共查询到19条相似文献,搜索用时 82 毫秒
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热喷涂纳米涂层制备方法及材料的研究现状和展望 总被引:5,自引:0,他引:5
综述了热喷涂纳米涂层的制备方法现状及所用材料的发展情况,介绍了溶液等离子喷涂(SPS)、冷气动力喷涂(CGDS)、高速火焰喷涂(HVOF)技术制备纳米涂层的优势、纳米粉末材料的制备方法及发展趋势,指出纳米涂层制备的主要关键在于解决纳米粉末的输送技术和涂层制备过程中抑制纳米颗粒的长大趋势。纳米涂层的研究对推动热喷涂技术应用有着十分重要的作用。 相似文献
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介绍了热喷涂制备纳米涂层的方法,主要是间接喷涂法和直接喷涂法.并简要介绍了国内外研究动态和水平,分析了热喷涂制备纳米涂层所面临的一些难题及现有的解决方法和措施,展望了热喷涂技术在未来制备纳米涂层方面的发展. 相似文献
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采用热喷涂技术进行涂层材料、涂层结构的复合设计,将结构与性能完全不同的材料有机地组合在一起,可研制出性能优越且多种功能并存的新型涂层。如:水润济状态下的运动摩擦副表面抗蚀、耐磨、减摩陶瓷涂层;新一代纳米氧化皓高温热障涂层;抗高温隔热烧蚀梯度复合结构涂层;高温管道表面阻尼减振降噪、隔热复合涂层以及高温热辐射涂层等。研究表明:表面工程技术对传统材料进行表面改性并能赋予其新的特种功能是完全可行的。 相似文献
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Nanostructured WC-Co coatings were produced with Atmospheric Plasma Spraying (APS) and Low Pressure Plasma Spraying (LPPS). Microstructure characteristics and phase compositions of the coatings were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The microstructure compositions were analyzed with EDS. During APS deposition the existence of oxygen causes the decarburization of the coating, and the coating was composed of melted area and the WC/12Co powder. Besides WC phase, there was W2C phase. However in the coating deposited by LPPS the content of oxygen was so low that there were a limit degradation of the WC/12Co powder. The coatings were made up of compact block and loosen porosity area. There were large quantities of nanostructure WC grains and a small quantity of microstructure WC grains presented in the coating. Besides WC phase, a little W2C and WC1-x or Co6W6C phases occured. Consideration of the characteristics of the highly porous, spherical-shell morphology of nano-WC/12Co power, heterogeneous melting and localized superheating of the power were two main factors which caused the microstructure and phase composition of nano-WC-Co coatings. 相似文献
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YPSZ纳米结构热喷涂粉末材料工艺优化研究 总被引:2,自引:0,他引:2
热等离子体喷涂制备YPSZ纳米结构涂层必须首先进行YPSZ纳米结构粉末材料的研究.本文采用浆料分散、喷雾干燥、热处理的方法制备适于热等离子体喷涂纳米结构涂层的球形、致密YPSZ纳米结构粉末材料.测定浆料的粘度、沉降高度曲线表征浆料的均匀性和稳定性,利用扫描电子显微镜、x射线衍射分析对粉末材料的微观组织及相结构进行分析,利用热重/差热分析对热处理工艺过程进行分析.结果表明:采用优化的工艺成功制备出球形、结构均匀、致密的YPSZ纳米结构粉末材料,适于热喷涂制备YPSZ纳米结构涂层. 相似文献
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Nanostructured FeS-SiC coating was deposited by atmospheric plasma spraying (APS). The microstructure and phase composition of the coating were characterized with SEM and XRD, respectively. In addition, the size distribution of the reconstituted powders and the porosity of the coating have been measured. It was found that the reconstitiuted powers with sizes in the range of 20 to 80 μm had excellent flowability and were suitable for plasma spraying process. The assprayed FeS-SiC composite coating exhibited a bimodal distribution with small grains (30~80nm) and large grains (100~200nm). The coating was mainly composed of FeS and SiC, a small quantity of Fe1-x S and oxide were also found. The porosity of the coating was approximately 19 %. 相似文献
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等离子喷涂氧化锆纳米涂层显微结构研究 总被引:27,自引:0,他引:27
利用大气等离子喷涂(APS)技术,在不锈钢基体上制备了氧化锆纳米结构涂层.运用XRD、SEM与TEM等分析手段对喷涂用粉末原料和涂层的显微结构、物相组成进行了观察和确定.实验结果表明,纳米氧化锆粉末经喷雾造粒后的颗粒粒径主要分布在15~40μm之间,流动性好,适合于等离子喷涂用.等离子喷涂氧化锆纳米涂层颗粒分布在60~120nm之间,晶粒发育良好.涂层物相由四方和立方相氧化锆所组成.氧化锆纳米涂层的气孔率约为7%,结合强度为45MPa。 相似文献
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