矩形光束激光重熔等离子喷涂热障涂层热震试验研究  

Research on laser remelting of plasma sprayed thermal barrier coatings

作　　者：张罡[1,2] 武颖娜[1] 梁勇[1] 冯钟潮[1] 张炳春[1] 李家麟[1] 刘方军[3] 

机构地区：[1]中国科学院金属研究所 [2]沈阳工业学院材料科学与工程分院,沈阳110015 [3]高能束流加工技术重点实验室

出　　处：《激光杂志》2001年第6期65-67,共3页Laser Journal

基　　金：国防科技重点实验室基金资助 99JS50 4 1

摘　　要：在GH5 36高温合金基材上等离子喷涂NiCrA1Y/8wt.%Y2 O3 -ZrO2 热障涂层后 ,采用积分化矩形光斑进行激光重熔。组织结构分析及热震试验结果表明 :等离子喷涂与激光重熔试样的失效形式和机理不同 ,等离子喷涂试样以热震应力失效和热震应力复合TGO应力辅助作用两种形式失效。激光重熔试样以热震应力形式失效为主。能量密度较小的激光重熔试样具有高于等离子喷涂试样的热震寿命。网状裂纹及柱状晶粗化和扩展到喷涂态陶瓷层中的裂纹是激光重熔试样热震寿命降低的主要原因。A CO 2 continuous wave laser with BIZ transmissive beam integrators was used for laser remelting(LR) the surface of plasma sprayed(PS) ZrO 2-8wt pct Y 2O 3(8YSZ)/Ni22Cr10A1Y thermal barrier coatings (TBCs) on GH536 superalloy substrate.The uniform energy distribution of beam with rectangular profiles of 9mm×3mm was obtained.The thermal shock tests were conducted to both PS samples and LR samples at 1050℃.With the different failure criterions,the mechanism of failure was discussed.It was indicated that the higher laser energy input is harmful for thermal shock lifetime of LR TBCs.The thinner remelted thickness of 50μm～80μm were suggested for longest thermal shock lifetimes.

关 键 词：热障涂层 激光重熔 等离子喷涂 热震寿命 矩形积分透镜 

分 类 号：TN249[电子电信—物理电子学]