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1、第21卷第2期中国有色金属学报2011年2月Vol.21No.2TheChineseJournalofNonferrousMetalsFeb.2011文章编号：1004-0609(2011)02-0430-06烧结助剂对高气孔率SiC陶瓷结构和性能的影响1,221222王少锋，汪长安，孙加林，周立忠,刘伟渊，黄勇(1.北京科技大学材料学院，北京100083；2.清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室，北京100084)摘要：由叔丁醇、丙烯酰胺和SiC粉及烧结助剂组成固相含量为10%(体积分数)的陶瓷浆料，采用凝
2、胶注模成型和无压烧结工艺制备多孔SiC陶瓷，研究Al2O3和Al2O3+SiO2这两种烧结助剂体系对多孔SiC陶瓷的气孔率、显微结构和力学性能的影响。结果表明：Al2O3+SiO2复合烧结助剂明显改善SiC陶瓷的烧结性能，与采用单一的Al2O3烧结助剂相比，SiC样品的烧结温度和莫来石的生成温度均降低50℃左右；两种不同的烧结助剂制成的试样中的气孔均呈很窄的单峰分布，中位孔径为2μm左右；随烧结温度的升高压缩强度增大，而气孔率变化不大；以Al2O3+SiO2为烧结助剂、在1400℃烧结的试样的气孔率和强度分别达到70.57%和1
3、7.74MPa。关键词：多孔陶瓷；SiC；烧结助剂；烧结性能；凝胶注模；叔丁醇中图分类号：TQ174文献标志码：AEffectsofsinteringadditivesonmicrostructureandpropertiesofporousSiCceramicswithhighporosity1,221222WANGShao-feng,WANGChang-an,SUNJia-lin,ZHOULi-zhong,LIUWei-yuan,HUANGYong(1.SchoolofMaterialsScienceandEngineeri
4、ng,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.StateKeyLaboratoryofNewCeramicsandFineProcessing,DepartmentofMaterialsScienceandEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:TheporousSiCceramicswerefabricatedbygel-castingandpressureless
5、sinteringprocessinairatmospherewithasolidloadingof10%slurryconstitutingoftert-butylalcohol,acrylamide,SiCpowderandsinteringadditives.Theeffectsoftwokindsofsinteringadditives,Al2O3andAl2O3+SiO2,ontheporosity,microstructureandmechanicalpropertiesoftheporousSiCceramicsw
6、erestudied.TheresultsshowthatthesinteringadditiveofAl2O3+SiO2obviouslyimprovesthesinterabilityofSiCceramics,andcomparedwiththatonlyusingAl2O3assinteringadditive,bothsinteringtemperatureofSiCspecimenandformationtemperatureofmullitephasearedecreasedbyabout50℃.Themedian
7、porediameteroftheporousSiCceramicsisabout2μmandpresentssinglepeakdistribution.ThecompressivestrengthoftheporousSiCceramicsincreaseswithincreasingthesinteringtemperature,whereastheporosityhaslittlechange.UsingAl2O3+SiO2assinteringadditive,theporosityandcompressivestre
8、ngthofSiCporousceramicssinteredat1400℃reach70.57%and17.74MPa,respectively.Keywords:porousceramics;SiC;sinteringadditive;sinteringpr
