目 的 在高速钢钻头表面电火花沉积 Ti( C, N) /Al₂O₃ 复合涂层, 以提高其切削 性能。 方法 利用 电火花沉积技术, 以 Ti( C, N) /Al₂O₃ 作为 电 极材料, 在高速钢钻头表面制 备 Ti( C, N) /Al₂O₃ 涂层, 考察涂层的物相组成、组织形貌及横截面硬度分布, 并进行切削 试验。 结果 涂层组织均 匀 , 厚度约 32 ~36 μm, 物相主要为 C0. 3 N0. 7 Ti, Al₂O₃, AlTi₃, Fe₇W₆, Fe₄N, TiN 和 AlN, 平均 硬度是基体高速钢的 2. 6 倍。结论 在高速钢钻头表面制备 Ti( C, N) /Al₂O₃ 涂层可以提高刀 具的切削 性能, 延长其使用 寿命。

Objective To prepare electro-spark deposited Ti( C, N) /Al₂O₃ coating on high-speed steel ( HSS) drills, and to investigate the cutting performance of the coating. Methods Ti( C, N) /Al₂O₃ composite coatings on high-speed steel ( HSS) drills were prepared by electrospark deposition technique using Ti( C, N) /Al₂O₃ as electrode material. The phase composition, morphology and hardness distribution of the coating were investigated, and the cutting performance tests of the HSS drill coated by Ti( C, N) /Al₂O₃ were also conducted. Results The microstructure of Ti( C, N) /Al₂O₃ coating was homogeneous with a thickness of 32 ~ 36 μm. The phase composition of the coating was mainly C0. 3 N0. 7Ti, Al₂O₃ , AlTi₃ , Fe₇W₆, Fe₄N, TiN and AlN. The average hardness of the coating was 2. 6 times higher than that of HSS. Conclusion Crack-free Ti( C, N) /Al₂O₃ coating could be prepared on HSS drill by electrospark deposition technique. The cutting performance of HSS drill with Ti( C, N) /Al₂O₃ coating was improved and the service life was prolonged.