为了提高表面硬度和耐磨性,采用不同渗氮介质对TC4钛合金进行真空渗氮处理。采用金相显微镜、X射线衍射、扫描电镜、显微硬度计及耐磨试验机分析了渗氮层的组织与性能。结果表明,TC4钛合金经真空渗氮处理后,可获得由Ti N、Ti2Al N和Ti3Al组成的复合改性层。相同条件下与NH3相比,采用高纯N2渗氮可获得更为致密的氮化物层,表面硬度和耐磨性更高,其表面硬度为1100~1200 HV,有效硬化层深度可达50~60μm。 In order to improve the surface hardness and wear resistance, using different nitriding medium TC4 titanium alloy vacuum nitriding. The microstructure and properties of nitrided layer were analyzed by metallographic microscope, X-ray diffraction, scanning electron microscopy, microhardness tester and wear tester. The results show that the composite modified layer composed of TiN, Ti2AlN and Ti3Al can be obtained after vacuum nitriding TC4 titanium alloy. Compared with NH3 under the same conditions, the use of high purity N2 nitriding can be more dense nitride layer, the surface hardness and wear resistance is higher, the surface hardness of 1100 ~ 1200 HV, effective hardened layer depth of up to 50 ~ 60 μm.