Crack development behavior in thermally sprayed anti-oxidation coating under repeated thermal-oxygen coupling environment

被引：16

作者：

Hu, Dou ^{[1
]}

Fu, Qiangang ^{[1
]}

Zhou, Lei ^{[1
]}

Liu, Bing ^{[1
]}

Sun, Jia ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Shaanxi Key Lab Fiber Reinforced Light Weight Com, Xian 710072, Shaanxi, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2021年 / 47卷 / 11期

基金：

中国国家自然科学基金;

关键词：

C; C composites; Thermally sprayed coating; Oxidation; Crack development; Finite element analysis (FEA); OXIDATION PROTECTIVE-COATINGS; C/C COMPOSITES; CARBON/CARBON COMPOSITES; ABLATION RESISTANCE; GRAPHITE MATERIALS; MICROSTRUCTURE; MOSI2;

D O I：

10.1016/j.ceramint.2021.02.098

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The crack development behavior in thermally sprayed anti-oxidation coating was investigated after long-term and short-term oxidation with repeated thermal cycles from 1500 ?C to room temperature. According to the distribution characteristics, the formed cracks can be divided into three types: type-A cracks with multidirectional features, type-B cracks originated from the inner interface bulges and type-C cracks initiating at surface oxide layer. Based on the analytical math models (blunt crack model and interface roughness model), the maximum stress at different positions was evaluated from the perspective of inner interface roughness, uneven oxide film, original microcracks and gathering micropores. The original vertical type-A cracks are most dangerous due to the highest crack tip stress. However, the micropore distribution or appropriate interface may promote transformation of vertical type-A cracks to less dangerous horizontal type-A cracks. This study on crack development behavior provides a fundamental insight and further avenues to optimize the composition and structure of thermally sprayed ceramic coating.

引用

页码：15328 / 15336

页数：9

共 45 条

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