等离子喷涂纳米热障涂层热震性能  

Thermal Shock Resistance of Nano-structured Thermal Barrier Coating Fabricated by Plasma Spraying

作　　者：王东生[1,2] 田宗军[2] 杨斌[1] 黄因慧[2] 

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

出　　处：《热加工工艺》2012年第4期126-129,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(59975046,50305010);江苏省自然科学基金项目(BK2004005,BK2009375);安徽省高等学校省级自然科学研究项目(KJ2011B185);铜陵学院自然科学研究项目(2010tlxy20)

摘　　要：采用等离子喷涂工艺制备常规和纳米结构ZrO2-7%Y2O3热障涂层,比较两种涂层在850℃下的热震性能,并探讨其热震失效机理。结果表明,不管是首次出现宏观裂纹(局部剥落)还是达到热震失效,纳米结构热障涂层的热震次数都明显高于相应的常规涂层。相对于常规涂层,纳米结构涂层有较好的抗热震性能。等离子喷涂常规热障涂层的热震失效形式为大面积整体剥落,而纳米结构热障涂层热震失效形式为边角局部剥落。The conventional and nano-structured ZrO2-7%Y2O3 thermal barrier coatings（TBCs） were prepared by plasma spraying.The thermal shock resistance at 850 ℃ of the conventional and nano-structured coatings were compared.Meanwhile,the thermal shock failure mechanisms of the coatings were discussed.The results show that whether it is the first time appearance of macro-cracks（local spalling） or achieve thermal shock failure,the thermal shock times of nano-structured coating are significantly higher than the corresponding conventioal coating.The nano-structured coating has better thermal shock resistance than the conventional coating.The failure mechanism of the plasma-sprayed conventional coating is large area of peeling.The failure mode of the nano-structured coating is corner spalling.

关 键 词：等离子喷涂 热障涂层 纳米结构 热震性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]