晶界“背脊”形貌对热障涂层热冲击寿命的影响  

Influence of grain boundary ridge on the thermal shock life of thermal barrier coatings

作　　者：牟仁德[1] 许振华[1] 王占考 黄光宏[1] 何利民[1] 

机构地区：[1]北京航空材料研究院表面工程研究所,北京100095

出　　处：《真空》2015年第4期50-54,共5页Vacuum

基　　金：航空支撑基金项目(61901100307)

摘　　要：采用化学气相沉积和电子束物理气相沉积工艺在镍基单晶高温合金基体上制备了(Ni,Pt)Al/YSZ(Yttira stabilized zirconia,YSZ)热障涂层(Thermal barrier coatings,TBCs),研究了TBCs涂层在1100℃的抗热冲击性能。结果表明,陶瓷涂层的剥落位置主要出现在热生长氧化物(Thermally grown oxide,TGO)层/粘结层的界面或者TGO层内部。试验过程中,粘结层表面晶粒晶界"背脊"形貌共存、TGO层下方孔洞形成、陶瓷层内纵向裂纹延伸和TGO层内残余应力释放均是导致TBCs涂层过早剥落失效的主要原因。Thermal barrier coating （TBC） system including of （Ni, Pt）Al/YSZ was investigated in this work. The （Ni, Pt）Al bond coat was firstly deposited on the top of Ni-based single superalloy substrate by the chemical vapor deposition （CVD）, and then YSZ as one top coat was fabricated using the electron beam-physical vapor deposition （EB-PVD）. Thermal shock behavior of the TBCs was tested at 1100℃. The results indicate that the spallation location of the TBCs occurs either at the interface of TGO layer and bond coat or inside of the TGO layer. In the process of the test, the co-existence of ridges on the surface of bond coat and grain boundary, the formation of some cavities beneath the TGO layer, the extending of vertical micro-cracks inside of ce-ramic coat and the early relaxation of residual stresses in the TGO layer are the primary factors leading to the spallation failure of （Ni, Pt）Al/YSZ TBCs.

关 键 词：热障涂层 热冲击 背脊 界面 失效 

分 类 号：TG174.453[金属学及工艺—金属表面处理]