Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl11O19 Double-Ceramic Coating with Aluminum Plating

To understand the enhanced protection mechanism of CoCrNiAlY–YSZ–LaMgAl11O19 double-layer ceramic coating with aluminum plating, a finite element simulation method was used to simulate the distribution of thermal stress in the coating in all directions....

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Autores principales:	Junfei Xu, Zhiguo Wang, Shuai Hu, Yongjun Feng, Suying Hu, Yongjun Chen, Zhiwen Xie
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	double-ceramic coating arc aluminum plating stress protection mechanism finite element simulation Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/1ba51685ce104ef7afe92e0c44d8817c
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spelling	oai:doaj.org-article:1ba51685ce104ef7afe92e0c44d8817c2021-11-25T17:15:55ZUnderstanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating10.3390/coatings111113122079-6412https://doaj.org/article/1ba51685ce104ef7afe92e0c44d8817c2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1312https://doaj.org/toc/2079-6412To understand the enhanced protection mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> double-layer ceramic coating with aluminum plating, a finite element simulation method was used to simulate the distribution of thermal stress in the coating in all directions. The results show that in the air exposure of the un-aluminized coating, high temperature causes a large radial thermal stress on the surface of the LaMgAl<sub>11</sub>O<sub>19</sub> (LMA) layer, and it increases with the increase in temperature, which is the main reason for the initiation of axial cracks. After arc aluminum plating, the aluminum plating layer effectively inhibited the volume shrinkage of the coating through good adhesion to the coating and internal diffusion; the thermal stress of the coating was considerably reduced; and the CoCrNiAlY–YSZ–LMA coating had an effective enhancement and protection effect. However, there was still a certain amount of shear thermal stress inside the LMA layer, the top of the crack, and the bottom of the crack. This thermal stress caused the initiation of radial microcracks in the LMA layer, which also becomes a risk point for the failure of the aluminum coating.Junfei XuZhiguo WangShuai HuYongjun FengSuying HuYongjun ChenZhiwen XieMDPI AGarticledouble-ceramic coatingarc aluminum platingstressprotection mechanismfinite element simulationEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1312, p 1312 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	double-ceramic coating arc aluminum plating stress protection mechanism finite element simulation Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	double-ceramic coating arc aluminum plating stress protection mechanism finite element simulation Engineering (General). Civil engineering (General) TA1-2040 Junfei Xu Zhiguo Wang Shuai Hu Yongjun Feng Suying Hu Yongjun Chen Zhiwen Xie Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating
description	To understand the enhanced protection mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> double-layer ceramic coating with aluminum plating, a finite element simulation method was used to simulate the distribution of thermal stress in the coating in all directions. The results show that in the air exposure of the un-aluminized coating, high temperature causes a large radial thermal stress on the surface of the LaMgAl<sub>11</sub>O<sub>19</sub> (LMA) layer, and it increases with the increase in temperature, which is the main reason for the initiation of axial cracks. After arc aluminum plating, the aluminum plating layer effectively inhibited the volume shrinkage of the coating through good adhesion to the coating and internal diffusion; the thermal stress of the coating was considerably reduced; and the CoCrNiAlY–YSZ–LMA coating had an effective enhancement and protection effect. However, there was still a certain amount of shear thermal stress inside the LMA layer, the top of the crack, and the bottom of the crack. This thermal stress caused the initiation of radial microcracks in the LMA layer, which also becomes a risk point for the failure of the aluminum coating.
format	article
author	Junfei Xu Zhiguo Wang Shuai Hu Yongjun Feng Suying Hu Yongjun Chen Zhiwen Xie
author_facet	Junfei Xu Zhiguo Wang Shuai Hu Yongjun Feng Suying Hu Yongjun Chen Zhiwen Xie
author_sort	Junfei Xu
title	Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating
title_short	Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating
title_full	Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating
title_fullStr	Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating
title_full_unstemmed	Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating
title_sort	understanding the enhanced protective mechanism of cocrnialy–ysz–lamgal<sub>11</sub>o<sub>19</sub> double-ceramic coating with aluminum plating
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1ba51685ce104ef7afe92e0c44d8817c
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Understanding the Enhanced Protective Mechanism of CoCrNiAlY–YSZ–LaMgAl<sub>11</sub>O<sub>19</sub> Double-Ceramic Coating with Aluminum Plating

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