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1、毕业设计（论文）____________________________________________________________________________________________2323毕业设计（论文）____________________________________________________________________________________________摘要本研究以碳化硅为主料，以羧甲基纤维素钠(CMC)为造孔剂，分别用SiO2-Y2O3-Al2O3和SiO2-高岭土作为助烧剂，制备了多孔碳化硅陶瓷，研究了
2、不同SiO2-Y2O3-Al2O3和SiO2-高岭土含量对多孔碳化硅材料结构和力学性能的影响。SiO2-Y2O3-Al2O3和SiO2-高岭土的含量影响碳化硅多孔陶瓷的气孔率、硬度及其抗折强度。本次实验采用了阿基米德法测量多孔陶瓷的气孔率，采用洛氏硬度仪测量了其硬度，采用万能材料试验机测量了其抗折强度。实验结果表明：以SiO2-Y2O3-Al2O3为助烧剂，且SiO2-Y2O3-Al2O3含量为20%时，所制备的碳化硅多孔陶瓷性能较以SiO2-高岭土为助烧剂时优越。以SiO2-Y2O3-Al2O3为助烧剂，在1500℃可以制备出性能较好的多孔碳化硅陶瓷。当S
3、iO2-Y2O3-Al2O3含量为20％时，所制备的碳化硅多孔陶瓷兼具有较大的气孔率和优良的力学性能，其开口气孔率为23.73%，硬度及抗折强度分别为62和15.47MPa，从断口可以看出气孔较多且分布均匀。关键词：碳化硅SiO2-Y2O3-Al2O3SiO2-高岭土多孔陶瓷2323毕业设计（论文）____________________________________________________________________________________________TitleEffectofSinteringAidsonthePropertie
4、sofPorousSiCCeramicsAbstractThisstudyusessiliconcarbideasmainmaterial,withcarboxymethylcellulose(CMC)asthepore-formingagent,respectively,withSiO2-Y2O3-Al2O3andSiO2-kaolinasthesinteringagent,preparationofporoussiliconcarbideceramics,studieddifferentSiO2-Y2O3-Al2O3andSiO2-kaolinconte
5、ntonthestructureandmechanicalpropertiesofporoussiliconcarbidematerialeffect.SiO2-Y2O3-Al2O3andSiO2-kaolincontentinfluencestomatalporousSiCceramicsrate,hardnessandbendingstrength.Inthisexperiment,theporosityofporousceramicsbymeasuringArchimedesrate,itshardnesswasmeasuredbyRockwellha
6、rdnesstester,thebendingstrengthwasmeasuredusingauniversaltestingmachine.Theexperimentalresultsshowthat:withSiO2-Y2O3-Al2O3assinteringaid,andthecontentofSiO2-Y2O3-Al2O3was20%,theperformancesofporousSiCceramicspreparedwithkaolinthanSiO2-kaolinassinteringaidsadvantages.TakingSiO2-Y2O3
7、-Al2O3assinteringaids,at1500℃canporoussiliconcarbideceramicswithgoodpropertieswasprepared.WhenthecontentofSiO2-Y2O3-Al2O3is20%,thepreparationofporousSiCceramicspreparedwithmechanicalpropertiesofhighporosityandexcellent,theopenporosityis23.73%,hardnessandbendingstrengthis62and15.47M
8、Parespectively,atthesameti
