Tribological and Mechanical Properties of Gradient Coating on Al2O3-Based Coating Produced by Detonation Spraying Methods

IF 1.5 Q3 ENGINEERING, MECHANICAL

Advances in Tribology Pub Date : 2023-11-28 DOI:10.1155/2023/1520135

B. Rakhadilov, D. Kakimzhanov, D. Buitkenov, R. Kozhanova, L. Zhurerova, Zhuldyz Sagdoldina

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Abstract

This work is aimed at obtaining gradient coating of aluminum oxide (Al2O3) by detonation spraying. The influence of technological parameters of spraying on the formation of structure, phase composition. mechanical, and tribological characteristics of Al2O3 coatings have been investigated. It was determined that coatings obtained from the same raw powder materials under different technological conditions show different structural and phase characteristics. X-ray diffraction analysis showed that when the barrel is filled with gas mixture by 56%, the coating with the main phase α-Al2O3 is formed, and when the barrel is filled with gas mixture by 63%, the coating with the main phase γ-Al2O3, which is relatively more ductile than α-Al2O3, is formed. It is determined that the α-Al2O3 formed mainly on the surface provides good wear resistance. The bottom layer composed of γ-Al2O3 phase, which is relatively more ductile than α-Al2O3, provides good adhesion of the coating to the substrate. Tribological study showed that the coating obtained at 56% of filling shows good wear resistance compared to other samples. At 63% of filling the results of scratch test showed good adhesive strength. By varying the technological mode of detonation sputtering (56%, 53%, and 63%), Al2O3 coating with gradient structure was obtained, in which γ-Al2O3 smoothly transitions to α-Al2O3 from the substrate to the surface. The hardness of the coatings was found to increase smoothly from substrate to surface (12.4–14.2 GPa).

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用爆破喷涂法在 Al2O3 基涂层上形成梯度涂层的摩擦学和力学性能

这项工作旨在通过引爆喷涂获得氧化铝（Al2O3）的梯度涂层。研究了喷涂技术参数对 Al2O3 涂层的结构形成、相组成、机械和摩擦学特性的影响。结果表明，在不同的技术条件下，由相同的粉末原料制成的涂层具有不同的结构和相特性。X 射线衍射分析表明，当桶内充满 56% 的混合气体时，形成以 α-Al2O3 为主相的涂层；当桶内充满 63% 的混合气体时，形成以 γ-Al2O3 为主相的涂层，γ-Al2O3 比 α-Al2O3 的延展性相对更好。据测定，主要在表面形成的 α-Al2O3 具有良好的耐磨性。底层由γ-Al2O3 相组成，γ-Al2O3 相比α-Al2O3 相具有更好的延展性，因此涂层与基体之间具有良好的附着力。摩擦学研究表明，与其他样品相比，填充量为 56% 的涂层具有良好的耐磨性。填充量为 63% 时，划痕测试结果表明涂层具有良好的粘附强度。通过改变引爆溅射的技术模式（56%、53% 和 63%），获得了具有梯度结构的 Al2O3 涂层，其中从基底到表面，γ-Al2O3 平滑地过渡到 α-Al2O3。涂层的硬度从基底到表面平滑增加（12.4-14.2 GPa）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Tribology ENGINEERING, MECHANICAL-

CiteScore

5.00

自引率

0.00%

发文量

审稿时长

13 weeks