材料期刊网

为了提高钻杆接头的耐磨损性能，选用由Ti、Cr、Al的氮化物、碳化物和氧化物所构成的金属陶瓷在钻杆接头材料(37CrMnMo)表面制备了多层陶瓷膜层。采用金相显微镜和扫描电子显微镜对金属陶瓷膜层的表面形貌及组织结构进行了分析。用 MS-T3000摩擦磨损试验仪对钻杆接头材料进行旋转摩擦试验，得到表面陶瓷涂层摩擦系数的变化规律，结合摩擦副表面形貌观察和磨屑成分分析，分析了表面陶瓷涂层的耐磨性，探讨了表面陶瓷涂层的动态摩擦磨损机理。结果表明，在摩擦的初始阶段，表面陶瓷涂层摩擦系数急剧增加，随后稳定于某一定值，并在该值附近波动，波动范围逐渐增大。随着磨球被磨平，磨损形式由点面接触磨损，逐渐转换为面面接触磨损，磨斑面积不断增大。摩擦磨损开始以磨粒磨损为主，随着摩擦过程中挤压的加剧和温度的升高，磨屑发生塑性变形，形成不断增厚的转移层，覆盖于对磨面上，阻碍陶瓷涂层与对磨件的直接接触，从而减轻陶瓷涂层的摩擦磨损。

In order to improve the wear resistance property of drilling pipe j oint,cermet consisting of nitrides, carbides and oxides of Ti,Cr,and Al was chosen to prepare multilayer metallic ceramic coating on the surface of drilling pipe joint.Rotating friction test was tested by MS-T3 000 friction wear tester.Combined with friction surface morphology observation and wear debris composition analysis.The wear resistance and dynamic friction-wear mechanisms of ceramic coating was analysed.The results show that:in the initial stage of friction process, friction coefficients increased sharply,then stabilized at a certain value,and fluctuate in the range of values, and the fluctuation range gradually increase.Along with grinding ball gradually became ground flush,the wear behavior converted to surface-to-surface contact wear from the point surface contact wear and the grinding spot area was gradually increasing.Ceramic film samples were first mainly worn by abrasive wear.With the constant pressure of steel ball friction process and the rise of the friction regional temperature,grindings occurred plastic deformation and formed the increasing thicken transfer layer,covering on ground surface,which resulted in hin-dering the direct contact between ceramic sample and grinding,thus reducing the friction and wear of ceramic coating.