共查询到20条相似文献,搜索用时 906 毫秒
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采用热喷涂技术,在金属基体上制备陶瓷涂层,能把金属材料的特点和陶瓷材料的特点有机地结合起来,获得复合材料结构。由于这种复合材料结构具有异常优越的综合性能,使得热喷涂技术迅速从高尖领域扩展应用到能源、交通、冶金、轻纺、石化、机械等民用工业领域。首先综述了热喷涂高性能陶瓷涂层的应用前景,接着分析了陶瓷涂层及热喷涂技术的特点,然后介绍了热喷涂陶瓷涂层技术的应用领域,以及热喷涂高性能陶瓷涂层的典型应用,最后讨论了热喷涂高性能陶瓷涂层的发展潜力。 相似文献
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石油化工行业是国家节能减排重点工程之一,如果相关设备设施保温不当,不仅会造成严重的热量散失,还会对油水分离和输送等产生影响。本文系统介绍了传统的以中空玻璃微珠或陶瓷微珠为主要隔热功能填料的隔热保温涂料的保温机理、性能及其存在的问题;以 SiO2气凝胶为主要功能填料的新型隔热保温涂料研究现状及研究中的技术难点;针对不同应用环境,开发兼具防腐、防开裂、隔热保温功能的复合保温结构设计。本文为研制新型耐高温、高效水性无机隔热保温涂料的研究提供了参考方向,为隔热保温涂料在石油化工领域的工程应用提供分析。 相似文献
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《Ceramics International》2022,48(22):33245-33255
As a surface strengthening and surface modification technology of materials, liquid thermal spray technology has been used in many fields, such as wear and friction reduction, corrosion resistance, and high-temperature oxidation resistance. This article reviews the progress of liquid thermal sprayed coating in wear resistance as well as friction reduction in recent years. The influences of microstructure, composition, phase structure and mechanical properties on the tribological properties of typical coatings (including ceramic coatings and multiphase composite coatings) are investigated. The tribological properties of the coating are determined by the coating characteristics (including microstructure, porosity, mechanical properties, etc.) and the service conditions (working temperature, lubrication state, etc.). Typical ceramic wear-resistant coatings include Al2O3, YSZ, HA coatings, etc. The tribological properties of the coating can be significantly improved through process optimization and heat treatment. The comparison of nanostructured and microstructured ceramic-based coating reveals that nanostructured coating reduces wear by absorbing stress. The interaction between different constituent phases improves wear resistance and reduces wear in composite coatings. Finally, various challenges faced by liquid thermal spray are pointed out, and future research focuses are proposed. 相似文献
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KE-SHUN SHI ZENG-YING QIAN MING-SIE ZHUANG 《Journal of the American Ceramic Society》1988,71(11):924-929
The potential benefits of a thermal barrier coating on the heated side of diesel or turbine components are well documented, and this as well as other applications of ceramics in heat engines are being actively pursued. The ceramic coatings used in heat engines must be able to withstand severe thermal stress. The microstructure and properties of several sprayed coatings are described, including flame-sprayed alumina coatings, plasma-sprayed alumina coatings, and plasma-sprayed zirconia coatings. The results show that the modulus ( E ) of the coatings depends mainly on porosity and phase composition, and nonlinear stress-strain behavior is caused by the laminar grain structure of the coatings. The fracture strain of a coating is a major factor in the thermal shock resistance of that coating. 相似文献
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《Ceramics International》2019,45(14):17029-17039
Thermal barrier coatings (TBCs) provide thermal insulation to metallic components served at high temperatures. The oriented 2D pores are primarily responsible for the efficient prevention of heat flux. Thus, structural design of TBCs with higher thermal insulation requires clear understanding on the thermal conduction inside coatings. Up to now, previous analytical models to investigate the heat conduction were mainly based on the concept of thermal contact resistance. However, the related assumption was far away from the real coating microstructure. In this study, the intrinsic structural characteristics of plasma sprayed TBCs were firstly investigated. Subsequently, an analytical model based on the structural features was developed to understand the dominant effect of oriented 2D pores on heat flux inside the coatings. Results showed that the insulative ratio of 2D pores dominantly determine the effective prevention of heat flux. Moreover, effects of the microstructural parameters, including splat thickness, bonding ratio and unit size, on the total thermal resistance was discussed. Overall, the understanding of the dominant effect of 2D pores would make it possible to design new TBCs with high performance in future applications. 相似文献
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Thermal spraying of ceramics 总被引:1,自引:0,他引:1
In the last few years, the number of publications dealing with ceramic coatings has increased very rapidly. To present an overview of this field, a bibliografic review of the thermal sprayed ceramics is performed. Investigated and studied successively are the thermal spraying techniques (flame, plasma and detonation), the sprayed ceramics and the applications of these coatings. It appears that plasma spraying is the most common technique, that ceramic coatings are most often made of the metal oxides and their main application is for wear resistance. 相似文献
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因涂层材料适用范围广、基材适应性强、工艺灵活等特点,热喷涂陶瓷涂层作为一类新型耐磨涂层已经在很多领域获得成功应用。然而,现代工业发展对耐苛刻条件下严酷磨损的高性能耐磨涂层提出了越来越高的需求,如何通过材料?工艺的整体技术体系进行涂层结构的有效调控,成为涂层技术领域的重要研究课题之一。本文在简要介绍热喷涂陶瓷涂层作为耐磨涂层应用现状的基础上,提取出对涂层耐磨性具有普遍意义的层内扁平粒子间界面结合这一重要的涂层结构本质特征,明确了涂层内扁平粒子间界面强化的基本思路,阐述了基于界面同质强化和界面异质强化的两条思路进行层间结合界面强化的研究进展,以期为面向更高耐磨性能的热喷涂陶瓷涂层的材料选择、结构设计以及工艺优化提供有益参考。 相似文献
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复合型反射隔热涂料的制备与性能研究 总被引:1,自引:1,他引:0
采用红外高反射率的空心玻璃珠(BLZ)和彩色空心陶瓷珠(TCZ)制备得到复合型建筑反射隔热涂料,研究了功能性填料、乳液、颜填料及颜填料粒径配比对涂料隔热效果及耐沾污性能的影响。试验结果表明,成膜物质种类的差异对涂料隔热性能的影响较小,当纯丙乳液含量为40%时,隔热温差为14.6℃;二氧化钛能有效提高涂层反射隔热性能,采用20%的二氧化钛添加量能使隔热温差达到15℃左右;填料含量为12%时,具有良好的隔热增强效果,隔热温差为14.6℃;当m(BLZ)/m(TCZ)=1:1时,涂层隔热温差为16.5℃;耐沾污测试表明,当采用纯丙乳液,钛白、硅藻土和滑石粉比例为5:1:1,m(BLZ)/m(TCZ)=2:1时,具有良好的耐沾污性能。 相似文献