GH220/Ti──N/CoCrAlTaY/Al三层复合涂层的界面稳定性及其自分层行为研究  

INTERFACIAL STABILITY AND SELF SCALING BEHAVIOR OF A NEW MULTI LAYER GH220/Ti N CoCrAlTaY/Al PROTECTIVE COATING

作　　者：王家军[1] 杨志刚[1] 李春明[1] 郑燕康[1] 叶锐曾[2] 

机构地区：[1]清华大学材料科学与工程系 [2]北京科技大学材料科学与工程系

出　　处：《航空学报》1997年第1期57-61,共5页Acta Aeronautica et Astronautica Sinica

摘　　要：ＧＨ２２０／Ｔｉ－Ｎ／ＣｏＣｒＡｌＴａＹ／Ａｌ三层复合防护涂层经扩散退火后，各层间结合较好，Ｔｉ－Ｎ组织稳定，Ａｌ全部扩散进入ＣｏＣｒＡｌＴａＹ内部，形成β－ＣｏＡｌ相。１０００℃时效试验发现，Ａｌ内扩散导致ＣｏＣｒＡｌＴａＹ分层，形成７个亚层（不包括氧化膜及Ｔｉ－Ｎ膜），其中包括３个富Ｔａ层、２个高Ａｌ及２个正常ＣｏＣｒＡｌＴａＹ层。各亚层间界面随时效时间延长而趋于平直、连续、完整。在一些亚层内侧观察到Ｋｉｒｋｅｎｄａｌ空穴，其形成与元素的外扩散有关。分析了ＧＨ２２０／Ｔｉ－Ｎ界面扩散区的形成原因。Experimental results show that, after being diffusion annealed, each layer in the Ti N/CoCrAlTaY/Al multi layer composite coating is firmly bonded with the neighboring ones, the microstructure of Ti N film is stable, and that Al has completely diffused into the CoCrAlTaY, giving rise to the formation β CoAl compound. It was discovered that after being aged at 1000℃, the CoCrAlTaY layer will self divided into 7 sub layers (not including the outer oxide film and Ti N layer), 3 of which are enriched with Ta, 2 of which contain more Al, and 2 of which are normal CoCrAlTaY sub layers. With the prolonging of aging time, the boundaries between different sub layers tend to be more straight, continuous, and integral. Kirkendall vacancies were observed on the inner side of some sub layer, indicating the diffusion of atoms towards the outer side. The formation mechanism of Ta enriched sub layer and the diffusion zone between GH220/Ti N have been interpreted.

关 键 词：包覆涂层 复合涂层 空穴 自分层 航空涂层 

分 类 号：V261.933[航空宇航科学与技术—航空宇航制造工程]