ABSTRACT New TiC-TiB2 ceramic cutting tool materials TiC-TiB2-Ni-Mo (TBNM8) and TiC-TiB2-Ni (TBN5) with high comprehensive mechanical properties were fabricated by hot pressed sintering with the optimised sintering processes. The cutting performance of TBNM8 in continuously turning austenitic stainless steel (1Cr18Ni9Ti) was experimentally investigated. With the optimal cutting parameters, the cutting performance of TBN5 and commercial tool LT55 were compared in wet and dry turning 1Cr18Ni9Ti. The failure mechanisms of the cutting tools were analysed combined with their high-temperature mechanical properties. The results showed that the tool life of TBN5 and TBNM8 was much longer in continuous dry turning 1Cr18Ni9Ti than that in wet turning, the possible reason was analysed as that the tool materials keeping high mechanical properties at elevated temperature, which led to the great improvement in machining efficiency and good characteristics of environmental friendliness because no cutting fluid was used during the cutting process.

中文翻译：

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TiC-TiB2复合陶瓷刀具的制备及其奥氏体不锈钢车削切削性能

摘要 采用优化的烧结工艺，通过热压烧结制备了具有高综合力学性能的新型TiC-TiB2陶瓷刀具材料TiC-TiB2-Ni-Mo（TBNM8）和TiC-TiB2-Ni（TBN5）。实验研究了 TBNM8 在连续车削奥氏体不锈钢 (1Cr18Ni9Ti) 中的切削性能。在最佳切削参数下，比较了TBN5和商用刀具LT55在干湿车削1Cr18Ni9Ti上的切削性能。结合刀具的高温力学性能分析了刀具的失效机理。结果表明，TBN5和TBNM8的刀具寿命在1Cr18Ni9Ti连续干车削中比湿车削长得多，