烧结工艺和粘结剂对sic网络结构陶瓷性能的影响 毕业论文

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1、烧结工艺和粘结剂对SiC网络结构陶瓷性能的影响摘要碳化硅泡沫陶瓷具有气孔率高、热稳定性好等优良性能,被广泛用作金属溶液过滤器、高温气体和离子交换过滤器、催化剂载体等.重点介绍了碳化硅泡沫陶瓷的种类,阐述了碳化硅泡沫陶瓷的制备方法和影响碳化硅泡沫陶瓷产品性能的因素,展望了碳化硅泡沫陶瓷的发展前景.本文主要阐述了SiC基泡沫陶瓷的结构、性能、制造工艺和应用前景。使用了有机前驱体浸渍法制备SiC基泡沫陶瓷，通过比较在不同条件下（不同粘结剂含量和烧成温度保温时间）试样的常温耐压强度、热震稳定性、容重和孔隙率等性能参数，并用扫描电镜（SEM）对泡沫陶瓷显微结构进行了形貌分析，系统的分析实验条件对

2、试样的影响。实验结果表明：SiC基泡沫陶瓷在1450℃时的烧结保温3小时比保温2小时和4小时的热震次数多和抗压强度高；粘结剂的加入能够有效提高坯体的挂浆效果，较高温度烧结会导致烧结体产生大量玻璃相，降低其耐火度和高温强度，但是不利于SiC基泡沫陶瓷的综合性能参数。在1450°C保温3个小时粘结剂加入量为8%的SiC基泡沫陶瓷抗压强度为0.632MPa，900℃加热、20℃水急冷其热震次数高达16次。烧结温度为1450℃时制备的SiC基泡沫陶瓷过滤器具有较好的综合性能。关键词：泡沫陶瓷，SiC，粘结剂，保温时间，抗热震性，抗压强度，VSinteringProcessandBinderon

3、thesic-basedFoamCeramicsAbstractSiliconcarbidefoamceramicwithgoodperformancesuchashighporosity，excellentthermalstability，itiswidelyusedassolutionofmetalfilters，high-temperaturegasesandionexchangefilters，catalystsupport,andsoon.Thetypeofsiliconcarbidefoamceramicarefocusedinthisarticle,thepreparat

4、ionmethodsofsiliconcarbidefoamceramicandfactorsthataffecttheperformanceofsiliconcarbidefoamceramicproductareintroduced，andthesiliconcarbidefoamcera-mic'sprospectsareexpected.ThispaperdescribesthestructureofSiC-basedceramicfoam,performance,manufacturingprocessesandapplications.Organicprecursoruse

5、dinimpregnationSiC-basedceramicfoam,bycomparingthedifferentconditions(differentbindercontentandsinteredatdifferenttemperatures)samplesatroomtemperaturecompressivestrength,thermalshockstability,bulkdensityandporosityandotherperformanceparametersAndbyscanningelectronmicroscopy(SEM)onthemicrostruct

6、ureoftheceramicfoammorphology,systematicanalysisoftheimpactofexperimentalconditionsonthesample.Experimentalresultsshowthat:SiC-basedceramicfoamsinteredat1450℃andheatpreservationtimewas3hisbetterthanheatpreservationtimewas2hand4hthansinteringthermalshockandhighcompressivestrengthmoreoften;bindera

7、ddedtoimprovegreenbodyhangingplasmaeffect,hightemperaturesinteringWillleadtoalargeamountofsinteredglassphase,refractorinessandhightemperaturereducethestrengthofSiC-basedceramicfoamisnotconducivetothecomprehensiveperformancep