助烧剂对SiC多孔陶瓷性能的影响-1

毕业设计（论文）____________________________________________________________________________________________I毕业设计（论文）____________________________________________________________________________________________I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SiO2-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-高岭土多孔陶瓷毕业设计（论文）____________________________________________________________________________________________IIIITitleEffectofSinteringAidsonthePropertiesofPorousSiCCeramicsAbstractThisstudyusessiliconcarbideasmainmaterial,withcarboxymethylcellulose(CMC)asthepore-formingagent,respectively,withSiO2-Y2O3-Al2O3andSiO2-kaolinasthesinteringagent,preparationofporoussiliconcarbideceramics,studieddifferentSiO2-Y2O3-Al2O3andSiO2-kaolincontentonthestructureandmechanicalpropertiesofporoussiliconcarbidematerialeffect.SiO2-Y2O3-Al2O3andSiO2-kaolincontentinfluencestomatalporousSiCceramicsrate,hardnessandbendingstrength.Inthisexperiment,theporosityofporousceramicsbymeasuringArchimedesrate,itshardnesswasmeasuredbyRockwellhardnesstester,thebendingstrengthwasmeasuredusingauniversaltestingmachine.Theexperimentalresultsshowthat:withSiO2-Y2O3-Al2O3assinteringaid,andthecontentofSiO2-Y2O3-Al2O3was20%,theperformancesofporousSiCceramicspreparedwithkaolinthanSiO2-kaolinassinteringaidsadvantages.TakingSiO2-Y2O3-Al2O3assinteringaids,at1500℃canporoussiliconcarbideceramicswithgoodpropertieswasprepared.WhenthecontentofSiO2-Y2O3-Al2O3is20%,thepreparationofporousSiCceramicspreparedwithmechanicalpropertiesofhighporosityandexcellent,theopenporosityis23.73%,hardnessandbendingstrengthis62and15.47MParespectively,atthesametime,itsuniformporedistribution.KeywordsSiCSiO2-Y2O3-Al2O3SiO2-kaolinporousceramic毕业设计（论文）____________________________________________________________________________________________IIIIII目录1引言........................................................................................................................11.1研究背景............................................................................................................11.2多孔陶瓷的性能及应用.....................................................................................21.3多孔陶瓷的制备方法........................................................................................31.4本课题研究的目的和意义................................................................................31.5本课题的研究内容............................................................................................31.6国内外发展的概况............................................................................................42实验.........................................................................................................................52.1实验原料............................................................................................................52.2实验仪器及设备................................................................................................62.3工艺过程............................................................................................................62.3.1制备方法的选择.......................................................................................72.3.2烧成曲线的确定.......................................................................................72.3.3试样制备.................................................................................................82.3.4实验步骤.................................................................................................93性能检测.............................................................................................................133.1气孔率的检测................................................................................................133.2硬度检测........................................................................................................143.3抗折强度检测................................................................................................153.4晶相分析........................................................................................................16结论.........................................................................................................................21致谢.........................................................................................................................22参考文献...............................................................................................................23毕业设计（论文）____________________________________________________________________________________________11引言1.1研究背景多孔陶瓷是指一种经高温烧成，体内具有大量彼此相通或闭合气孔的陶瓷材料。它的发展始于19世纪70年代，初期用于做细菌过滤材料。但由于其优良的性能，多孔陶瓷已逐渐使用于冶金领域、化工部门、环保、能源和生物等方面[1]。利用多孔陶瓷的均匀透过性，可以应用于各种过滤器、分离装置，甚至可制作出流体分布元件、混合元件和渗出元件等