第28卷第3期粉末冶金材料科学与工程2023年6月Vol.28No.3MaterialsScienceandEngineeringofPowderMetallurgyJun.2023DOI:10.19976/j.cnki.43-1448/TF.2023005溶胶凝胶、碳热/硼热还原法制备ZrB2-SiC-LaB6超细复相粉体周哲1,夏大旺2,李智2,廖桓毅1,金鑫1(1.长沙理工大学材料科学与工程学院,长沙410114;2.湘潭大学材料科学与工程学院,湘潭411105)摘要:以氧氯化锆(ZrOCl2·8H2O)、硼酸(H3BO3)、水合氯化镧(LaCl3·7H2O)、正规酸乙酯(TESO)和葡萄糖(C6H12O6)为主要原料,以聚乙二醇(PEG)为分散剂,采用溶胶凝胶法和碳热/硼热还原工艺制备ZrB2-SiC-LaB6超细复相粉体。利用X射线衍射、扫描电镜、红外光谱和差示扫描量热分析等对ZrB2-SiC-LaB6粉体进行表征,研究烧结温度、原料配比对复相粉体合成过程的影响。结果表明,当原料中n(Zr)∶n(B)∶n(Si)∶n(La)∶n(C)=1∶3∶0.7∶0.16∶8时,在氩气气氛中1500℃保温2h,可合成高纯ZrB2-SiC-LaB6超细复相粉体。颗粒平均粒径为300nm,其中ZrB2相为六方晶系,SiC相和LaB6相为立方晶系,三元微晶平均尺寸为33.2nm。关键词:ZrB2-SiC-LaB6;溶胶凝胶;碳热/硼热还原;超细复相粉体;超高温陶瓷中图分类号:U465.3文献标志码:A文章编号:1673-0224(2023)03-223-10PreparationofZrB2-SiC-LaB6ultrafinemultiphasepowdersbysol-gelandcarbothermal/borothermalreductionZHOUZhe1,XIADawang2,LIZhi2,LIAOHuanyi1,JINXin1(1.SchoolofMaterialsScienceandEngineering,ChangshaUniversityofScienceandTechnology,Changsha410114,China;2.SchoolofMaterialsScienceandEngineering,XiangtanUniversity,Xiangtan411105,China)Abstract:ZrB2-SiC-LaB6ultrafinemultiphasepowderswerepreparedbythewayofsol-gelmethodandcarbothermal/borothermalreductionprocess,usingzirconiumoxychloride(ZrOCl2·8H2O),boricacid(H3BO3),hydratedlanthanumchloride(LaCl3·7H2O),ethylorthoate(TESO),andglucose(C6H12O6)asthemainrawmaterials,polyethyleneglycol(PEG)asthedispersant.TheeffectsofdifferenttemperaturesandrawmaterialratiosonthesynthesisprocessofcompositepowderswerestudiedandcharacterizedbyX-raydiffraction,SEM,infraredspectroscopy,anddifferentialthermalscanning.Theresultsshowthatwhenn(Zr)∶n(B)∶n(Si)∶n(La)∶n(C)=1∶3∶0.7∶0.16∶8intherawmaterial,ZrB2-SiC-LaB6superfinemultiphasepowder...