handle/55644389751835120853.

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Bosta, Mohannad Majid Saleem Al, und 浦和達. „The Infrared Emissivity of Ceramic Coating Produced by Micro-Arc Oxidation Process on Surface of 6061 Aluminium Alloy“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/27475208405542687687.

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博士
中華大學
工程科學博士學位學程
102
ABSTRACT The high emitter surfaces enhance the thermal performance of heating and cooling systems and consequently reduce the needed energy. This study devoted to the enhancement of emissivity of 6061 aluminum alloy by microarc oxidation process (MAO). We investigated the impact parameters on the low temperature IR emissivity of MAO alumina ceramic prepared at different conditions and we found that: - In general, the MAO enhanced the IR emissivity at the whole studied wavelength range (4-16 µm). - The curve of IR emissivity has two major regions: semitransparent. 4.0- 7.6 µm, and opaque region: 8.5- 16.0 µm. - The increment of processing time from 10 min to 60 min slightly enhanced the IR emissivity at the whole studied region. - A linear correlation was found between the surface roughness and the area ratio of the volcano-like microstructure. - Both curves of voltage-time and current-time have three stages correlated with the growth of MAO ceramic layer and its properties. - For the first time, the curve of IR emissivity was analyzed by dividing it into several regions according to spectra behavior and applying the multiple linear regression (MLR) to find out the effective factors. - A new model was introduced to describe the relationship between bipolar pulsing periods (BPP) and the MAO layer thickness. Also, this model was described by contours at different levels to show up the influence of variation of BPP’s on the layer thickness. - The current density slightly enhanced the IR emissivity in the semitransparent region, but did not achieve a significant change in the opaque region. - The increment of electrolyte temperature from 12.3 °C to 90.5 °C significantly changed the MAO ceramic properties from thick layer with surface microstructure of volcano-like and accumulated particles to a thin layer which has rougher surfaces covered by grainy spherical hollow bulges microstructures with more pore density and more sillimanite and cristobalite phases which enhanced the IR emissivity and widened the opaque region. Keywords: Microarc oxidation; aluminium 6061 alloy; IR emissivity; alkaline silicate electrolyte

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Chen, Jyun-Rong, und 陳俊榕. „The Study of The Stainless Steel on Surface Modification by Atmospheric Pressure Plasma and Enhancement of Adhesion with Ceramic Coating“. Thesis, 2009. http://ndltd.ncl.edu.tw/handle/40009217038055186047.

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碩士
國立高雄應用科技大學
機械與精密工程研究所
97
In this paper, we aimed to explore the surface morphology, surface elemental composition, surface roughness and the change of contact angle of stainless steel SUS304 substrate before and after surface modification of atmospheric pressure plasma. In the surface modification system of atmospheric pressure plasma, the choice of gas source ratio is that 1slm argon and 2slm nitrogen as the center gas; 9slm nitrogen as the protective gas; 12slm total gas flow. The parameters set in plasma modification are respectively different power(W), the distance between substrate and cavity resonance(mm), processing time(sec), aging time in air after plasma treatment(min) and the percentage of Oxygen(%). This surface modification mechanism in this article is the cleaning and activation function of the surface of substrates by the energy particles and free radicals produced after the dissociation of argon and nitrogen. The oxidation function with oxygen and production of a large number of oxygen containing radicals can significantly increase the surface polarity to make the surface to achieve a good hydrophilic nature. The surface morphology, surface elemental composition, surface roughness, and contact angle of substrates are respectively measured and analyzed by scanning electron microscopy(SEM), energy distribution spectrometer(EDS), atomic force microscopy(AFM), and contact angle meter. In addition, the surface coating treatment of substrate is implemented in this article. We used radio-frequency magnetron sputtering machine on the surface of stainless steel substrate to coat with silicon dioxide ceramic film, used scanning electron microscopy and energy distribution spectroscopy to observe the coating profile status and composition, and also used X-ray diffraction to analyze the coating crystal structure. Finally, we used nano-testing machine to do indentation and scratch test to measure coating hardness, elastic modulus, friction coefficient, scratch critical adhesion, and the surface morphology of quantified coating to compare the coating adhesion of the surface of substrate before and after plasma treatment.

