NDLI: Comparative Study of Structures and Properties of Detonation Coatings with $α-Al_{2}O_{3}$ and $γ-Al_{2}O_{3}$ Main Phases

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Comparative Study of Structures and Properties of Detonation Coatings with $α-Al_{2}O_{3}$ and $γ-Al_{2}O_{3}$ Main Phases

Content Provider	MDPI
Author	Rakhadilov, Bauyrzhan Kakimzhanov, Dauir Baizhan, Daryn Muslimanova, Gulnar Pazylbek, Sapargali Zhurerova, Laila
Copyright Year	2021
Abstract	This study is aimed at obtaining a coating of aluminum oxide containing α-Al₂O₃ as the main phase by detonation spraying, as well as a comparative study of the structural, tribological and mechanical properties of coatings with the main phases of α-Al₂O₃ and γ-Al₂O₃. It was experimentally revealed for the first time that the use of propane as a combustible gas and the optimization of the technological regime of detonation spraying leads to the formation of an aluminum oxide coating containing α-Al₂O₃ as the main phase. Tribological tests have shown that the coating with the main phase of α-Al₂O₃ has a low value of wear volume and coefficient of friction in comparison with the coating with the main phase of γ-Al₂O₃. It was also determined that the microhardness of the coating with the main phase of α-Al₂O₃ is 25% higher than that of the coatings with the main phase of γ-Al₂O₃. Erosion resistance tests have shown (evaluated by weight loss) that the coating with α-Al₂O₃ phase is erosion-resistant compared to the coating with γ-Al₂O₃ (seen by erosion craters). However, the coating with the main phase of γ-Al₂O₃ has a high value of adhesion strength, which is 2 times higher than that of the coating with the main phase of α-Al₂O₃. As the destruction of coatings by the primary phase, α-Al₂O₃ began at low loads than the coating with the main phase γ-Al₂O₃. The results obtained provide the prerequisites for the creation of wear-resistant, hard and durable layered coatings, in which the lower layer has the main phase of γ-Al₂O₃, and the upper layer has the main phase of α-Al₂O₃.
Starting Page	1566
e-ISSN	20796412
DOI	10.3390/coatings11121566
Journal	Coatings
Issue Number	12
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-12-20
Access Restriction	Open
Subject Keyword	Coatings Coatings and Films Gas Detonation Spraying Aluminum Oxide Coating Γ-al2o3 Α-al2o3 Wear Resistance Hardness
Content Type	Text
Resource Type	Article

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