Preparation of self-lubricating composite coatings through a micro-arc plasma oxidation with graphite in electrolyte solution
Preparation of self-lubricating composite coatings through a micro-arc plasma oxidation with graphite in electrolyte solution
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DOI：
10.1016/j.surfcoat.2014.03.004
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发表时间：
2014-11
影响因子：
5.4
通讯作者：
K. Ma;M. Bosta;Wei-Te Wu
中科院分区：
文献类型：
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作者：
K. Ma;M. Bosta;Wei-Te Wu
本研究通过在碱性硅酸钠电解质溶液中微弧氧化（MAO）在含有石墨颗粒的6061铝合金上制备低摩擦耐磨复合涂层。球盘磨损试验在潮湿环境中进行，以研究摩擦和磨损性能。在电解液中添加石墨添加剂的生长层中观察到 Al2O3、Al2OC、Al4C3、Al4O4C 和石墨相。使用石墨颗粒添加剂制备的样品中，火山状微结构的数量明显减少，并且显着变宽。对于不添加石墨添加剂的样品，在1200次循环后出现涂层失效，而添加石墨的样品摩擦系数平均保持在0.1左右，并在15000次磨损测试后达到最大值0.12。捕获在氧化铝基体或缝隙中的石墨和碳润滑相充当微米/纳米储库，以保持低摩擦并有利于涂层的高耐久性。
In this study, low friction and wear resistant composite coatings were produced through the micro-arc oxidation (MAO) on 6061 aluminum alloy with graphite particles in alkali sodium silicate electrolyte solution. The ball-on-disk wear tests were performed in humid environment to investigate the friction and wear properties. The Al2O3, Al2OC, Al4C3, Al4O4C, and graphite phases were observed in a grown layer with graphite additives in electrolyte solution. The volcano-like microstructures were decreased in population and widened significantly in the sample prepared with the additive of graphite particles. For the sample prepared without graphite additives, the coating failure occurred after 1200 cycles, while the additive of graphite maintained the average of friction coefficient around 0.1, and reached a maximum of 0.12 after 15 000 cycles of wear test. The graphite and carbon containing lubricating phases trapped in the alumina matrix or crevices acted as micro/nano-reservoirs to maintain low friction and favor high endurance of the coating.