CAJ | 학술논문

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)).
연구료재방전등리자소결(SPS)조건하,납미탄화범(V_8C_7)대초세WC기경질합금적상조성、미관조직급성능적영향.결과표명:초세WC기경질합금주요유WC화Co_3C량상조성,상대우미소결적경질합금재료,WC적연사봉향소각도방향편이;납미탄화범가이유효억제초세WC기경질합금중WC정립적장대,병차수착납미탄화범비표면적적증대이증강,첨가비표면적위63.36m~2/g적납미V_8C_7후,경질합금중대부분WC적정립척촌＜0.5μm;납미탄화범대초세WC기경질합금적성능구유중요영향,병차수착납미탄화범비표면적적증대이증가,첨가비표면적위63.36m~2/g적납미V_8C_7후,초세WC기경질합금구유교고적성능(상대밀도99.7%,락씨경도93.4,단렬인성12.7MPa·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.