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Effect of Slurry Thickness on the Quality of Aluminized Coatings

Diffusion aluminum coating is crucial to protect aero-engine turbine blades from high-temperature oxidation. Slurry aluminizing, as a commonly-used coating preparation technology, has variations in the process parameters that directly affect the quality of the coating. Therefore, this paper investig...

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Autores principales: Li, Zhuoyue, Wang, Cheng, Ding, Xiangyu, Li, Xin, Yu, Jiabo, Li, Qiuliang, Qu, Yi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9571509/
https://www.ncbi.nlm.nih.gov/pubmed/36234098
http://dx.doi.org/10.3390/ma15196758
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author Li, Zhuoyue
Wang, Cheng
Ding, Xiangyu
Li, Xin
Yu, Jiabo
Li, Qiuliang
Qu, Yi
author_facet Li, Zhuoyue
Wang, Cheng
Ding, Xiangyu
Li, Xin
Yu, Jiabo
Li, Qiuliang
Qu, Yi
author_sort Li, Zhuoyue
collection PubMed
description Diffusion aluminum coating is crucial to protect aero-engine turbine blades from high-temperature oxidation. Slurry aluminizing, as a commonly-used coating preparation technology, has variations in the process parameters that directly affect the quality of the coating. Therefore, this paper investigates the effect of slurry thickness on coating quality. Different forms of aluminized coatings were obtained by coating nine DZ22B nickel-based superalloy plates of the same size with different slurry thicknesses while keeping other parameters constant. These aluminized coatings were characterized using a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS), an X-ray diffractometer (XRD), and a surface gauge. The results show that the AlNi phase dominates the matrix of the aluminized coating, and the outer layer of the coating has white dotted precipitates of Cr. As the slurry thickness increases, the coating thickness increases, and the proportion of the outer layer in the overall coating increases. In contrast, the thickness of the interdiffusion layer does not change significantly. The thicker the slurry, the higher the Al content of the coating surface. A medium-thickness slurry can form a smooth aluminizing coating with a roughness Ra < 4.5 μm surface. The combined results show that a medium-thick slurry can produce a high-quality coating.
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spelling pubmed-95715092022-10-17 Effect of Slurry Thickness on the Quality of Aluminized Coatings Li, Zhuoyue Wang, Cheng Ding, Xiangyu Li, Xin Yu, Jiabo Li, Qiuliang Qu, Yi Materials (Basel) Article Diffusion aluminum coating is crucial to protect aero-engine turbine blades from high-temperature oxidation. Slurry aluminizing, as a commonly-used coating preparation technology, has variations in the process parameters that directly affect the quality of the coating. Therefore, this paper investigates the effect of slurry thickness on coating quality. Different forms of aluminized coatings were obtained by coating nine DZ22B nickel-based superalloy plates of the same size with different slurry thicknesses while keeping other parameters constant. These aluminized coatings were characterized using a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS), an X-ray diffractometer (XRD), and a surface gauge. The results show that the AlNi phase dominates the matrix of the aluminized coating, and the outer layer of the coating has white dotted precipitates of Cr. As the slurry thickness increases, the coating thickness increases, and the proportion of the outer layer in the overall coating increases. In contrast, the thickness of the interdiffusion layer does not change significantly. The thicker the slurry, the higher the Al content of the coating surface. A medium-thickness slurry can form a smooth aluminizing coating with a roughness Ra < 4.5 μm surface. The combined results show that a medium-thick slurry can produce a high-quality coating. MDPI 2022-09-29 /pmc/articles/PMC9571509/ /pubmed/36234098 http://dx.doi.org/10.3390/ma15196758 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Zhuoyue
Wang, Cheng
Ding, Xiangyu
Li, Xin
Yu, Jiabo
Li, Qiuliang
Qu, Yi
Effect of Slurry Thickness on the Quality of Aluminized Coatings
title Effect of Slurry Thickness on the Quality of Aluminized Coatings
title_full Effect of Slurry Thickness on the Quality of Aluminized Coatings
title_fullStr Effect of Slurry Thickness on the Quality of Aluminized Coatings
title_full_unstemmed Effect of Slurry Thickness on the Quality of Aluminized Coatings
title_short Effect of Slurry Thickness on the Quality of Aluminized Coatings
title_sort effect of slurry thickness on the quality of aluminized coatings
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9571509/
https://www.ncbi.nlm.nih.gov/pubmed/36234098
http://dx.doi.org/10.3390/ma15196758
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