Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment

High density of the top coat of environmental barrier coatings (EBC) is important for ensuring its performance in water vapor environment, which is also significant for prolonging service lifetime of SiC<sub>f</sub>/SiC aero-engine hot components. In this work, densification of the top c...

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Autores principales:	YANG Bo, LI Guang-rong, XU Tong, YANG Guan-jun
Formato:	article
Lenguaje:	ZH
Publicado:	Journal of Materials Engineering 2021
Materias:	environmental barrier coating air plasma spray pre-heat-treatment defects-healing densification Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/af0b5b10b1074a0bac02ac47a916f802
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spelling	oai:doaj.org-article:af0b5b10b1074a0bac02ac47a916f8022021-11-12T03:01:54ZDensification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment1001-438110.11868/j.issn.1001-4381.2020.001156https://doaj.org/article/af0b5b10b1074a0bac02ac47a916f8022021-11-01T00:00:00Zhttp://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.001156https://doaj.org/toc/1001-4381High density of the top coat of environmental barrier coatings (EBC) is important for ensuring its performance in water vapor environment, which is also significant for prolonging service lifetime of SiC<sub>f</sub>/SiC aero-engine hot components. In this work, densification of the top coat of EBC was achieved by pre-heat treatment. In detail, the as-sprayed porous Yb<sub>2</sub>SiO<sub>5</sub> coatings were heat-treated at the high temperature of 1250℃ to 1450℃, which improve the density significantly. Changes in microstructure and mechanical properties during the pre-heat treatment were studied by classifying defects into different types. The processes of defects-healing were observed, and the mechanism responsible for coating densification was revealed. Results show that the porosity of as-sprayed Yb<sub>2</sub>SiO<sub>5</sub> coating is high due to the existence of three types of micro-defects, including two-dimensional (2D) inter-splat pores, 2D intra-splat cracks and three-dimensional (3D) spherical pores. During the pre-heat treatment process, 2D defects are healed to be reduced in a large amount in a short duration, while the 3D spherical pores seem unchanged. The mechanism of defects-healing in the heat treatment process is that grain growth inside the coating makes surface of the pores rough, which leads to multiple bridge-connection of 2D pores. As a result, the original continuous defects are divided into several sections and are further spheroidized. The method of pre-heat treatment for APS-EBC would make a fundamental contribution to its further engineering application.YANG BoLI Guang-rongXU TongYANG Guan-junJournal of Materials Engineeringarticleenvironmental barrier coatingair plasma spraypre-heat-treatmentdefects-healingdensificationMaterials of engineering and construction. Mechanics of materialsTA401-492ZHJournal of Materials Engineering, Vol 49, Iss 11, Pp 116-124 (2021)
institution	DOAJ
collection	DOAJ
language	ZH
topic	environmental barrier coating air plasma spray pre-heat-treatment defects-healing densification Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	environmental barrier coating air plasma spray pre-heat-treatment defects-healing densification Materials of engineering and construction. Mechanics of materials TA401-492 YANG Bo LI Guang-rong XU Tong YANG Guan-jun Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
description	High density of the top coat of environmental barrier coatings (EBC) is important for ensuring its performance in water vapor environment, which is also significant for prolonging service lifetime of SiC<sub>f</sub>/SiC aero-engine hot components. In this work, densification of the top coat of EBC was achieved by pre-heat treatment. In detail, the as-sprayed porous Yb<sub>2</sub>SiO<sub>5</sub> coatings were heat-treated at the high temperature of 1250℃ to 1450℃, which improve the density significantly. Changes in microstructure and mechanical properties during the pre-heat treatment were studied by classifying defects into different types. The processes of defects-healing were observed, and the mechanism responsible for coating densification was revealed. Results show that the porosity of as-sprayed Yb<sub>2</sub>SiO<sub>5</sub> coating is high due to the existence of three types of micro-defects, including two-dimensional (2D) inter-splat pores, 2D intra-splat cracks and three-dimensional (3D) spherical pores. During the pre-heat treatment process, 2D defects are healed to be reduced in a large amount in a short duration, while the 3D spherical pores seem unchanged. The mechanism of defects-healing in the heat treatment process is that grain growth inside the coating makes surface of the pores rough, which leads to multiple bridge-connection of 2D pores. As a result, the original continuous defects are divided into several sections and are further spheroidized. The method of pre-heat treatment for APS-EBC would make a fundamental contribution to its further engineering application.
format	article
author	YANG Bo LI Guang-rong XU Tong YANG Guan-jun
author_facet	YANG Bo LI Guang-rong XU Tong YANG Guan-jun
author_sort	YANG Bo
title	Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
title_short	Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
title_full	Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
title_fullStr	Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
title_full_unstemmed	Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
title_sort	densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment
publisher	Journal of Materials Engineering
publishDate	2021
url	https://doaj.org/article/af0b5b10b1074a0bac02ac47a916f802
work_keys_str_mv	AT yangbo densificationmethodofairplasmasprayedenvironmentalbarriercoatingsachievedbypreheattreatment AT liguangrong densificationmethodofairplasmasprayedenvironmentalbarriercoatingsachievedbypreheattreatment AT xutong densificationmethodofairplasmasprayedenvironmentalbarriercoatingsachievedbypreheattreatment AT yangguanjun densificationmethodofairplasmasprayedenvironmentalbarriercoatingsachievedbypreheattreatment
_version_	1718431309715472384

Densification method of air-plasma-sprayed environmental barrier coatings achieved by pre-heat treatment

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