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以Ti粉、B粉、还原铁粉与羰基铁粉为原料,使用微波烧结技术原位生成了TiB_2钢结硬质合金,并研究了TiB_2含量对其组织及性能的影响。通过X衍射分析仪、扫描电镜、能谱分析仪对钢结硬质合金的物相、显微组织和元素分布进行了表征,采用显微硬度计和摩擦磨损试验仪对TiB_2钢结硬质合金的显微硬度及耐磨性进行了测试。结果表明:微波烧结技术可以制备颗粒细小的TiB_2钢结硬质合金,其相对密度均达到95%以上。随着TiB_2含量的增加,硬度显著提高,含量为40%时硬度达到1108HV0.1;随着TiB_2含量的增加,摩擦系数变化不大,但磨损体积减小,且磨损方式为粘着磨损。
Using Ti powder, B powder, reduced iron powder and carbonyl iron powder as raw materials, the TiB 2 steel-bonded cemented carbide was formed in-situ by microwave sintering technique and the effect of TiB 2 content on its microstructure and properties was studied. The phase, microstructure and elemental distribution of the cemented carbide were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The microstructures and elemental distributions of the cemented carbide were characterized by means of microhardness tester and friction and wear tester. The microhardness and wear resistance were tested. The results show that the microwave sintering technology can be used to prepare small grain TiB_2 steel bonded hard alloy, the relative density of more than 95%. With the increase of TiB 2 content, the hardness increases obviously. When the content of TiB 2 is 40%, the hardness reaches 1108HV 0.1. With the increase of TiB 2 content, the friction coefficient does not change much, but the wear volume decreases and the wear mode is adhesive wear.