目的 提高钛合金钻杆的耐磨性能。方法 先对钛合金钻杆表面进行微弧氧化处理，然后再对微弧氧化层进行（PTFE+石墨）复合处理，得到（PTFE+石墨）复合膜层。利用扫描电镜（SEM）观察TiO2/(PTFE+石墨)复合膜层的表面形貌，通过能谱（EDS）分析膜层元素的含量，用X射线衍射（XRD）分析复合膜层的相组成，用多功能摩擦磨损试验机测试膜层的摩擦磨损性能，并利用三维显微镜（白光干涉仪）观察微弧氧化层磨损后磨痕的三维形貌。结果 PTFE和石墨进入钛合金微弧氧化层的微孔中，并在表面形成薄薄的一层PTFE+石墨复合涂层。膜层中主要含有Ti、O、Si、Al、P、V、C、F等元素，其中碳和氟质量分数分别达到9.96%和25.53%。XRD分析结果表明，TiO2/(PTFE+石墨)复合膜层中除了锐钛矿型TiO2和金红石型TiO2外，还含有PTFE和石墨。TiO2/(PTFE+石墨)复合膜层的摩擦系数为0.19，磨痕宽度和深度分别为210 μm和1.5 μm，相对耐磨性达到18.73。复合膜层的磨痕没有明显的铧犁沟，磨痕比较平整。与TC4钛合金基体相比，TiO2/(PTFE+石墨)复合膜层的耐磨性得到了明显提高。TiO2/(PTFE+石墨)复合膜层的磨损以磨粒磨损为主，伴有粘着磨损。结论 采用两步法对钛合金进行TiO2/(PTFE+石墨)复合处理后，可有效提高钛合金的耐磨性能。

The work aims to improve the abrasion resistance of titanium alloy drill pipe.The micro-arc oxidation treatment was performed on the surface of the titanium alloy drill pipe, and then the micro-arc oxidation coating was subjected to (PTFE + graphite) composite treatment to obtain a (PTFE + graphite) composite coating. The surface morphology of the TiO2/(PTFE+ graphite) composite coating was observed by scanning electron microscopy (SEM). The content of the coating elements was an-alyzed by energy dispersive spe-ctroscopy (EDS). The phase composition of the composite coating was analyzed by X-ray dif-fraction (XRD). The friction and wear properties of the coating weretested by multi-functional friction and wear tester, and the three-dimensional morphology of wear scars on the micro-arc oxidation layerafter abrasion was observed by a three- di-mensional microscope (whitelight interferometer). PTFE and graphite entered the micropores of the micro-arc oxidation layer and formed a thin layer of PTFE and graphite composite coating on the surface. The coating wasmainly composed of Ti, O, Si, Al, P, V, C, F and other elements, in which the content of carbon and fluorine (wt%) reached 9.96% and 25.53%, respectively. The XRD analysis showed that the TiO2/(PTFE+graphite) composite coating contained PTFE and graphite besides anatase TiO2 and rutile TiO2. The friction coefficient of TiO2/(PTFE+graphite) composite coating was 0.19, the wear scar width and depth were 210 μm and 1.5 μm, respectively, and the relative abrasion resistance was 18.73. The wear marks of the composite coating didnot have any obvious plough furrow, and thewear marks wererelatively flat. Compared with TC4 titanium alloy, the wear resistance of TiO2/(PTFE + graphite) composite coating was significantly improved. The wear of TiO2/(PTFE+graphite) composite coating wasdominated by abrasive wear, along with some adhesive wear. The treatment of titanium alloy TiO2/(PTFE + graphite) composite by two-step method can effectively improve the wear resistance of titanium alloy.