共查询到20条相似文献,搜索用时 500 毫秒
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采用膏剂法及加热扩散在纯铜表面制备铜基陶瓷/渗铝复合涂层。观察分析了复合涂层的形貌和结构,并研究了该复合涂层的抗热震性能、涂层硬度、耐磨性。结果表明:纯铜膏剂法热化学反应陶瓷/渗铝复合涂层中有Na7Al3O8、Cu3TiO4、Cu9Al4等新相生成;复合涂层在700℃条件下热震次数可达40次以上;复合涂层的硬度可达83.8 HRE,耐磨性实验中,复合陶瓷涂层的相对耐磨性是基体的5.40倍;复合陶瓷涂层的黏着磨损(干摩擦)相对耐磨性是基体的5.64倍;复合陶瓷涂层的黏着磨损(油摩擦)相对耐磨性是基体的10.14倍。 相似文献
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热化学反应喷涂Al2O3基复合陶瓷涂层的制备及其性能 总被引:5,自引:0,他引:5
使用热化学反应热喷涂技术,在紫铜表面喷涂制备Al2O3基复合陶瓷涂层.利用XRD和SEM分析该复合陶瓷涂层物相组成和组织形貌,并对其热震性能、抗高温氧化性能和磨损性能进行测试.结果表明:采用热化学反应喷涂法在紫铜表面制备的陶瓷涂层内部生成陶瓷过渡相Al1.4Si0.3O2.7和Al1.9Si0.5O2.95等,在陶瓷涂层与Ni-Al过渡层间存在金属间化合物AlNi3;该复合陶瓷涂层熔化率较高,表面呈珊瑚状;涂层与紫铜基体结合牢靠,具有优异的高温抗氧化能力,其磨粒和粘着磨损比紫铜基体分别提高10倍和15倍. 相似文献
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纯铜表面热化学反应陶瓷涂层耐磨性研究 总被引:5,自引:4,他引:1
在工业纯铜表面分别用料浆法和热化学反应法制备陶瓷涂层,陶瓷涂层骨料为Al_2O_3、TiO_2和ZnO,粘接剂为钠水玻璃.研究了该涂层与基体的结合强度、涂层的抗热震性能、耐磨性,用SEM观察了涂层表面和截面的形貌.用X射线衍射法分析了涂层的相组成.结果表明,热化学反应法制备的陶瓷涂层热同化后,涂层内有NiAl_2O_4、Al_2SiO_5,新相.且这新相增加了涂层与基体的结合强度.热化学反应法制备的陶瓷涂层磨粒磨损和粘着磨损的相对耐磨性分别是基体的11.26倍和7.97倍. 相似文献
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纯铜热化学反应热喷涂陶瓷/渗铝复合涂层耐蚀性研究 总被引:1,自引:1,他引:0
采用火焰喷涂技术在铜基体表面先后喷涂渗铝层和陶瓷涂层,并加热保温,制备成铜基陶瓷/渗铝复合涂层。用XRD和SEM对涂层进行组织结构分析和形貌观察,并测试涂层的硬度、抗热震性和耐蚀性。结果表明,复合涂层中有Cu9Al4、Cu5Zn8、Cu3Ti等新相生成;渗铝层部分有γ2相(Cu9Al4)析出且涂层与基体结合紧密;复合涂层的硬度为82~87 HRE,其耐热震次数可达50次以上;复合涂层封孔后的耐酸蚀能力提高到基体的16倍,耐盐蚀能力提高到基体的25倍;极化试验表明,复合涂层抗电化学腐蚀能力显著增强,其耐蚀性能远优于纯铜渗铝层和单纯陶瓷涂层。 相似文献
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对镍基高温合金GH4169基体先采用包埋渗铝工艺制备铝化物涂层,随后在渗铝涂层表面喷烧搪瓷涂层,得到了渗铝+搪瓷复合涂层.该涂层外层由搪瓷涂层组成,厚度约为40 μm;中间层为渗铝涂层,厚度约20μm,主要为Ni2Al3相,搪瓷涂层和渗铝涂层结合良好;内层为互扩散区,厚度约为3μm.分别考察了搪瓷+渗铝复合涂层、渗铝涂... 相似文献
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在非占位涂料技术中,如何实现模样的顺利起模而不破坏涂层是发挥这一技术优势的下措施:合理的设计涂料成分,在涂料表面喷一层过渡层,采用脱模剂以及适当的模样设计,如过渡模法(又称两步法)、模样分块法,采用组芯造型和设计起模机构等. 相似文献
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Studies on plasma spraying of zircon (ZrSiO4) have been carried out by the authors as one of the candidates for an environmental barrier coating (EBC) application, and
had reported that substrate temperature is one of the most important factors to obtain crack-free and highly adhesive coating.
In this study, several amounts of yttria were added to zircon powder, and the effect of the yttria addition on the structure
and properties of the coatings were evaluated to improve the stability of the zircon coating structure at elevated temperature.
The coatings obtained were composed of yttria-stabilized zirconia (YSZ), glassy silica, whereas the one prepared from monolithic
zircon powder was composed of the metastable high temperature tetragonal phase of zirconia and glassy silica. After the heat
treatment over 1200 °C, silica and zirconia formed zircon in all coatings. However, coatings with higher amounts of yttria
exhibited lower amounts of zircon. This resulted in the less open porosity of the coating at elevated temperature. These yttria-added
coatings also showed good adhesion even after the heat treatment, while monolithic zircon coating pealed off. 相似文献
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