沉积温度对水热电泳沉积硅酸锆涂层显微结构和性能的影响  

Influence of Deposition Temperature on Microstructure of Zirconium Silicate Coating Prepared by Hydrothermal Electrophoretic Deposition Process

作　　者：刘佳[1] 曹丽云[1] 黄剑锋[1] 辛宇[1] 吴建鹏[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《航空材料学报》2011年第6期30-35,共6页Journal of Aeronautical Materials

基　　金：国家自然科学基金(51072108);陕西省教育厅科研计划项目资助基金(2010JK444);陕西科技大学研究生创新基金

摘　　要：以硅酸锆粉体为原料,异丙醇为溶剂,采用水热电泳沉积法在C/C-SiC复合材料基体表面制备了硅酸锆外涂层。通过X射线衍射(XRD)、扫描电子显微镜(SEM)对涂层的晶相结构和微观形貌进行表征。研究了沉积温度对硅酸锆涂层沉积量及显微结构的影响,及不同沉积温度下涂层的沉积动力学,同时测试了涂层的抗氧化性能。结果表明:在353～413K范围内,水热沉积温度对涂层的显微结构有较大影响;涂层的沉积量随温度升高而增加;涂层的沉积规律受硅酸锆带电粒子扩散迁移所控制;涂层的沉积活化能为25.45kJ/mol;所制备的涂层试样在空气中氧化25h后,失重率小于2%。Zirconium silicate（ZrSiO4） coating was deposited on the surface of C/C-SiC composite by a hydrothermal electrophoretic process.The phase composition and microstructure of the prepared multi-layer coating were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The influence of deposition temperature on the microstructure of ZrSiO4 coating was investigated.The isothermal oxidation performances of the coating were tested.Results show that the deposition temperature plays an important role in improving the microstructure of zirconium silicate coating.The deposition amount of coating increases with the increase of deposition temperature.The coating deposition rate is controlled by the diffusion rate of charged Zirconium silicate particles.The deposition activation energy of zirconium silicate coating is calculated to be 25.45 kJ/mol during hydrothermal electrophoretic process.After 25h oxidation,the weight loss of C/C-SiC-zirconium silicate coating of the coated sample is less than 2%.

关 键 词：硅酸锆 水热电泳沉积 碳/碳复合材料 沉积动力学 

分 类 号：TB332[一般工业技术—材料科学与工程]