Comparative study of structures and properties of detonation coatings with α-al2o3 and γ-al2o3 main phases


Rakhadilov B. Kakimzhanov D. Baizhan D. Muslimanova G. Pazylbek S. Zhurerova L.
December 2021MDPI

Coatings
2021#11Issue 12

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.

Aluminum oxide coating , Gas detonation spraying , Hardness , Wear resistance , α-Al2O3 , γ-Al2O3

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Research Center Surface Engineering and Tribology, Sarsen Amanzholov East Kazakhstan University, Ust-Kamenogorsk, 070000, Kazakhstan
PlasmaScience LLP, Ust-Kamenogorsk, 070010, Kazakhstan
D. Serikbayev East, Kazakhstan Technical University, Ust-Kamenogorsk, 070000, Kazakhstan
Institute for Composite Materials, Ust-Kamenogorsk, 070010, Kazakhstan
Department of Physics, South Kazakhstan State Pedagogical University, Shymkent, 160005, Kazakhstan

Research Center Surface Engineering and Tribology
PlasmaScience LLP
D. Serikbayev East
Institute for Composite Materials
Department of Physics

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