熱歷史對CMAS系微晶玻璃的析晶及性能的影響.pdf

1、分類號：密級：公開公開學號：2008110單位代碼：10407碩士學位論文論文題目:熱歷史對熱歷史對CMAS系微晶玻璃的析晶系微晶玻璃的析晶及性能的影響及性能的影響研究方向微晶玻璃微晶玻璃專業(yè)名稱材料學材料學研究生姓名唐自清唐自清研究生學號2008110導師姓名、職稱匡敬忠匡敬忠教授教授二O一一一一年五月江西贛江西贛州IIAbstractMicrocrystallineglasswhichisalsocalledglassceramic

2、crystallizedglass，isthebasisglassofaspecificcompositionwithaspecialheattreatmentmeansthenintheglassphasegeneratingtinyunifmdistributionofcrystalstoobtainamixtureofcrystallineamphousmaterials.Thesuccessfuldevelopmentofthe

3、microcrystallineglasshasaveryimptantpracticaltheeticalvalue.Ithelpsmaketherelationshipamongglasstransitionglassstructureperfmancebetterknowntopeople，pushesthedevelopmentofglassscienceopensupanewwayofmakingcrystalmaterial

4、s.InthisexperimentusinganalyticalgradecalciumcarbonatealuminumoxidemagnesiumcarbonatesilicaasthemainrawmaterialsCaOMgOAl2O3SiO2systemglassispreparedbymelting.Firstthreefmulasofdifferentcomponentsaredeterminedaccdingtothe

5、theyofthecompositiondesignofmicrocrystallineglass.Byobservinganalyzingtheresultsofmeltingdifferentialthermalanalysisanalyzingthecrystallizationresultsthemostsuitabledistributionoftheratiooftheglassgroupfthisexperimentstu

6、dywasachievedi.e.CaO~25%，MgO~15%，Al2O3~10%，SiO2~50%，Sb2O3~2%.CaOMgOAl2O3SiO2systemglassunderthisfmulaat850℃waswithoutcrystallizationphenomenabutitscrystallizationphenomenaatabout1010℃isobviouscrystallinephaseprecipitated

7、mainlypyroxenediopside.Accdingtothebestcompositionofthisexperimentsevendifferentthermalhistyconditionsareusedfpreparationofbasisglassnamely:①coolinginthewater②aircoolingovertheironplate③annealingat650℃f10hours④annealinga

8、t700℃f10hours⑤annealingat750℃f10hours⑥annealingat800℃f10hours⑦annealingat850℃f10hours.TestonthebasisglasswegotbythetestingtechniquesDTAIRSEMetc.discussthechangesincrystallizationkiicparametersofCMASsystemglassindifferent

9、thermalhistyconditionstheimpactofsplitphaseoncrystallization.AnalysisresultsshowthattheCMASsystemglassofthesamecompositionunderdifferentthermalhistyconditionsofwhichexothermicpeakareaspeakheightsaresignificantlydifferent

10、theircrystallizationactivationenergies(E)crystallineindexesweredifferentalsobyvaryingthethermalhisty.Besideswiththeannealingtemperatureincreasingtheaccumulationofnewphaseisbecomingmedispersedletlikeparticlesgraduallyconn

11、ectindispersedwmlikechainthentuckupoverlappingfromeachother.Thechangesofthermalhistyconditionshaveaninfluenceon[SiO4]tetrahedronkeysassociatinginglass.AstheannealingtemperatureincreasesSiOSi、SiOkeysinassociating[SiO4]asy

12、mmetrictelescopicvibrationincreaseassociaion[SiO4]中SiOternaryflexural，decreasingafterthefirstincrease.Atlastinaccdancewiththedifferentialthermalanalysisresultsunderdifferentthermalhisticalconditionsletsamplesfullycrystal