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采用粉末冶金法制备了Ti(C,N)基金属陶瓷,并用固体渗硼法对其进行了渗硼处理。研究了渗硼后金属陶瓷的微观组织和力学性能以及渗硼对切削性能的影响。结果表明:Ti(C,N)基金属陶瓷的渗硼层组织由硼化物层、扩散层和基体区组成。渗硼使金属陶瓷的表面硬度提高,抗弯强度降低。渗硼使金属陶瓷刀具在切削速度为200 m/min时的使用寿命提高约1倍;在300 m/min切削速度下,渗硼对延长金属陶瓷刀具的使用寿命没有明显作用;切削速度增至400 m/min时,渗硼使金属陶瓷刀具的使用寿命变短。强烈的热冲击是导致高速切削条件下渗硼层耐磨性降低的主要原因。渗硼层有效地减轻了金属陶瓷刀具表面发生的粘结,并抑制了刀具的扩散磨损和氧化磨损。
Ti (C, N) -based cermets were prepared by powder metallurgy and borided by solid-boring method. The microstructure and mechanical properties of cermets after boronizing and the effect of boronizing on the cutting performance were studied. The results show that the boronizing layer of Ti (C, N) -based cermets consists of boride layer, diffusion layer and matrix region. Boronizing increases the surface hardness of the cermet and decreases the bending strength. Boronizing increased the service life of cermet tools by about 1 time at a cutting speed of 200 m / min. At 300 m / min cutting speed, boronizing had no significant effect on extending the service life of cermet tools. The cutting speed increased to 400 m / min, boriding boron metal ceramic tool life shorter. Strong thermal shock is the main reason for the reduced wear resistance of boronized layers under high-speed cutting conditions. Boronizing layer effectively reduce the surface of the cermet cutter bonding occurs, and inhibit the tool diffusion wear and oxidation wear.