Influence of non-uniform feature of thermally grown oxide thickness on the local stress state and cracking behavior in TBC

doi:10.1016/j.surfcoat.2022.128607

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Influence of non-uniform feature of thermally grown oxide thickness on the local stress state and cracking behavior in TBC
	Wei, Zhi-Yuan 1; Liu, Yang 1; Cheng, Bo 2; Tahir, Adnan 1
刊名	SURFACE & COATINGS TECHNOLOGY
	2022-08-15
卷号	443
关键词	Thermal barrier coatings (TBCs) Non-uniform TGO Stress distribution Cracking behavior Numerical simulation
ISSN号	0257-8972
DOI	10.1016/j.surfcoat.2022.128607
英文摘要	The growth of thermally grown oxide (TGO) at high temperatures is the main reason for inducing the cracking near the YSZ/bond coat interface in the thermal barrier coating (TBC). The non-uniform thickening of TGO can change the local stress state and crack evolution. In this work, a TBC model including non-uniform TGO is established to explore the effect of non-uniform feature of TGO on the local cracking behavior. The continuous growth of TGO is simulated by applying a stress-free strain. The arbitrary path propagation of cracks in YSZ and TGO is realized by the XFEM method. The influences of TGO non-uniform degree and lateral growth rate on the stress variation and crack evolution are discussed. The results show that the non-uniform growth of TGO increases the local oxide film thickness and decreases the amplitude of TGO/bond coat interface, which leads to a greater crack driving force than TGO uniform growth. The increase of TGO non-uniform degree will induce longer TGO crack. The coating life predicted by the uniform TGO model is overestimated. The increase of TGO lateral growth strain leads to the improvement of YSZ crack driving force and TGO crack length, which is independent of TGO non-uniform degree. The results in this study indicate that obtaining uniform TGO with a low growth rate by process optimization will be an important option to improve the durability of TBC.
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000822945000001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158885]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China; 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Wei, Zhi-Yuan,Liu, Yang,Cheng, Bo,et al. Influence of non-uniform feature of thermally grown oxide thickness on the local stress state and cracking behavior in TBC[J]. SURFACE & COATINGS TECHNOLOGY,2022,443.
APA	Wei, Zhi-Yuan,Liu, Yang,Cheng, Bo,&Tahir, Adnan.(2022).Influence of non-uniform feature of thermally grown oxide thickness on the local stress state and cracking behavior in TBC.SURFACE & COATINGS TECHNOLOGY,443.
MLA	Wei, Zhi-Yuan,et al."Influence of non-uniform feature of thermally grown oxide thickness on the local stress state and cracking behavior in TBC".SURFACE & COATINGS TECHNOLOGY 443(2022).