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Bücher zum Thema "Surface coating ceramic cores"

M, Hampikian Janet, Dahotre Narendra B, Minerals, Metals and Materials Society. Surface Modification and Coatings Technologies Committee., Minerals, Metals and Materials Society. Corrosion & Environmental Effects Committee. und Minerals, Metals and Materials Society. Meeting, Hrsg. Elevated temperature coatings: science and technology III: Proceedings of a symposium sponsored by the Surface Modification and Coatings Technology Committee of the Materials Processing and Manufacturing Division (MPMD) of TMS, and by the Joint TMS/ASM Corrosion and Environmental Effects Committee of the Structural Materials Division (SMD) of TMS, held during the 1999 TMS Annual Meeting in San Diego, California, February 28-March 4, 1999. Warrendale, Penn: Minerals, Metals & Materials Society, 1999.

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Buchteile zum Thema "Surface coating ceramic cores"

Fukushima, Manabu, Seiji Nakano und Hideki Kita. „Ceramic Surface Roughness Modification Using A Polymethylsilsesquioxane and Silicon Oxycarbide Film Coating“. In Ceramic Transactions Series, 289–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144145.ch45.

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Watanabe, K., S. Fujisaki und T. Takeshige. „Recent Technological Trends of Surface Coating Refractories for CC Tundish Liners“. In Ceramic Engineering and Science Proceedings, 131–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470320310.ch11.

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Yastrebinsky, R. N., V. V. Sirota und A. V. Yastrebinskaya. „Wear Resistance of the Surface of the Structural Polyimide Composite Modified with Ceramic Corundum Coating“. In Lecture Notes in Civil Engineering, 137–42. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54652-6_21.

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Bhuyan, Saswat Kumar, und Debajit Mohapatra. „An Investigation on Surface Ceramic Coating of Compression Ignition Engine Piston Using Finite Element Analysis“. In Lecture Notes in Mechanical Engineering, 459–68. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4795-3_42.

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Chen, Ji Hua, Bin Zhang, Zhi Hao Jin, Ji Qiang Gao und San Jun Zhao. „Effect of Surface Roughness on Matching Properties between Ceramic Framework and Coating-Glass for Dental Applications“. In Key Engineering Materials, 1603–5. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1603.

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Chen, Fei, Hai Zhou, Chen Chen, Fan Xiu Lu und Fan Xiu Lu. „Study On the Corrosion Resistance Properties of the Ceramic Coating Obtained Through Microarc Oxidation on the Aluminium Alloy Surface“. In Key Engineering Materials, 1733–36. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1733.

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Dumbleton, John H., und Paul Higham. „Coating and Surface Modification“. In Metal and Ceramic Biomaterials, 119–42. CRC Press, 2018. http://dx.doi.org/10.1201/9781351074438-5.

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Al Harbi, Naif, Khaled Y. Benyounis, Lisa Looney und Joseph Stokes. „Laser Surface Modification of Ceramic Coating Materials“. In Reference Module in Materials Science and Materials Engineering. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-803581-8.11386-4.

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Güler, Onur, und Temel Varol. „Fabrication of Functionally Graded Metal and Ceramic Powders Synthesized by Electroless Deposition“. In Advanced Surface Coating Techniques for Modern Industrial Applications, 150–87. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4870-7.ch007.

