Research on the stability of interface microstructure of thermal barrier coatings under cyclic thermal loading

【Author】

Jian Sun;Yingqiang Xu;Wanzhong Li;Kai Lv;

【Abstract】

Thermal barrier coating system(TBCs)can effectively improve the thermal efficiency of thermal power equipment.However,little attention has been devoted to study fatigue characteristics of TBCs under cyclic thermal loading.In this paper,according to the stress-strain accumulation theory and dissipation energy under cyclic thermal loading,the stability criteria of interface microstructure of TBCs based on static shakedown theorem and kinematic shakedown theorem were proposed respectively.Then,the influence of different interface microstructure on the stability of TBCs was analyzed through finite element methods.Finally,the simulation results were proved by thermal fatigue tests of TBCs.The results of this study demonstrate that the interface microstructure with higher curvature will lead to a lower stability and the criteria based on shakedown theorem can effectively determine the stability of TBCs under multiple cyclic thermal loading.

【Keywords】

TBCs;Research on the stability of interface microstructure of thermal barrier coatings under cyclic thermal loading;

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