等离子喷涂和激光熔覆热障涂层隔热性能比较  

Comparison of thermal insulation capability between plasma-sprayed and laser-clad thermal barrier coatings

作　　者：王东生[1,2] 田宗军[1] 张少伍[2] 屈光[2] 沈理达[1] 黄因慧[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]铜陵学院机械工程系,铜陵244000

出　　处：《焊接学报》2012年第8期5-8,113,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(21171131;51105204);中国博士后科学基金资助项目(2012M511266);安徽省自然科学基金资助项目(1208085QE84);安徽省高等学校省级优秀青年人才基金重点资助项目(2012SQRL190ZD);江苏省博士后科研计划资助项目(1102052C)

摘　　要：采用多种方法制备不同类型的Al2O3-13%TiO2热障涂层,即等离子喷涂常规涂层、纳米结构涂层及激光熔覆纳米结构涂层.在分析三类涂层微观组织的基础上,对其隔热性能进行了比较.结果表明,即等离子喷涂常规陶瓷涂层呈典型的层状堆积特征,纳米结构涂层都为特殊的两相结构,其中部分熔化区由类似的残留纳米粒子组成,等离子喷涂纳米结构涂层的完全熔化区为片层状结构,而相应的激光熔覆涂层的完全熔化区则为细小等轴晶.在相同条件下,等离子喷涂纳米结构热障涂层具有最好的隔热性能,而激光熔覆纳米结构涂层的隔热性能要好于等离子喷涂常规涂层.Different Al2O3-13%TiO2 thermal barrier coatings(TBCs) were fabricated including the plasma-sprayed conventional coating,nanostructured coating and laser-clad nanostructured coating.Based on the analysis of microstructures of three coatings,the thermal insulation capabilities of the different coatings were comparatively studied.The results revealed that the as-sprayed conventional coating had a typical lamellar stacking characteristic.However,the nanostructured coating showed a bimodal microstructure,which was composed of fully melted regions and partially melted regions(remained nanoparticles).The fully melted regions in the plasma-sprayed nanostructured coatings were of lamellar stacking structure,while the fully melted regions in the laser-clad nanostructured coating was composed of fine equiaxed grains.The plasma-sprayed nanostructured coating displayed the best thermal barrier effect,and the thermal barrier effect of laser-clad nanostructured coating was better than that of plasma-sprayed conventional coatings.

关 键 词：等离子喷涂 激光熔覆 热障涂层 隔热性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]