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1、第21卷第2期中國有色金屬學(xué)報(bào)2011年2月Vol.21No.2TheChineseJournalofNonferrousMetalsFeb.2011文章編號(hào)：1004-0609(2011)02-0430-06燒結(jié)助劑對(duì)高氣孔率SiC陶瓷結(jié)構(gòu)和性能的影響1,221222王少鋒，汪長安，孫加林，周立忠,劉偉淵，黃勇(1.北京科技大學(xué)材料學(xué)院，北京100083；2.清華大學(xué)材料科學(xué)與工程系新型陶瓷與精細(xì)工藝國家重點(diǎn)實(shí)驗(yàn)室，北京100084)摘要：由叔丁醇、丙烯酰胺和SiC粉及燒結(jié)助劑組成固相含量為10%(體積分?jǐn)?shù))的陶瓷漿料，采用凝
2、膠注模成型和無壓燒結(jié)工藝制備多孔SiC陶瓷，研究Al2O3和Al2O3+SiO2這兩種燒結(jié)助劑體系對(duì)多孔SiC陶瓷的氣孔率、顯微結(jié)構(gòu)和力學(xué)性能的影響。結(jié)果表明：Al2O3+SiO2復(fù)合燒結(jié)助劑明顯改善SiC陶瓷的燒結(jié)性能，與采用單一的Al2O3燒結(jié)助劑相比，SiC樣品的燒結(jié)溫度和莫來石的生成溫度均降低50℃左右；兩種不同的燒結(jié)助劑制成的試樣中的氣孔均呈很窄的單峰分布，中位孔徑為2μm左右；隨燒結(jié)溫度的升高壓縮強(qiáng)度增大，而氣孔率變化不大；以Al2O3+SiO2為燒結(jié)助劑、在1400℃燒結(jié)的試樣的氣孔率和強(qiáng)度分別達(dá)到70.57%和1
3、7.74MPa。關(guān)鍵詞：多孔陶瓷；SiC；燒結(jié)助劑；燒結(jié)性能；凝膠注模；叔丁醇中圖分類號(hào)：TQ174文獻(xiàn)標(biāo)志碼：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
