Abstract To improve the fretting wear resistance of TC6 alloy, AT40 coating and Al2O3/AT40 composite coating were prepared on TC6 respectively by atmospheric plasma spraying (APS) technology. The microstructure, composition and adhesion strength of the two coatings were studied, and the fretting wear behavior of TC6 substrate and the coatings were investigated. The results showed that, the two coatings were of lamellar stacked structures with holes and micro-cracks in stacked areas, and combined well with substrate. AT40 coating was composed of the Al2TiO5, Ti3O5 and α-Al2O3, and Al2O3/AT40 composite coating was formed by inner transition AT40 layer and outer Al2O3 layer. The inner transition AT40 layer had good compatibility with TC6 titanium alloy and Al2O3 layer, and the outer Al2O3 layer consisted of α-Al2O3 and γ-Al2O3. The two coatings significantly improved the fretting wear resistance of TC6 alloy, and the fretting wear mechanism of the two coatings was fatigue wear and slight adhesive wear.

中文翻译：

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APS AT40涂层和Al2O3/AT40复合涂层在TC6合金上的微动磨损行为

摘要 为提高TC6合金的微动磨损性能，采用大气等离子喷涂(APS)技术在TC6上分别制备了AT40涂层和Al2O3/AT40复合涂层。研究了两种涂层的微观结构、成分和结合强度，并研究了TC6基体和涂层的微动磨损行为。结果表明，两种涂层均呈层状堆叠结构，堆叠区域有孔洞和微裂纹，与基材结合良好。AT40涂层由Al2TiO5、Ti3O5和α-Al2O3组成，Al2O3/AT40复合涂层由内部过渡的AT40层和外部的Al2O3层形成。内过渡层AT40与TC6钛合金和Al2O3层具有良好的相容性，外层Al2O3由α-Al2O3和γ-Al2O3组成。