鋁酸釓粉體的制備工藝及燒結(jié)行為研究.pdf

1、青島大學(xué)碩士學(xué)位論文鋁酸釓粉體的制備工藝及燒結(jié)行為研究姓名：張展申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：凝聚態(tài)物理指導(dǎo)教師：陳沙鷗20120604TheresearchonpreparationtechnologyandsinteringbehaviorofGadoliniumalnminates(GdAl03)AbstractGdAl03withperovskitestructurehastllethermalconductivityequivale

2、nttoyttriumaluminumgarnet，andthehigllthermalshockfactorItssinglecrystalattractspeople’Sattention嬲anewmatrixforsolidstatelasersandscintillatorsAsarareearthaluminates，inadditiontothematrix鶴functionalmaterials，compositedwit

3、hA1203canimprovehightemperaturemechanicalpropertiesofA1203ceramic，buttherearefewpapersreportedaboutitspreparationandsinteringbehaviorsTherefore，thepresentpaperpaytheattentiontoprepareGdAl03powdersusingsolgelmethodandcopr

4、ecipitationmethod，studiedthesinteringbehaviorofsamplesItwillprovideguidancefortherareearthaluminatestosynthesiscompositeceramicswithaluminaUsingtheSO—gelmethod，thepure—phaseGdAl03powderwasobtainedat1000“(2、Ⅳiththeheatpre

5、servationtimeof2hoursandtheaveragegrainsizeofthepowderwasabout200nnlThesinteringexperimentsfoundthatthesinteredcompactswerenotinhighdensification，theaveragelineexpansioncoefficientsofgreencompactsandsinteredcompactwere96

6、7x10o／℃and136xl0。／℃respectivelyWeadoptedArrheniusformulatocalculatethesinteringactivationenergyforGdAl03，theresultwere224kJ／moland316kJ／molrespectivelyonthebasisofshrinkageandrelativedensity111epure—phaseGdAl03powderwaso

7、btainedbycoprecipitationmethodthroughsinteringat1000℃麗tllthepreservationtimeof2hours，theaveragegrainsizeofthepowderwasabout100amThroughtlleSEMobservationwefoundthatthepowershassmallsizeandgooddispersionbythispreparedmeth

8、odThesinteringexperimentsindicatedthatthesinteredcompactWasinhighdensification，WeadoptedArrheniusformulatocalculatethesinteringactivationenergyforGdAl03，theresultswere379kJ／moland547kJ／molrespectivelyonthebasisofshrinkag

9、eandrelativedensityTostudythethermalexpansionbehaviorsduringthesinteringprocessforocA1203dopedwithdifferentconcentrationsofGdj’‘thefinalshrinkageofthesamplesincreasedwiththeenhancementofGdjcontenttheaverageparticlesizeso

10、fthesamplesreduced，舔wellasthetempertuareofthesamplesbegantoshrinkwasrisingTheresultsofthethermalexpensionexperimentsforsamplesshowedthattheaveragelineexpansioncoe伍cientsandtheexpansionmaximumofthesinteredcompactswerehigh

11、erthanthegreencompactsThenoveltyofthisarticleisthatpreparationsofGdAl03Bycoprecipitationmethod，theaveragegrainsizeofthepowderwassmallerandthesinteredcompactWasinhiglldensificationThereisneportaboutthes缸eringbehaviorandth