【摘 要】
：
Ti(C,N)-TiB2 cermets were fabricated from Ti(C,N), TiB2, Co and WC powder mixtures via a vacuum hot pressing process. The influence of TiB2 content on their microstructures and mechanical properties was investigated. As a result of the elevated TiB2 conte
【机 构】
：
School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;Zhejiang Pr
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
Ti(C,N)-TiB2 cermets were fabricated from Ti(C,N), TiB2, Co and WC powder mixtures via a vacuum hot pressing process. The influence of TiB2 content on their microstructures and mechanical properties was investigated. As a result of the elevated TiB2 contents, two types of core-rim microstructures were present in the Ti(C,N)-TiB2 cermets, and remarkably improved mechanical properties were achieved. With the increase of TiB2 content, the flexural strength, fracture toughness and hardness of the Ti(C,N)-TiB2 cermets first increased, and then decreased, while their relative density consistently decreased. Attributed to an integration of the intergranular and intrangranular fracture behaviors, the Ti(C,N)-TiB2 cermets with 20 wt％ TiB2 content exhibited the best overall properties with the relative density, hardness, fracture toughness and flexural strength at 99.3％, 1995 HV, 7.92 MPa·m1/2 and 1114 MPa, respectively. The underlying mechanism for their enhanced properties was studied in detail.
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