为提高钛合金表面耐磨性能,运用电火花沉积技术在TC11钛合金表面原位反应沉积TiN强化层,研究N2流量对强化层显微组织和摩擦学性能的影响。结果表明:当N2流量过小时,强化层厚度较薄,主要由Ti2N、α-Ti、TiO和TiN等相组成,电火花快速放电导致基体表面产生的熔池急速冷凝,使得亚稳态Ti2N相保留在强化层中;当N2流量过大时,强化层微裂纹和孔洞等缺陷较多;而当N2流量适中时,强化层主要由TiN等物相组成,且致密均匀(50~55μm),平均显微硬度达HV0.21165.2,是TC11钛合金基体的3.4倍。当N2流量适中时,TiN强化层的耐磨性能最好,此时其磨损质量为0.4 mg,是TC11基体的2/9,其主要磨损机理为微观切削磨损和多次塑变磨损。 In order to improve the wear resistance of titanium alloy, the TiN reinforced layer was deposited on the surface of TC11 titanium alloy by electro-spark deposition, and the effect of N2 flow on the microstructure and tribological properties of the strengthened layer was studied. The results show that when the flow rate of N2 is too small, the thickness of the strengthened layer is thin and mainly composed of phases such as Ti2N, α-Ti, TiO and TiN. Rapid discharge by sparks causes rapid condensation of the molten pool on the substrate surface, resulting in the metastable Ti2N phase When the flow rate of N2 is too large, there are many defects such as micro-cracks and holes in the strengthened layer. When the flow rate of N2 is moderate, the strengthened layer mainly consists of TiN and other phases, and is dense and uniform (50-55μm) The average microhardness of HV0.21165.2, is 3.4 times that of TC11 titanium alloy matrix. When N2 flow rate is moderate, TiN toughening layer has the best wear resistance, and its wear mass is 0.4 mg, which is 2/9 of TC11 matrix. The main wear mechanism is microscopic cutting wear and multiple plastic deformation wear.