含钒添加剂对纳米硬质合金性能的影响袁军文1,2曾瑞霖1,2徐涛1,2尹超1,2董涛1,2（1.株洲硬质合金集团有限公司，湖南株洲412000；2.硬质合金国家重点实验室，湖南株洲412000）摘要通过添加草酸氧钒替代碳化钒作为纳米硬质合金制备过程中的抑制剂添加剂，草酸氧钒在湿磨过程中溶解于酒精研磨液中，并在料浆中均匀分散，干燥过程中，草酸氧钒析出并吸附于碳化钨等颗粒表面。烧结过程中，草酸氧钒在400℃左右的温度下转化为氧化钒，在1000℃左右原位还原碳化为碳化钒，该碳化钒均匀分布于合金中，并在后续的液相烧结中抑制碳化钨晶粒长大。研究表明：添加草酸氧钒制备的硬质合金的矫顽磁力值高于添加碳化钒制备的硬质合金的矫顽磁力值；添加碳化钒，容易导致硬质合金中存在碳化钒聚集现象，而添加草酸氧钒制备的合金微观结构没有发现碳化钒聚集现象。关键词纳米硬质合金；抑制剂；碳化钒；草酸氧钒EffectofVanadium-containingAdditivesonPerformanceofNanoCementedCarbidesYuanJunwen1,2ZengRuilin1,2XuTao1,2YinChao1,2DongTao1,2（1.ZhuzhouCementedCarbideGroupCo.Ltd.,ZhuzhouHunan412000,China;2.StateKeyLaboratoryofCementedCarbide,ZhuzhouHunan412000,China）ABSTRACTVanadiumoxalateisaddedtoreplacevanadiumcarbideasaninhibitoradditiveinthepreparationofnanocementedcarbides.Itdissolvesinthealcoholgrindingsolutionduringwetgrindinganduniformlydispersesintheslurry.Duringdrying,vanadiumoxalateprecipitatesoutandadsorbsonthesurfaceoftungstencarbideandotherparticles.Duringthesinteringprocess,itconvertsintovanadiumoxideatatemperatureofabout400oCandturnsintovanadiumcarbidethroughin-situreductionandcarbonizationatabout1000oC.Thevanadiumcarbideisuniformlydistributedinthecementedcarbide,anditinhibitsthegrowthofthetungstencarbidegrainsinthesubsequentliquid-phasesintering.Theresultsshowthatthecoerciveforceofthecementedcarbidepreparedbyaddingvanadiumoxalateishigherthanthatofthecementedcarbidepreparedbyaddingvanadiumcarbide.Theadditionofvanadiumcarbideishighlylikelytoinducetheaccumulationofvanadiumcarbideinthecementedcarbide.Incontrast,noaccumulationofvanadiumcarbideisobservedinthemicrostructureofthecementedcarbidepreparedbyaddingvanadiumoxalate.KEYWORDSnanocementedc...
