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通过经典粉末冶金的方法制备WC-x%TiC-6%Co硬质合金,研究了WC-x%TiC-6%Co硬质合金(x=0%,2%,4%,6%)的显微组织和力学性能,利用SEM对该材料组织及其冲刷磨损进行了观察与分析,探讨了硬质合金在5%SiO_2的水溶液中的耐冲刷磨损行为。结果表明,TiC的添加有利于硬质合金晶粒的细化,且WC晶粒的形状由原来的规则的四边形晶体逐渐变为不规则的多边形晶体。此外,随着TiC含量增加,硬质合金的硬度逐渐升高,横向断裂强度和断裂韧性随之降低。加入TiC可以显著提高硬质合金的耐冲刷磨损性能,且其冲刷磨损率随着TiC含量的增加先减小后增大,当TiC添加量为4%时,该材料的耐冲刷磨损性能最好,在冲刷60 mins时磨损率为16×10~(-3) g/cm~2。
The WC-x% TiC-6% Co cemented carbide was prepared by the classical powder metallurgy method. The WC-x% TiC-6% Co cemented carbide (x = 0%, 2%, 4%, 6%) The microstructure and mechanical properties were investigated by scanning electron microscopy (SEM). The wear resistance of the alloy was observed and analyzed by SEM. The wear resistance of cemented carbide in 5% SiO 2 aqueous solution was also investigated. The results show that the addition of TiC is beneficial to the grain refinement of the cemented carbides, and the shape of the WC grains gradually changes from the original regular tetragonal crystals to the irregular polygon crystals. In addition, with the increase of TiC content, the hardness of cemented carbide gradually increases, and the transverse rupture strength and fracture toughness decrease. The addition of TiC can significantly improve the wear resistance of the wear-resistant carbide, and the erosion wear rate decreases with the increase of TiC content and then increases, when the TiC content of 4%, the material wear resistance of the best erosion-resistant The wear rate was 16 × 10 ~ (-3) g / cm ~ 2 when 60 mins scoured.