过程氧化对等离子喷涂Mo涂层耐磨性能的影响

Effects of Process Oxidation on Wear-resistance Property of Plasma Sprayed Mo Coating

利用GTV F6等离子喷枪制备Mo涂层。用SEM观察Mo涂层形貌,用XRD分析喷涂后Mo涂层的物相,用氧氮测定仪测定涂层氧含量,用干摩擦方法测定氧化物对涂层耐磨性能的影响,测定浸油环境下涂层摩擦系数。结果表明,等离子喷涂Mo涂层呈明显的层状组织,且伴有一定程度的过程氧化。过程氧化产生的Mo的氧化物弥散分布在涂层中,能够起到增大显微硬度、降低干摩擦磨损失重的作用。Mo涂层中气孔率越高,对浸油环境下的摩擦系数的影响越大。气孔率高的Mo涂层摩擦系数较小,从而减缓涂层的磨损。

The Mo coatings were preparated by GTV F6 AF5 instrument, lne microstructure ting was observed by scan electron microscope. The X-ray diffraction was used to analyse the phase of the Mo coating. The oxygen nitrogen determinator was used to measure the oxygen content. The wear-resistant property of the Mo coating was measured by the dry friction test, and the friction coefficient under oil impregnation was tested. The result shows that Mo coating has the lamellar structure pattern, and with some degree of process oxidation. The oxygen con- tent dispersed in the Mo coating, increased micro-hardr^ess and decreased loss of the dry friction. The higher is porosi- ty, the Bigger is oil impregnation effect of friction coefficient, and the friction coefficient of high porosity Mo coating is small, reducing the wear of coating.