A Comparison Study on Wear Behaviors of Mo and Al2O3-Mo Coatings from RT to 300 °C
A Comparison Study on Wear Behaviors of Mo and Al2O3-Mo Coatings from RT to 300 °C
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DOI：
10.3390/lubricants6020048
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发表时间：
2018-05
期刊：
影响因子：
3.5
通讯作者：
Jian-hui Yan;Yuanjun Guo;Yi Wang;P. Zhou;J. Qiu
中科院分区：
文献类型：
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作者：
Jian-hui Yan;Yuanjun Guo;Yi Wang;P. Zhou;J. Qiu
采用大气等离子喷涂技术在低碳钢基体上制备了Mo和Al 2 O3-Mo涂层。对比研究了两种喷涂涂层的显微组织和力学性能，并着重研究了其在室温至300 °C的摩擦学行为。涂层的显微组织分析表明，Al 2 O3-Mo涂层的孔隙率高于Mo涂层。Al 2 O3颗粒的加入降低了涂层与基体的结合强度。与Mo涂层相比，Al 2 O3-Mo涂层显示出改善的机械性能，例如硬度和耐磨性。两种涂层的摩擦系数均随着测试温度的进一步升高而增加。在100 °C以上测试的Al 2 O3-Mo涂层的摩擦系数低于Mo涂层。两种涂层的磨损失效机制均为分层、脆性断裂、氧化和粘着磨损。此外，在Mo涂层中也发现了局部塑性变形。
Mo and Al2O3-Mo coatings are fabricated on a low-carbon steel substrate using atmospheric plasma spraying. The microstructure and mechanical properties of two as-sprayed coatings, with a particular focus on the tribological behaviors from room temperature to 300 °C, are comparatively investigated in this study. Microstructural analysis of the coatings shows that the porosity of the Al2O3-Mo coating is higher than that of Mo coating. The addition of Al2O3 particles reduces the coating–substrate adhesion strength. The Al2O3-Mo coating, in comparison to the Mo coating, shows improved mechanical properties, such as hardness and wear resistance. The friction coefficients of both coatings increase with further increases in test temperatures. The friction coefficient of the Al2O3-Mo coating, tested above 100 °C, is lower than that of the Mo coating. The wear failure mechanisms of the two coatings are delamination, brittle fracture, oxidation and adhesion wear. In addition, local plastic deformation was also found in the Mo coating.