Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs

Abstract The penetration of CaO–MgO–Al2O3–SiO2 (CMAS) is one of the most significant factors that induce the failure of air-plasma-sprayed thermal barrier coatings (APS TBCs). The direct penetration of CMAS changes the thermal/mechanical properties of the top coat (TC) layer, which affects the therm...

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Autores principales:	Zhenwei Cai, Zifan Zhang, Yingzheng Liu, Xiaofeng Zhao, Weizhe Wang
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	CMAS non-uniform penetration TGO growth Interface stress CMAS penetration depth Interface roughness Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d8512e0d694742b295f3652fe3cd3ce1
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spelling	oai:doaj.org-article:d8512e0d694742b295f3652fe3cd3ce12021-12-05T12:03:41ZNumerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs10.1186/s10033-021-00654-41000-93452192-8258https://doaj.org/article/d8512e0d694742b295f3652fe3cd3ce12021-12-01T00:00:00Zhttps://doi.org/10.1186/s10033-021-00654-4https://doaj.org/toc/1000-9345https://doaj.org/toc/2192-8258Abstract The penetration of CaO–MgO–Al2O3–SiO2 (CMAS) is one of the most significant factors that induce the failure of air-plasma-sprayed thermal barrier coatings (APS TBCs). The direct penetration of CMAS changes the thermal/mechanical properties of the top coat (TC) layer, which affects the thermal mismatch stress behavior and the growth of thermally grown oxide (TGO) at the TC/bond coat (BC) interface, thereby resulting in a more complicated interface stress state. In the present study, a two-dimensional global model of APS TBCs with half of the TC layer penetrated by CMAS is established to investigate the effect of non-uniform CMAS penetration on the interface stress behavior. Subsequently, a local model extracted from the global model is established to investigate the effects of interface morphologies and CMAS penetration depth. The results show that non-uniform CMAS penetration causes non-uniform TGO growth in APS TBCs, which consequently causes the stress behavior to vary along the interface. Furthermore, the CMAS penetration depth imposes a significant effect on the TC/TGO interface stress behavior, whereas the interface roughness exerts a prominent effect on the stress level at the BC/TGO interface under CMAS penetration. This study reveals the mechanism associated with the effect of non-uniform CMAS penetration on the interface stress behavior in APS TBCSs.Zhenwei CaiZifan ZhangYingzheng LiuXiaofeng ZhaoWeizhe WangSpringerOpenarticleCMAS non-uniform penetrationTGO growthInterface stressCMAS penetration depthInterface roughnessOcean engineeringTC1501-1800Mechanical engineering and machineryTJ1-1570ENChinese Journal of Mechanical Engineering, Vol 34, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CMAS non-uniform penetration TGO growth Interface stress CMAS penetration depth Interface roughness Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570
spellingShingle	CMAS non-uniform penetration TGO growth Interface stress CMAS penetration depth Interface roughness Ocean engineering TC1501-1800 Mechanical engineering and machinery TJ1-1570 Zhenwei Cai Zifan Zhang Yingzheng Liu Xiaofeng Zhao Weizhe Wang Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs
description	Abstract The penetration of CaO–MgO–Al2O3–SiO2 (CMAS) is one of the most significant factors that induce the failure of air-plasma-sprayed thermal barrier coatings (APS TBCs). The direct penetration of CMAS changes the thermal/mechanical properties of the top coat (TC) layer, which affects the thermal mismatch stress behavior and the growth of thermally grown oxide (TGO) at the TC/bond coat (BC) interface, thereby resulting in a more complicated interface stress state. In the present study, a two-dimensional global model of APS TBCs with half of the TC layer penetrated by CMAS is established to investigate the effect of non-uniform CMAS penetration on the interface stress behavior. Subsequently, a local model extracted from the global model is established to investigate the effects of interface morphologies and CMAS penetration depth. The results show that non-uniform CMAS penetration causes non-uniform TGO growth in APS TBCs, which consequently causes the stress behavior to vary along the interface. Furthermore, the CMAS penetration depth imposes a significant effect on the TC/TGO interface stress behavior, whereas the interface roughness exerts a prominent effect on the stress level at the BC/TGO interface under CMAS penetration. This study reveals the mechanism associated with the effect of non-uniform CMAS penetration on the interface stress behavior in APS TBCSs.
format	article
author	Zhenwei Cai Zifan Zhang Yingzheng Liu Xiaofeng Zhao Weizhe Wang
author_facet	Zhenwei Cai Zifan Zhang Yingzheng Liu Xiaofeng Zhao Weizhe Wang
author_sort	Zhenwei Cai
title	Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs
title_short	Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs
title_full	Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs
title_fullStr	Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs
title_full_unstemmed	Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs
title_sort	numerical study on effect of non-uniform cmas penetration on tgo growth and interface stress behavior of aps tbcs
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/d8512e0d694742b295f3652fe3cd3ce1
work_keys_str_mv	AT zhenweicai numericalstudyoneffectofnonuniformcmaspenetrationontgogrowthandinterfacestressbehaviorofapstbcs AT zifanzhang numericalstudyoneffectofnonuniformcmaspenetrationontgogrowthandinterfacestressbehaviorofapstbcs AT yingzhengliu numericalstudyoneffectofnonuniformcmaspenetrationontgogrowthandinterfacestressbehaviorofapstbcs AT xiaofengzhao numericalstudyoneffectofnonuniformcmaspenetrationontgogrowthandinterfacestressbehaviorofapstbcs AT weizhewang numericalstudyoneffectofnonuniformcmaspenetrationontgogrowthandinterfacestressbehaviorofapstbcs
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Numerical Study on Effect of Non-uniform CMAS Penetration on TGO Growth and Interface Stress Behavior of APS TBCs

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