沉积温度对C-AlPO_4涂层显微结构的影响  

Influence of Temperature on the Microstructures of Cristobalite Aluminum Phosphate Coatings

作　　者：杨文冬[1] 黄剑锋[1] 曹丽云[1] 夏昌奎[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：《武汉理工大学学报》2010年第5期34-38,76,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50772063);教育部博士点基金(20070708001);陕西省自然科学基金(SJ08-ZT05);教育部新世纪优秀人才支持计划基金(NECT-06-0893);陕西科技大学研究生创新基金

摘　　要：采用水热电泳沉积法在C/C-SiC基体表面制备了方石英型磷酸铝（C-AlPO4）外涂层,借助XRD和SEM对涂层的晶相组成和显微结构进行了表征。研究了沉积温度对C-AlPO4涂层显微结构的影响,讨论了涂层的沉积动力学,进行了抗氧化性能测试。结果表明：353-393 K范围内,沉积温度对涂层的显微结构有较大影响;涂层的沉积量随着温度的升高而增加;涂层的沉积规律受C-AlPO4带电颗粒的向阴极表面扩散迁移所控制;涂层的沉积活化能为21.88kJ/mol;在1 773 K空气气氛氧化37 h后,涂层试样失重仅为0.53%。Cristobalite aluminum phosphate coatings were prepared by hydrothermal electrophoretic method on SiC coated C/C compositess.Phase compositions and microstructures of the as-prepared coatings were characterized by XRD and SEM.The influences of deposition temperature on the microstructures and the deposition kinetics of the cristobalite aluminum phosphate coatings were investigated,respectively.Oxidation resistance of the cristobalite aluminum phosphate coatings were tested.Results show that the deposition temperature plays an important role in improving the microstructure of the cristobalite aluminum phosphate coatings.The deposition mass increases with the increase of hydrothermal temperature.The deposition process of the cristobalite aluminum phosphate coatings on SiC coated C/C composite is controlled by the cristobalite aluminum phosphate electrically charged particles diffusion to the cathode,and the deposition activation energy of the cristobalite aluminum phosphate coating by the hydrothermal electrophoretic process is 21.88 kJ/mol.After oxidation at 1 773 K in the air for 37 hours,the mass loss of the coated sample is only 0.53%.

关 键 词：磷酸铝 水热电泳沉积 涂层 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]