超音速火焰喷涂MCrAlY粘结层对热障涂层热震性能的影响

材料热处理学报, 2010, 31(11): 155-160.

超音速火焰喷涂MCrAlY粘结层对热障涂层热震性能的影响

陈亚军 ^1, , 林晓聘 ^2, , 王志平 ^3, , 王立君 ^4, , 董允 ^5,

1.天津大学材料科学与工程学院,天津,300072;中国民航大学中欧航空工程师学院,天津,300300

2.东北大学秦皇岛分校材料科学与工程学院,河北,秦皇岛,066004

3.中国民航大学中欧航空工程师学院,天津,300300

4.天津大学材料科学与工程学院,天津,300072

5.东北大学秦皇岛分校材料科学与工程学院,河北,秦皇岛,066004

基金项目: 国家自然科学基金(60879018)

关键词：超音速火焰喷涂 , 等离子喷涂 , 热障涂层 , 热生长氧化物 , 热循环

Effects of HVOF bond coat on thermal cyclic failure lifetime of thermal barrier coating

分别采用超音速火焰喷涂技术(HVOF)和等离子喷涂技术(APS)在高温合金GH99上制备MCrAIY粘结层(BC),对比研究了HVOF和APS喷涂BC对热障涂层(TBC)热震性能的影响.结果表明:APS喷涂BC界面不平整,起伏较大,而HVOF喷涂BC界面较为平整.经200次热循环后,APS喷涂TBC部分陶瓷层(TC)出现剥落,而HVOF喷涂TBC仅出现细小的微裂纹,生成的热生长氧化物(TGO)比较厚.APS喷涂TBC经过350次热循环后,涂层出现大面积剥离现象.而HVOF热障涂层直到热震430次后,才出现涂层剥落现象.拉曼光谱(RFS)残余应力分析表明,HVOF热障涂层残余应力随热循环次数的增加而增大,热震350次后APS热障涂层残余应力为650MPa,而HVOF热障涂层热震400次后其应力值仅为571 MPa.可知,HVOF显著地提高了TBC的热震性能.

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