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One of the most important factors in powder metallurgy is the powder properties that directly affect the final product properties. By using the functionally graded materials (FGMs) in powder metallurgy, the desired properties can be obtained by means of layers having microstructure having more than one feature in a single material structure. Similarly, by the production of functionally graded powders (FGPs), different properties can be obtained in a single powder structure and the materials that have different properties in the same structure are developed by integrating these powders with powder metallurgy. In this context, the FGMs synthesized from the FGPs produced by electroless deposition (ED) of metal or ceramic-based powder materials facilitates the production of advanced material. Therefore, the purpose of this chapter is on the fabrication of metal and ceramic-based FGPs by ED and to discuss of their advantages on the powder metallurgy parts.

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Vargas-Bernal, Rafael, und Bárbara Bermúdez-Reyes. „Advances in Low Thermal Conductivity Materials for Thermal Barrier Coatings“. In Advanced Surface Coating Techniques for Modern Industrial Applications, 88–111. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4870-7.ch004.

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One of the areas of research that continue to attract researchers worldwide is the development of thermal barrier coatings (TBCs) especially associated with the design of new ceramic topcoats with low thermal conductivity and a high coefficient of thermal expansion. The purpose of this chapter is to present the advances that have been achieved regarding ceramic topcoats in the last decades, making a historical journey that culminates with the contributions of this decade. The introduction of new crystalline structures and chemical compositions have opened the door to the real possibilities of replacing yttria-stabilized zirconia (YSZ) to ensure the optimal thermomechanical-chemical properties required by TBCs. Future research directions associated with this topic are also provided.

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Konferenzberichte zum Thema "Surface coating ceramic cores"

Marple, B. R., C. K. Jen und J. Voyer. „Ceramic-Clad Ceramic System for Ultrasonic Wave Guidance“. In ITSC 1998, herausgegeben von Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1109.

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Abstract Ceramic-clad ceramic components were developed to address the need for buffer rods capable of operating under severe conditions. The buffer rods were produced using plasma spraying to build up a 500-nm thick layer of alumina on a solid alumina rod. Both conventional plasma spraying and high power plasma spraying techniques were employed to deposit the alumina coating directly onto a pre-roughened surface. Characterization of the resulting coatings indicated a level of porosity of several percent, substantially higher than that of the dense core. The room temperature wave propagation characteristics exhibited by these clad buffer rods were significantly improved over that of the unclad components.

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Watanabe, Masanobu, Akio Sayano, Kunihiko Kinugasa, Hajime Mori und Tsuyoshi Hagiwara. „Improvement of Jet Pump Inlet Mixer in Boiling Water Reactor for Mitigating Flow-Induced Vibration and Fouling“. In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97235.

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Jet pumps in Boiling Water Reactor (BWR) have risk of damages by Flow-Induced Vibration (FIV) for when increasing the core flow rate for power uprating. Especially, the vibration by leakage flow at the slip joint between an inlet mixer and a diffuser can cause serious damage on jet pumps. It is one of the obstructive factors for power uprating. Another problem is crud deposition on the inside surface of the inlet mixer and nozzle. Thus fouling causes performance degradation of jet pumps. To reduce the risk of an FIV problem, the gap flow passage of the slip joint was modified based on the leakage-flow-induced vibration theory. The effect and characteristic of vibration suppression for the improved design was confirmed by fundamental tests that simulated the slip joint configuration. To mitigate crud deposition, a sol-gel ceramic coating process using ZrTiO4, which generates electrostatic repulsion force to crud, was developed. The effect of the coating was confirmed by experiments using test pieces. These techniques for mitigating damage due to FIV and fouling were applied to inlet mixers of jet pumps for replacement in the actual BWR plant.

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Lin, H. T., M. K. Ferber, W. Westphal und F. Macri. „Evaluation of Mechanical Reliability of Silicon Nitride Vanes After Field Tests in an Industrial Gas Turbine“. In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30629.

