TC4合金表面氩弧熔覆TiCp/Ti基复合涂层组织及耐磨性

利用氩弧熔覆技术在TC4合金表面制备出TiC增强的Ti基复合涂层。利用SEM、XRD和EDS分析了熔覆涂层的显微组织;利用显微硬度仪测试了复合涂层的显微硬度;利用摩擦磨损试验机测试了涂层在室温干滑动磨损条件下的耐磨性能。结果表明:氩弧熔覆涂层组织均匀致密,熔覆层与基体呈冶金结合,涂层中有大量的TiC树枝晶和条块状TiC颗粒;复合涂层明显改善了TC4合金的表面硬度,HV平均硬度可达9GPa;复合涂层室温干滑动磨损机制为磨粒磨损和轻微粘着磨损。

Microstructure and Wear Resistance of TiCp/Ti Composite Coating on TC4 Alloy by Argon Arc Cladding

Ti-based composite coating reinforced by TiC particles was prepared on the surface of TC4 alloy by means of argon arc cladding technique using the pre-alloyed powder of TiC and Ti. The microstructure of the coating was analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive spectrum (EDS). Microhardness and wear resistance at room temperature of the composite coating were examined by means of microhardness tester and wear tester, respectively. The results indicate that the coating microstructure is uniform and dense, and excellent bonding exists between the coating and the TC4 alloy substrate. The coating has a great quantity of dendrite TiC and lump shaped TiC particles. The composite coating reinforced by TiC particle apparently improves surface hardness of TC4 alloy, the average microhardness can reach 9 GPa. The wear mechanism of coatings results from abrasive wear and slight adhesive wear.