ZrSi2-SiC/SiC Anti-Oxidant Coatings Prepared on Graphite Spheres by Two-Step Pack Cementation Process

摘要：

　　A ZrSi2-SiC/SiC double layer was fabricated on the surface of graphite spheres by two-step pack cementation with zirconium, silicon, and graphite powders as mainly raw materials.The microstructure, phase, oxidation behavior, and thermal shock resistance of the ZrSi2-SiC/SiC composite coatings were studied.The results show that the outer coating is composed of ZrSi2 and SiC and the inner coating is composed of SiC, of which the thickness is 450 μm.Isothermal oxidation test was conducted in air at 1773 K for 20 h and a weight increase of 1.69% were recorded.After 10 times of thermal shock tests between 1473 K and room temperature, the weight of the coated specimens decreased by only 1.14%.The excellent oxidation resistance is due to the production of SiO2 and ZrSiO4 in the process of the oxidation of SiC and ZrSi2, forming a glass phase that can effectively prevent further oxidation.

关键词： Graphite Spheres Pack cementation ZrSi2 ZrSiO4 Anti-oxidation Glass film

作者: Zu-jie Zheng Ping Zhou Hong-sheng Zhao Zi-qiang Li Xiao-xue Liu Kai-hong Zhang Bing Liu

作者单位: Institute of Nuclear and New Energy Technology, Tsinghua University, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Beijing 100084, China

会议类型: 国际会议

会议名称: The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)

会议地点: 重庆

会议语种:英文

页码: 953-958

在线出版日期: 2016-07-25（万方平台首次上网日期，不代表论文的发表时间）