Microstructure, Mechanical Properties and Low-temperature Tribological Behavior of Cr/Cr-W/W-DLC/DLC Multilayer Coatings on 5A06 Al Alloy
Microstructure, Mechanical Properties and Low-temperature Tribological Behavior of Cr/Cr-W/W-DLC/DLC Multilayer Coatings on 5A06 Al Alloy
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DOI：
10.1016/j.jmrt.2022.03.002
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
Tao Ye;Jianwei Ma;Zhenyuan Jia;Tenglong Li;W. Liu;Wujiang Yu
中科院分区：
文献类型：
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作者：
Tao Ye;Jianwei Ma;Zhenyuan Jia;Tenglong Li;W. Liu;Wujiang Yu
采用非平衡磁控溅射技术和过滤阴极真空电弧技术在5A06铝合金表面制备了Cr/Cr-W/W-DLC/DLC多层涂层。进行了干线性往复滑动磨损试验，以评估沉积涂层在− 100 ° C至25 ° C的不同温度下的摩擦学性能。采用SEM、EDS、纳米压痕仪和纳米划痕仪对涂层的显微组织、力学性能和磨损特性进行了表征。结果表明，与0 ° C和25 ° C相比，多层DLC涂层在低温下的摩擦学性能表现出显著差异。转移层的形成和闪温引起的石墨化有助于解释涂层在室温和0 ° C下优异的摩擦学性能。多层涂层在零度以下温度下的摩擦学性能的恶化归因于石墨化过程的抑制，以及水分子的氧化和毛细作用。循环剪切应力和低温导致微裂纹的形成和表面剥落，这也增加了多层DLC涂层的摩擦系数和磨损率。
In this study, the Cr/Cr-W/W-DLC/DLC multilayer coating was deposited on 5A06 Al alloy using a combination of unbalanced magnetron sputtering system and filter cathode vacuum arc technique. Dry linear reciprocating sliding wear tests were performed to evaluate the tribological properties of the deposited coating at different temperatures from −100 °C to 25 °C. The microstructure, mechanical properties and wear characteristics of the multilayer coating were also characterized by SEM, EDS, nanoindenter and nanoscratch tester, respectively. The results show that, compared with 0 °C and 25 °C, the tribological behavior of the multilayer DLC coating exhibits significant differences at low temperatures. The formation of the transfer layer and the graphitization caused by the flash temperature contribute to explain the excellent tribological performance of the coating at room temperature and 0 °C. The deterioration of the tribological properties of the multilayer coating at subzero temperatures is ascribed to the inhibition of the graphitization process, as well as the oxidation and capillary action of water molecules. Cyclic shear stress and low temperature lead to the formation of microcracks and surface spalling, which also increases the friction coefficient and wear rate of the multilayer DLC coating.