Promoted low-temperature plasma nitriding for improving wear performance of arc-deposited ceramic coatings on Ti6Al4V alloy via shot peening pretreatment
Promoted low-temperature plasma nitriding for improving wear performance of arc-deposited ceramic coatings on Ti6Al4V alloy via shot peening pretreatment
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DOI：
10.1016/j.jmrt.2022.06.067
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发表时间：
2022-06-28
影响因子：
6.4
通讯作者：
Chen, Wanglin
中科院分区：
文献类型：
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作者：
Xiao, Hui;Liu, Xuanyu;Chen, Wanglin
为提高Ti6Al4V合金的耐磨性，提出了喷丸处理(SP)、低温离子渗氮(PN)和电弧沉积(AD)相结合的方法。采用SP预处理法实现了Ti6Al4V合金的低温快速渗氮，获得了理想的渗氮层。SP处理产生的高密度结构缺陷促进了低温渗氮动力学。渗氮层由最外层的TiN/Ti2N化合物层和内扩散层组成，呈扩散型硬度分布，有利于提高结合强度和承载能力。此外，涂层结合强度的提高与TiN/Ti2N化合物密切相关，TiN/Ti2N化合物为AD涂层提供了异质形核中心，涂层硬度可达3100HV左右。与单一的AD或PN-AD相比，SP-PN-AD涂层的高承载能力和结合强度确保了其优异的耐磨性，特别是在强烈的磨损载荷条件下。这项工作为钛合金的表面硬化提供了新的视角。(C)2022年提交人。爱思唯尔出版公司(Elsevier B.V.)
In the present work, the combination of shot peening (SP), low-temperature plasma nitriding (PN) and arc deposition (AD) is proposed to improve the wear performance of Ti6Al4V alloy. The low-temperature rapid nitriding of Ti6Al4V alloy was realized by SP pretreatment to obtain a desired nitrided interlayer. The high-density structural defects produced by SP pretreatment promote the nitriding kinetics at low temperature. The nitrided interlayer consists of an outermost TiN/Ti2N compound layer and an inner diffusion layer, showing a diffusion-typed hardness-profile, which is beneficial for the enhancing of adhesion strength and load-bearing capacity. Moreover, the improvement of adhesion strength is associated closely with TiN/Ti2N compounds which can provide heterogeneous nucleation sites for AD coating with a high hardness of about 3100 HV. The high bearing-load capacity and adhesion strength can ensure the excellent wear resistance of SP-PN-AD-coated sample when compared to single AD or PN-AD samples, especially under intensive wear load conditions. The present work provides a new insight into surface hardening of Ti alloys. (C) 2022 The Authors. Published by Elsevier B.V.