Microstructural and mechanical properties of thermal barrier coating at 1400℃ treatment  

作　　者：Jianguo Zhu Kang Ma 

机构地区：[1]Faculty of Civil Engineering and Mechanics, Jiangsu University [2]AML, Department of Engineering Mechanics, Tsinghua University

出　　处：《Theoretical & Applied Mechanics Letters》2014年第2期47-51,共5页力学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(91216301,11172151,11232008,and 11372118);the Specialized Research of Tsinghua University Initiative Scientific Research Program

摘　　要：Abstract The mechanical properties of plasma-sprayed thermal barrier coating （TBC） play a vital role in governing their lifetime and performance. This work investigated the microstructural and mechanical properties of TBC with high tem- perature treatment at 1 400℃ by scanning electron microscopy and indentation. We calculated elastic modulus and hardness through the application of Weibull statistics analysis. The results indicate that the microstructure of ceramic coat- ing will change continuously at high temperature, and accordingly the porosity decreases due to the grain growths and crack closes. In addition, the elastic mod- ulus and hardness nonlinearly go up with the heat treatment time and go down with increasing porosity. This demonstrates that the microstructural evolution and porosity of TBC are caused by high temperature treatment, and as a result its mechanical properties are influenced.Abstract The mechanical properties of plasma-sprayed thermal barrier coating （TBC） play a vital role in governing their lifetime and performance. This work investigated the microstructural and mechanical properties of TBC with high tem- perature treatment at 1 400℃ by scanning electron microscopy and indentation. We calculated elastic modulus and hardness through the application of Weibull statistics analysis. The results indicate that the microstructure of ceramic coat- ing will change continuously at high temperature, and accordingly the porosity decreases due to the grain growths and crack closes. In addition, the elastic mod- ulus and hardness nonlinearly go up with the heat treatment time and go down with increasing porosity. This demonstrates that the microstructural evolution and porosity of TBC are caused by high temperature treatment, and as a result its mechanical properties are influenced.

关 键 词：thermal spray coating （TBC） mechanical property mircrostructure INDENTATION 

分 类 号：O343.6[理学—固体力学]