MoVN-Cu Coatings for In Situ Tribocatalytic Formation of Carbon-Rich Tribofilms in Low-Viscosity Fuels
MoVN-Cu Coatings for In Situ Tribocatalytic Formation of Carbon-Rich Tribofilms in Low-Viscosity Fuels
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用于在低粘度燃料中原位摩擦催化形成富碳摩擦膜的 MoVN-Cu 涂层
DOI：
10.1021/acsami.3c01953
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发表时间：
2023
影响因子：
9.5
通讯作者：
Berman, Diana
中科院分区：
文献类型：
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作者：
Jacques, Kelly;Shirani, Asghar;Smith, Jesse;Scharf, Thomas W.;Walck, Scott D.;Berkebile, Stephen;Eryilmaz, Osman Levent;Voevodin, Andrey A.;Aouadi, Samir;Berman, Diana
抑制依赖燃料润滑的机械组件的摩擦学故障是维持低粘度、低润滑性燃料系统寿命的一个障碍。在本研究中，对MoVN-Cu纳米复合涂层在高粘度和低粘度燃料中的耐磨性进行了摩擦学评估，评估了涂层在温度、载荷和滑动速度条件下的耐久性。结果表明，与未涂层的钢表面相比，MoVN-Cu涂层能有效地降低磨损和摩擦。对MoVN-Cu磨损表面的拉曼光谱、电子显微镜和电子散射谱分析证实，在滑动过程中存在一层非晶态的富碳摩擦膜，它提供了容易剪切和低摩擦。此外，对形成的摩擦膜的表征表明，纳米铜团簇的存在与支持表面保护的摩擦催化起源的碳峰强度重叠。对MoVN-Cu涂层的摩擦学测试表明，摩擦系数随材料磨损量和初始接触压力的增加而减小。这些发现表明，MoVN-Cu是一种很有前途的燃料润滑组件保护涂层，因为它具有从碳氢化合物环境中补充润滑摩擦膜的适应能力。
Inhibiting the tribological failure of mechanical assemblies which rely on fuels for lubrication is an obstacle to maintaining the lifetime of these systems with low-viscosity and low-lubricity fuels. In the present study, a MoVN-Cu nanocomposite coating was tribologically evaluated for durability in high- and low-viscosity fuels as a function of temperature, load, and sliding velocity conditions. The results indicate that the MoVN-Cu coating is effective in decreasing wear and friction relative to an uncoated steel surface. Raman spectroscopy, transmission electron microscopy, and electron-dispersive spectroscopy analysis of the MoVN-Cu worn surfaces confirmed the presence of an amorphous carbon-rich tribofilm which provides easy shearing and low friction during sliding. Further, the characterization of the formed tribofilm revealed the presence of nanoscale copper clusters overlapping with the carbon peak intensities supporting the tribocatalytic origin of the surface protection. The tribological assessment of the MoVN-Cu coating reveals that the coefficient of friction decreased with increasing material wear and initial contact pressure. These findings suggest that MoVN-Cu is a promising protective coating for fuel-lubricated assemblies due to its adaptive ability to replenish lubricious tribofilms from hydrocarbon environments.