目的 在等离子喷涂的基础上，采用电接触烧结技术制备具有良好摩擦学性能的NiCr-Cr3C2涂层。方法 采用等离子喷涂工艺将NiCr-Cr3C2涂层预置到GH4169合金试件表面，再经过电接触烧结工艺制备增强涂层。利用OM、SEM、XRD及EDS研究耐磨层的物相、显微组织及化学组成特征，并采用球盘式摩擦磨损试验机对涂层的摩擦学行为进行评价。结果 通过电接触烧结过程中的瞬时热效应，促进了NiCr-Cr3C2等离子喷涂层界面的塑性变形及热扩散，使涂层的孔隙率由5%降到2%，结合强度由46 MPa提升到210 MPa。在400 ℃和600 ℃时，摩擦表面可形成完整的摩擦层，共晶氟化物组分使涂层摩擦系数由室温至400 ℃条件下的0.8降低到600 ℃条件下的0.45。涂层在600 ℃条件下表现出氧化磨损的特征。结论 电接触烧结工艺能实现等离子喷涂NiCr-Cr3C2涂层的性能增强，获得较高结合强度、较低孔隙率和摩擦系数，在600 ℃条件下表现出较好的摩擦磨损性能。

The work aims to prepare NiCr-Cr3C2 coating with good tribological properties by electro-contact sintering on the basis of plasma spraying. The reinforced NiCr-Cr3C2 coating was deposited by electro-contact sintering after prefabricated on GH4169 alloy by plasma spraying. The phases, structure and interface of NiCr-Cr3C2 coating were analyzed by OM, SEM, XRD and EDS. Tribological properties of the coating were evaluated by ball-disk rotating friction and wear tester. The instantaneous heating of electro-contact sintering promoted the plastic deformation and heat diffusion of NiCr-Cr3C2 coating deposited and decreased the porosity from 5% to 2% and increased the adhesion strength from 46 MPa to 210 MPa. A complete friction layer was formed on the friction surface of coating at 400 ℃ and 600 ℃. The coefficient of friction decreased from 0.8 at 400 ℃ to 0.45 at 600 ℃ due to the components of eutectic fluoride. The coating appeared oxidative wear at 600 ℃. Electro-contact sintering can enhance the properties of NiCr-Cr3C2 coating such as higher bonding strength, lower porosity and friction coefficient. The coating exhibits better friction and wear behaviors at 600 ℃.