单层厚度对Sm_2Zr_2O_7/8YSZ热障涂层残余热应力的影响  

EFFECT OF SINGLE-LAYER THICKNESS UPON RESIDUAL THERMAL STRESS IN Sm_2Zr_2O_7/8YSZ THERMAL BARRIER COATINGS

作　　者：魏媛[1] 李世显[2] 

机构地区：[1]河南工程学院材料与化学工程系,郑州450007 [2]郑州铁路职业技术学院机电工程系,郑州450007

出　　处：《中国陶瓷》2012年第10期30-33,39,共5页China Ceramics

摘　　要：采用有限单元法研究了金属粘结层厚度、热生长氧化层厚度及陶瓷层厚度对Sm2Zr2O7/8YSZ双陶瓷层热障涂层残余热应力的影响。结果表明,金属粘结层厚度为0.1mm时,涂层径向应力最小。涂层径向应力随热生长氧化层的厚度的增加而减小。当YSZ厚度在0.1～0.5mm之间时,径向热应力随YSZ厚度增加而增大,超过0.5mm后应力基本不再变化。陶瓷层最佳厚度组合是0.1mmYSZ+0.9mmSm2Zr2O7。In the current paper, the influence of thickness of bonding-layer, thermally oxide-layer and ceramic-layer on residual thermal stress in Sm2Zr2O7/8YSZ thermal barrier coatings were investigated by finite element method. Results show that 0.1mm-thickness bonding-layer lead to he lowest radial stress. Radial stress in coating decrease gradually with increase of TGO-thickness. In YSZ-thickness range 0.1-0.5mm, radial stress increases gradually, and it remains stable above 0.5ram. The most appropriate thickness combination is 0.1 mmYSZ＋0.9mmSm2Zr2O7.

关 键 词：热障涂层 有限单元法 涂层厚度 残余应力 

分 类 号：TG174.442[金属学及工艺—金属表面处理]