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.2022063等离子活化烧结Ta-2Ti-xTiC复合材料的微观结构与力学性能张建，贾浩，马帅，张诗荃，葛帅，罗国强，沈强(武汉理工大学材料复合新技术国家重点实验室，武汉430070)摘要：采用等离子活化烧结法制备Ta-2Ti-xTiC(x=0、0.5、1.0、2.0和4.0，质量分数，%)复合材料，研究TiC对复合材料微观结构和力学性能的影响。结果表明，随TiC含量增加，复合材料的致密度先升高后降低，Ta-2Ti-0.5TiC的致密度达到最高值99.5%。加入TiC可抑制晶粒生长，晶粒尺寸随TiC含量增加而减小，TiC质量分数为4.0%时，晶粒尺寸减小至2.98µm。TiC在高温下发生脱碳反应，生成的C与Ta反应原位生成高硬度的Ta2C陶瓷相，起到桥接基体晶粒与阻碍裂纹扩展的作用。随SiC含量增加，Ta-2Ti-TiC复合材料的硬度和抗磨强度提高，这得益于晶粒细化与原位生成的Ta2C高硬度陶瓷相。关键词：Ta-Ti-TiC；等离子活化烧结；致密化；力学性能；微观结构中图分类号：TB331文献标志码：A文章编号：1673-0224(2022)06-579-07MicrostructureandmechanicalpropertiesofplasmaactivatedsinteredTa-2Ti-xTiCcompositesZHANGJian,JIAHao,MAShuai,ZHANGShiquan,GEShuai,LUOGuoqiang,SHENQiang(StateKeyLaboratoryofAdvancedTechnologyforMaterialsSynthesisandProcessing,WuhanUniversityofTechnology,Wuhan430070,China)Abstract:Ta-2Ti-xTiC(x=0,0.5,1.0,2.0and4.0,massfraction,%)compositeswerepreparedbyplasmaactivatedsinteringmethod.TheeffectsofTiConthemicrostructureandmechanicalpropertiesofthecompositeswerestudied.TheresultsshowthatwiththeincreaseofTiCcontent,therelativedensityofthecompositesincreasesfirstandthendecreases,andtherelativedensityofTa-2Ti-0.5TiCreachesthehighestvalueof99.5%.TheadditionofTiCcaninhibitthegraingrowth,andthegrainsizedecreaseswiththeincreaseofTiCcontent.WhentheTiCcontentis4.0%,thegrainsizedecreasesto2.98µm.TiCundergoesdecarburizationreactionathightemperature,andthegeneratedCreactswithTatogeneratehigh-hardnessceramicphaseTa2Cinsitu,whichplaysaroleinbridgingmatrixgrainsandhinderingcrackpropagation.ThemechanicalpropertiesofTa-2Ti-TiCcompositesimprovewithincrea...
