目的：在高速钢钻头表面电火花沉积 Ti(C,N)/ Al2 O3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)/ Al2 O3作为电极材料,在高速钢钻头表面制备 Ti(C,N)/ Al2 O3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32~36μm,物相主要为 C0.3 N0.7 Ti,Al2 O3,AlTi3,Fe7 W6,Fe4 N,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)/ Al2 O3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) / Al2 O3 coating on high-speed steel (HSS) drills, and to in-vestigate the cutting performance of the coating. Methods Ti(C,N) / Al2 O3 composite coatings on high-speed steel (HSS) drills were prepared by electrospark deposition technique using Ti(C,N) / Al2 O3 as electrode material. The phase composition, morpholo-gy and hardness distribution of the coating were investigated, and the cutting performance tests of the HSS drill coated by Ti(C,N) / Al2 O3 were also conducted. Results The microstructure of Ti(C,N) / Al2 O3 coating was homogeneous with a thickness of 32 ~ 36 μm. The phase composition of the coating was mainly C0. 3 N0. 7 Ti, Al2 O3 , AlTi3 , Fe7 W6 , Fe4 N, TiN and AlN. The ave-rage hardness of the coating was 2. 6 times higher than that of HSS. Conclusion Crack-free Ti(C,N) / Al2 O3 coating could be pre-pared on HSS drill by electrospark deposition technique. The cutting performance of HSS drill with Ti(C,N) / Al2 O3 coating was improved and the service life was prolonged.
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