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This paper provides a review of recent studies undertaken to examine the mechanical and thermal stability of silicon nitride ceramic vanes with and without an oxide-based environmental barrier coating (EBC) after field tests in an industrial gas turbine. Two commercially available silicon nitride vanes (i.e., AS800 and SN282) were evaluated, where the AS800 vanes had an EBC and the SN282 vanes did not. The average temperature and pressure of gas impinging upon the vanes were approximately 1066°C and 8.9 atm, respectively. Both silicon nitride vanes were subjected to exposure time up to 1818h. Scanning electron microscopy was used to provide an insight into the changes in the microstructures of silicon nitrides and EBC arising from the environmental effects. The recession of the airfoils resulting from the volatilization of the normally protective silica layer, and /or EBC, was also measured using a coordinate measuring machine. The long-term chemical as well as structural stability of the secondary phases as well as EBC were characterized using x-ray diffraction. The surface strength of exposed airfoils was evaluated using a miniature biaxial test specimen, which was prepared by a diamond core drilling.

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Li, J. F., L. Li und F. H. Stott. „Surface modification of refractory ceramic using combined flame spraying and laser surface coating“. In ICALEO® 2003: 22nd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2003. http://dx.doi.org/10.2351/1.5060154.

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Oki, S., S. Gohda und M. Yamakawa. „Surface Morphology of Plasma Sprayed Ceramic Coatings“. In ITSC 1998, herausgegeben von Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0593.

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Abstract A novel method for characterization of microstructure of coatings is presented. Properties of plasma spray coatings are affected by their microstructure, which depends on the spraying conditions. Therefore, a detailed knowledge of microstructure is very important in order to know the coating formation mechanism and the properties of the coatings. There are many studies to characterize the microstructure of coatings. In most of those studies, the microstructures are characterized from the polished cross-section of the coatings, and the results strongly depend on the preparation methods. In this study, a new method for the characterization of coating microstructures by means of surface morphology is proposed. The distribution of shape and dimensions of splats were examined using quantitative analysis of scanning electron microscope images from the surface of the coatings. The results indicate that the surface morphology strongly depends on the spraying conditions. Keywords: characterization, coating property, splat morphology, equivalent diameter, shape factor

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Pang, X., Y. Xue, H. Jahed und B. Jiang. „Corrosion Fatigue of AZ31B Magnesium Alloy with Hard Ceramic Surface Coating“. In MS&T18. MS&T18, 2018. http://dx.doi.org/10.7449/2018mst/2018/mst_2018_754_761.

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Wang, Peipei, Li Wang, Gang Wang, Yunli Bai, Peng Wang und Zhenghang Xiao. „Effect of silicon carbide ceramic coating process on the mirror surface quality“. In Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), herausgegeben von Wenhan Jiang, Li Yang, Oltmann Riemer, Shengyi Li und Yongjian Wan. SPIE, 2016. http://dx.doi.org/10.1117/12.2242637.

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Shioiri, Tetsu, Naoki Asari, Shin Saito, Hironori Nakamuta, Mitsutaka Homma und Katsumi Suzuki. „Effect of chromium oxide coating on surface flashover characteristics of ceramic in vacuum“. In 2006 International Symposium on Discharges and Electrical Insulation in Vacuum. IEEE, 2006. http://dx.doi.org/10.1109/deiv.2006.357251.

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Gu, Le, Guangze Tang, Chuanwei Zhang, Cuini Jing und Liqin Wang. „Self-Lubricated Modification for Silicon Nitride Ceramic Ball Surface“. In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41161.

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Some thin films were prepared as solid lubricants on the surfaces of silicon nitride ceramic disk and ball. DLC film about 500–800 nm thickness was deposited on the ceramic surfaces using ion implantation and deposition technology. The surface roundness measure results, as well as 80 to 90 nm, showed that DLC film was shaped uniformly on the ceramic ball surfaces. The ball-on-disk tests showed DLC coating on silicon nitride surfaces could lead the friction coefficient to about 0.1 and endure about 7h at 1.5GPa and 30 mm/s. Ball milling technology was employed to prepare MoS2 film on the ceramic ball surfaces. The film thickness and tribological test results showed that the thin MoS2 film on the ball surfaces, which hardly changed the surface roughness, also improved their wear behaviors.

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