论文部分内容阅读
以Ti-Si-C单质元素混合粉末为原料,采用激光合金化技术在TC4钛合金表面成功制备出Ti-Si-C合金涂层。利用金相显微镜(OM)、扫描电子显微镜(SEM)及其配备的能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计以及摩擦磨损试验机,分析了涂层的组织形貌、成分和物相,测试了涂层的显微硬度及与YG6在干摩擦磨损条件下的摩擦磨损性能。结果表明:在激光功率P=2.0 k W,扫描速度v=9 mm·s~(-1),光斑直径D=2 mm下制备的涂层整体均匀致密、无裂纹,与TC4基体具有较高的冶金结合性;涂层组织主要由α-Ti基体、网状分布的Ti_3Si C_2,Ti_5Si_3/β-Ti共晶体(室温下为Ti_5Si_3/α-Ti)和弥散分布的Ti C相组成;Ti-Si-C涂层的显微硬度值沿层深变化比较平缓,平均硬度为HV 649,比TC4基体(HV 360)提高了80%;涂层平均摩擦系数为0.38,比钛合金基体(0.45)降低了16%;涂层的磨损体积为0.048 mm~3,耐磨性是钛合金基体(0.13 mm~3)的2.71倍。
Ti-Si-C elemental powder was used as raw material to prepare Ti-Si-C alloy coating on TC4 titanium alloy by laser alloying. The microstructure of the coating was analyzed by OM, SEM and EDS, XRD, microhardness tester and friction and wear tester. Appearance, composition and phase, the microhardness of the coatings and the friction and wear properties of YG6 under dry friction and wear conditions were tested. The results show that the coating prepared at laser power of P = 2.0 k W, scanning speed of v = 9 mm · s -1 and spot diameter of D = 2 mm is uniform and compact without crack, which is higher than that of TC4 substrate (Ti_5Si_3 / α-Ti) at room temperature and dispersed TiC phase. The microstructure of the coating is composed of α-Ti matrix, Ti_3Si C_2, Ti_5Si_3 / β- The microhardness of Si-C coating changes more slowly along the depth of the layer with an average hardness of HV 649, an increase of 80% over the TC4 substrate (HV 360); the average coefficient of friction of the coating is 0.38, Decreased by 16%. The worn volume of the coating was 0.048 mm ~ 3, and the wear resistance was 2.71 times that of the titanium alloy substrate (0.13 mm ~ 3).