等离子喷涂法制备炭/炭复合材料硅酸钇涂层研究  

Yttrium silicate coatings for SiC coated C/C composites prepared by atmospheric plasma spraying

作　　者：黄敏[1,2] 李克智[1] 李贺军[1] 黄剑锋[1] 付前刚[1] 

机构地区：[1]西北工业大学炭/炭复合材料工程技术研究中心,陕西西安710072 [2]西安石油大学材料科学与工程学院,西安710065

出　　处：《新型炭材料》2010年第3期187-191,共5页New Carbon Materials

基　　金：国家"973"资助项目(2006CB600908)~~

摘　　要：采用等离子喷涂(Atmospheric plasma spraying,APS)法在炭/炭复合材料碳化硅(SiC)内涂层表面制备了硅酸钇涂层。分别采用XRD和SEM分析了所得涂层的微观结构,并测试了带有SiC/硅酸钇复合涂层的炭/炭复合材料试样在1500℃静态空气中的抗氧化性能。结果表明:通过调节喷涂粉料中的SiO2和Y2O3的摩尔比,可制得Y2SiO5、Y2Si2O7、Y2Si2O7/Y2SiO5和Y4Si3O12/Y2Si2O7/Y2SiO5四种不同结构的硅酸钇涂层;1500℃氧化73h后,SiC/Y4Si3O12/Y2Si2O7/Y2SiO5涂层试样的氧化失重速率相对较低,仅为1.01×10-4g.cm-.2h-1。Different yttrium silicate coatings for SiC-coated C/C composites were designed and prepared by an atmospheric plasma spray method to prevent the C/C composites from oxidation. XRD profiles showed that the coating was composed of YzSiOs, Y2Si207, and Y48i3012. SEM showed that the gradient SiC/Y4Si3Oj2/ Y2Si2OT/Y2SiO5 coating had a more compact surface than the other coatings did. Isothermal oxidation tests at 1500 ℃ in air showed that the weight loss curves of the as-prepared C/C composites showed a linear tendency with time and the weight loss rate of all coated samples increased significantly after 73 h. The coating could pro- tect the C/C composites from oxidation at 1500℃ for 73h in air with a weight losg rate of 1.01 ×10^-4 gcm^-2·h^-1. The SiC/YnSi3012/Y2Si2O7/Y25iO5 was the better coating at high temperature than other coatings.

关 键 词：炭/炭复合材料 涂层 硅酸钇 等离子喷涂 

分 类 号：TB332[一般工业技术—材料科学与工程]