復合摻雜錳酸鑭陶瓷及其性能研究.pdf

1、北京交通大學碩士學位論文復合摻雜錳酸鑭陶瓷及其性能研究姓名：邢希申請學位級別：碩士專業(yè)：材料加工工程指導教師：周洋201106ABSTRACTABSTRACT：DopedLaMn03ceramicsshowedtemperaturedependentmetalinsulator(MDandparamagnetic—ferromagnetic口M—FM)phasetransitionincertainconditionsAfterthis

2、transitionthepropertyofinfraredemissivityappearsdifferentlyWh011thetemperatureisabovethetransformationtemperaturesthec鐓Rmicsshowshi曲infraredemissivity謝tll900dheatdissipationperformanceHoweverwhenthetemperatureisbelowthet

3、ransformationtemperature，itshowsreverselyNowdopedLaMn03ceramicshasbeC0n塢thehotspotofintelligencethermalcontrolmaterialsathomeandabroadbecauseitcouldchangeitsinfraredemissivityaccordingtothetemperatureThispaperexploredthe

4、preparationofthedopedLaMnChmaterialsandresearchedthecrystalstructuremechanicalpropertyinfraredemissivityandphasetransitiontemperatureofthedopedLaMn03materialsinordertofindtherelationshipsamongcomponentprocessstructureand

5、performanceThestudyincludes：(1)ThesynthesisprocessofhighpuritypowderofLaMnlyBy03(B=Fe，Ti)。andL觚825Sro1袖血lyB—03(B=Fe，Ti)(2)ThesinteringprocessofhighqualitybulkofLaSnlySy03陋FeTi)andLao825Sro175MIllyBy03∞Fe勱(3)UsingXRD，SEMa

6、ndrelatedtestoquipmentstotestandanalyzethecrystalstructuredensityhardnessmicrostructmeinf瑚edemissivitypropertiesandphasetransitiontemperatureofmaterialsTheresultsshowthat：highqualitybulkofdopedLaMn03materialscanbeprepare

7、dbyappropriateprocess；dopingelementsanddopinginfluencethestructureofmaterials；thecrystalstructureof齜1yBy03(B=Fe，Ti)powderandLa0825Sro1面加lyBy03∞=Fe，Ti)powderarebotllHexagonalR3m[160](a=b≠c，口=∥=900，y=1200)；thecellvolumeisd

8、irectratiotolatticeconstantaandb，buthasinverseratio謝tlllatticeconstantc；thecellvolumeandthelatticeconstantofdopingatAandBsitearesmallerthanthoseofdopingatBsite；inadditiontheinfixedomissivityandphasetransitiontemperatures