第27卷第6期粉末冶金材料科学与工程2022年12月Vol.27No.6MaterialsScienceandEngineeringofPowderMetallurgyDec.2022DOI:10.19976/j.cnki.43-1448/TF.2022059自蔓延高温合成WC粉末的结晶行为高雨阳1，刘咏1，陈刚2，唐啸天2，周承商1(1.中南大学粉末冶金研究院，长沙410083；2.湖南大学材料科学与工程学院，长沙410082)摘要：以黑钨矿(Fe(Mn)WO4)、黄钨(WO3)、电石(CaC2)和高纯铝粉为主要原料，采用自蔓延高温合成法(self-propagatinghigh-temperaturesynthesis,SHS)制备单晶WC粉末，研究添加铝热剂(Fe3O4-Al混合物，n(Fe3O4):n(Al)=3:8)、原料预热和投料量对WC粉末粒度和形貌特征的影响。结果表明：用SHS法制备的WC粉末晶型完整；添加铝热剂会生成大量Fe3W3C相，导致WC粉末的纯度降低；对坩埚内的原料粉末预热会使WC晶粒充分生长，WC粉末粒度增大，同时WC晶粒形貌由球形转变为多边形；增加反应物料投料量会使WC粉末粒径增大，粉末形貌由球形转变为多边形。关键词：自蔓延高温合成；铝热剂；原料粉末预热；反应物料投料量；WC粉末晶型；WC粉末粒度中图分类号：TB332文献标志码：A文章编号：1673-0224(2022)06-630-08Crystallizationbehaviorofself-propagatinghightemperaturesynthesisWCpowderGAOYuyang1,LIUYong1,CHENGang2,TANGXiaotian2,ZHOUChengshang1(1.PowderMetallurgyResearchInstitute,CentralSouthUniversity,Changsha410083,China;2.SchoolofMaterialsScienceandEngineering,HunanUniversity,Changsha410082,China)Abstract:SinglecrystalWCpowderwaspreparedbyself-propagatinghightemperaturesynthesis(SHS)withwolframite(Fe(Mn)WO4),tungsten(WO3),calciumcarbide(CaC2)andhighpurityaluminumpowdersasmainrawmaterials.Theeffectsofthermiteaddition(Fe3O4-Almixture,n(Fe3O4):n(Al)=3:8),preheatingofrawmaterialandfeedingamountonparticlesizeandmorphologycharacteristicsoftheWCpowderwerestudied.TheresultsshowthatthecrystalshapeoftheWCpowderpreparedbySHSmethodiscomplete.Althoughthetemperatureofcombustionsystemisincreasedwithaddingthermite,alargenumberofFe3W3Cphasesareformed,resultinginadecreaseinthepurityofWCpowder.PreheatingtherawpowdersinthecruciblecanmaketheWCgraingrowfully.ThesizeoftheWCpowderbecomeslarger,andtheWCcrystalshapechangesfromsphericaltomultilateralshape.Theparticlesize...
