Microstructure and Tribological Behavior of a TiO2/hBN Composite Ceramic Coating Formed via Micro-arc Oxidation of Ti-6Al-4V Alloy
Microstructure and Tribological Behavior of a TiO2/hBN Composite Ceramic Coating Formed via Micro-arc Oxidation of Ti-6Al-4V Alloy
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DOI：
10.1016/j.jmst.2016.06.015
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发表时间：
2016-10-01
影响因子：
10.9
通讯作者：
Zhang, Mengmeng
中科院分区：
文献类型：
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作者：
Ao, Ni;Liu, Daoxin;Zhang, Mengmeng
通过微弧氧化（MAO）在Ti-6Al-4V合金表面形成含有六方氮化硼（hBN）颗粒和二氧化钛（TiO 2）的复合涂层。研究了加入到电解液中的hBN颗粒的量对所得复合镀层的显微结构、组成和磨损行为的影响。通过扫描电子显微镜、X射线衍射和球盘磨料磨损试验，对所得微弧氧化涂层的微观结构、相组成和摩擦学行为进行了评价。结果表明，由金红石型TiO 2、金红石型TiO 2和hBN相组成的TiO 2/hBN复合涂层比无颗粒涂层的多孔性更小。此外，微弧氧化涂层中hBN颗粒的存在产生了改善的减摩性能。在含2g/L hBN颗粒的电解液中制备的复合镀层具有最好的耐磨性。通过机械抛光工艺去除了微弧氧化涂层的外层疏松层，显著提高了微弧氧化涂层的耐磨性和减摩性能，突出了hBN颗粒在复合涂层中的重要润滑作用。然而，微弧氧化涂层的磨损机制与hBN颗粒的存在无关，其中疲劳磨损占主导地位的抗摩擦性能的微弧氧化涂层与不含hBN颗粒。材料科学与技术学报编辑部版权所有（C）2016出版社：Elsevier Limited
A composite coating containing hexagonal boron nitride (hBN) particles and titanium oxide (TiO2) was formed on the surface of Ti-6Al-4V alloy via micro-arc oxidation (MAO). The effect of quantity of the hBN-particles added into electrolyte on microstructure, composition, and wear behavior of the resulting composite coatings was investigated. Microstructure, phase composition, and tribological behavior of the resulting MAO coatings were evaluated via scanning electron microscopy, X-ray diffraction, and ball-on-disc abrasive tests. The results reveal that the TiO2/hBN composite coating consisting of rutile TiO2, anatase TiO2, and an hBN phase was less porous than particle-free coating. Furthermore, the presence of hBN particles in the MAO coating produced an improved anti-friction property. The composite coating produced in the electrolyte containing 2 g/L of hBN particles exhibited the best wear resistance. The outer loose layer of the MAO coatings was removed by a mechanical polishing process, which led to a significant improvement in the wear resistance and anti-friction properties of the MAO coatings and highlighted an essential lubricating role of hBN particles in the composite coatings. However, wear mechanism of the MAO coatingswas not relevant to the presence of hBN particles, where fatiguewear dominated the anti-fraction properties of the MAO coatings with and without hBN particles. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.