等离子喷涂纳米结构A1_2O_3+13%TiO_2涂层的热震失效机理  

Thermal Shock Failure Mechanism of Plasma Sprayed Nanostructured Al_2O_3–13%TiO_2 Coating

作　　者：魏振毅[1] 李强[1] 叶辉[1] 赵小健[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350108

出　　处：《中国表面工程》2009年第3期38-42,48,共6页China Surface Engineering

基　　金：福建省科技厅科技计划重点项目(2005H031)

摘　　要：研究了纳米结构A12O3+13%TiO2(AT13)陶瓷涂层的微观组织,并对其进行热震试验,分析涂层热震前后组织结构的变化,并结合交流阻抗法研究了涂层的热震失效机理。结果表明,陶瓷涂层存在1.02%的通孔,热震过程中氧穿越通孔,使粘结层/陶瓷层界面生成一层氧化物。粘结层/基底界面的氧化物主要为疏松的氧化铝,随着热震次数增多,氧化物层厚度增大。纳米结构AT13陶瓷涂层热震失效发生在粘结层/陶瓷层界面。The microstructure of nanostructured Al2O3＋13%TiO2（AT13） ceramic coating was studied in this paper, the change of the microstructure of the coating after thermal shock was analyzed, and the thermal shock failure mechanism was studied combining with AC impedance spectroscopy. The result shows that the connected porosity of nanostructured ceramic coating is 1.02% and the oxygen goes through the connected pore and the oxide forms at the interface between ceramic top coating and bond coating duing the thermal shock process. Most of the oxide at the interface between ceramic top coating and bond coating is mushy alumina, and the thickness of the oxide increases with the thermal shock numbers. Thermal shock failure of the nanostructured AT13 ceramic coatings occurs at the interface between bond coating and ceramic top coating.

关 键 词：等离子喷涂 纳米结构涂层 热震 失效机理 

分 类 号：TG174.442[金属学及工艺—金属表面处理]