Optimization of surface texture fabricated by three-step microarc oxidation for self-lubricating composite coating of diesel engine piston skirts
Optimization of surface texture fabricated by three-step microarc oxidation for self-lubricating composite coating of diesel engine piston skirts
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DOI：
10.1016/j.wear.2020.203557
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发表时间：
2021-02-15
期刊：
影响因子：
5
通讯作者：
Ma, Shenglin
中科院分区：
文献类型：
--
作者：
Ma, Chunsheng;Liu, Jian;Ma, Shenglin
为改善柴油机活塞裙部自润滑复合涂层的摩擦学性能，采用三步微弧氧化工艺对表面织构进行优化。将WS2作为自润滑添加剂引入到自润滑复合涂层中。采用XPS、微米CT、SEM、XRD和EDS等分析手段，研究了微弧氧化不同阶段和时间的电参数对膜层微观结构和化学成分的影响。在干润滑条件下，通过摩擦磨损试验研究了复合涂层的自润滑性能。与ZL109铝合金相比，优化后的复合涂层的摩擦系数降低了60%。与优化后的复合涂层匹配的缸套试样在此工况下的磨损量几乎为零。
A surface texture produced by three-step microarc oxidation (MAO) was optimized to improve the tribology performance of a self-lubricating composite coating for diesel engine piston skirts. WS2 was introduced into the self-lubricating composite coating as a self-lubricating additive. The effects of MAO's varying electrical parameters in terms of stages and action time on the microstructure and chemical composition of the coatings were analyzed by XPS mapping, micron CT, SEM, XRD, and EDS mapping. Furthermore, friction-wear tests under dry lubricating were employed to evaluate the self-lubricating property of the composite coating. Compared to the bare ZL109 aluminum alloy, the optimized composite coating's friction coefficients were reduced by 60%. Notably, the wear loss of cylinder liner samples matched with the optimized composite coating was almost zero under this work condition.