研究了在放电等离子烧结(SPS)条件下,纳米碳化钒(V_8C_7)对超细WC基硬质合金的相组成、微观组织及性能的影响.结果表明:超细WC基硬质合金主要由WC和Co_3C两相组成,相对于未烧结的硬质合金材料,WC的衍射峰向小角度方向偏移;纳米碳化钒可以有效抑制超细WC基硬质合金中WC晶粒的长大,并且随着纳米碳化钒比表面积的增大而增强,添加比表面积为63.36m~2/g的纳米V_8C_7后,硬质合金中大部分WC的晶粒尺寸＜0.5μm;纳米碳化钒对超细WC基硬质合金的性能具有重要影响,并且随着纳米碳化钒比表面积的增大而增加,添加比表面积为63.36m~2/g的纳米V_8C_7后,超细WC基硬质合金具有较高的性能(相对密度99.7%,洛氏硬度93.4,断裂韧性12.7MPa·m~(1/2)).
Effects of vanadium carbide nanopowders(V_8C_7) on the phase compositions,microstructures and properties of ultrafine WC-based cemented carbides were investigated under spark plasma sintering(SPS) conditions.The results show that ultrafine WC-based cemented carbides mainly consists of WC and Co_3C phases,and the diffraction peaks of WC shift towards small angle compared with unsintered material.Vanadium carbide nanopowders can effectively inhibit the WC grain growth in ultrafine WC-based cemented carbides,and the inhibition action increases with increasing specific surface area of V_8C_7 nanopowders.The majority of the grain sizes WC are less than 0.5μm when ultrafine WC-based cemented carbide was added to V_8C_7 nanopowders with the specific surface area of 63.36m~2/g.Vanadium carbide nanopowders have important effects on the properties of ultrafine WC-based cemented carbides,which increase with increasing specific surface area.Ultrafine WC-based cemented carbide has higher properties(relative density 99.5%,HRA 93.2 and K_(IC) 12.5MPa·m~(1/2)) when it is added to V_8C_7 nanopowders with the specific surface area of 63.36m~2/g.
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