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激光重熔对等离子喷涂热障涂层冲蚀行为影响
王东生1,2, 田宗军2, 王泾文1, 沈理达2, 黄因慧2
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, 南京 210016
摘要:
研究了等离子喷涂和激光重熔ZrO2-7% Y2O3热障涂层的微观结构,同时考察了两种涂层的抗冲蚀性能,并探讨了其冲蚀破坏机理.试验发现,等离子喷涂热障陶瓷涂层呈典型的层状堆积特征;经过激光重熔处理后,涂层表面形成了沿热流方向生长的柱状晶重熔区;相对于等离子喷涂试样,激光重熔涂层有较好的抗冲蚀性能;不管等离子喷涂试样还是激光重熔试样都表现为典型的脆性冲蚀特性.结果表明,等离子喷涂层的冲蚀磨损以片层状脱落为主,同时有一定程度的脆性陶瓷颗粒破碎;而激光重熔试样以近表面的裂纹萌生和扩展,最终导致重熔层晶粒破碎、剥离为主.
关键词:  激光重熔  等离子喷涂  热障涂层  抗冲蚀性能  冲蚀破坏机理
DOI:
分类号:
基金项目:国家自然科学基金资助项目(59975046,50305010);江苏省自然科学基金资助项目(BK2004005,BK2009375);铜陵学院引进人才科研启动基金资助项目
Effect of laser remelting on erosion behavior of plasma-sprayed thermal barrier coatings
WANG Dongsheng1,2, TIAN Zongjun2, WANG Jingwen1, SHEN Lida2, HUANG Yinhui2
1.Department of Mechanical Engineering, Tongling College, Tongling 244000, China;2.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract:
The ZrO2-7% Y2O3 thermal barrier coatings fabricated by plasma spraying on TiAl alloy surface were remelted by laser.The microstructures of the plasma-sprayed and laser-remelted coatings were compared by using scanning electron microscopy(SEM).Meanwhile,the erosion experiments of the coatings were carried out and the erosion failure mechanisms were discussed.The results show that the as-sprayed ceramic coating has a typical lamellar stacking characteristic.However,the laser-remelted coating exhibits a compact remelted zone which is composed of column-like grains along the direction of the heat current.The laser-remelted coating has better erosion resistance than the plasma-sprayed coating.Both as-sprayed and laser-remelted coatings show a brittleness erosion mechanism.Owing to the limited bonding at the interfaces between lamellar,the spalling of ceramic particles from the lamellar interface may be mainly responsible for the erosion of the as-sprayed coating;in contrast,cracking occurs within region near the surface of the laser-remelted ceramic coating which makes erosion occur by removal of these small blocks.
Key words:  laser remelting  plasma spraying  thermal barrier coatings  erosion resistance  failure mechanism