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采用粉末冶金法制备了纳米改性Ti(C,N)基金属陶瓷,并用固体粉末法对其进行了渗硼处理。研究了渗硼处理对Ti(C,N)基金属陶瓷微观组织以及抗弯强度和硬度的影响。结果表明:渗硼处理使Ti(C,N)基金属陶瓷中生成了CoB、TiB2、MoB2和石墨相。金属陶瓷的渗硼层由硼化物层、扩散层和基体区组成,厚度为100～140μm。硼化物层主要由CoB组成,扩散层含有较多孔隙,基体区存在富硼的渗硼影响区,影响区具有与Ti(C,N)基金属陶瓷近似的微观组织,但金属相含量较少。渗硼处理使Ti(C,N)基金属陶瓷的抗弯强度降低,主要是由材料中产生的热应力、组织应力以及组织变化引起的。Ti(C,N)基金属陶瓷的表面硬度提高48.7%。在由渗硼层表面向内部100～140μm范围内,硬度呈下降趋势。
The nano-modified Ti (C, N) -based cermets were prepared by the powder metallurgy method, and borided by solid powder method. The effects of boronizing treatment on microstructure, flexural strength and hardness of Ti (C, N) -based cermets were investigated. The results show that CoB, TiB2, MoB2 and graphite phases are formed in Ti (C, N) -based cermets by boronizing treatment. Boronizing layer of cermet consists of a boride layer, a diffusion layer and a base region, having a thickness of 100 to 140 μm. The boride layer is mainly composed of CoB, the diffusion layer contains more pores, boron-rich boron-infiltrated zone is present in the matrix zone, and the microstructure is similar to Ti (C, N) -based cermet in the influence zone, . The boronizing treatment decreases the flexural strength of Ti (C, N) -based cermets, which is mainly caused by thermal stress, microstructure stress and microstructure changes in the material. The surface hardness of Ti (C, N) -based cermets increased by 48.7%. In the range of 100 ~ 140μm from the surface of boronizing layer to the inside, the hardness tends to decrease.