同步热分析仪(STA)热重英文介绍.ppt

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1、SynchronousThermalAnalyzer同步热分析仪（STA）1IntroductionContents1Principle2Structure3Operation&Maintenance4Application52IntroductionThermalAnalysis(TA)STAisbasedonthermalanalysis1915Japan本多光太郎thermo-balance（热天平）Recentyearscontrolledbycomputer、highautomationandmorepreciseCombinationwithother

2、instrumentsTG-MS、TG-GC、TG-FTIRetc.3IntroductionMassThermogravimetry(TG)DifferentialThermogravimetry(DTG)TemperatureHeating-curveDetermination(HCD)DifferentialThermalAnalysis(DTA)EnthalpyDifferentialScanningCalorimetry(DCS)4PrincipleTGAtacertaintemperature,theweightofthematerialwillcha

3、ngebecausesomeingredientsofthesubstancewillbedecomposedorremoved.TGisusedtomeasuretherelationshipbetweentheweightofmaterialandtemperaturechangesunderprogram-controlledtemperaturechange.Thermogravimetriccurveisrecorded,qualityastheordinateandtemperatureasabscissa.m=f(T或t)DTGDifferentia

4、lthermogravimetriccurve(DTGcurve)isobtainedbydifferentialprocessingofTGcurve.dm/dt=f(T或t)5ThermalbalanceThermalbalanceisthemostimportantpartoftheSTAinstrument.Theprincipleofthermalbalanceissimilarwithwhichofbalance.Itcanmeasuretheweighofsamplecontinuouslyintheconditionofheatingandreco

5、rdtherelationshipbetweenchangesofsampleweightandtemperaturecontinuously.Principle6StructureSTA同步热分析仪HeatingfurnaceControlsystemoftemperatureThermalbalanceMassflowmeterSignaldetectionandrecordsystem7OperationWeighingsamplesProgram1Specialcrucible210±0.1mg3ZerosampleWeighsample1Initials

6、tate2Purgegas3TemperatureprogramwithgasswitchOnandOFF1Turnon/Offallinstruments2Open/Closethegascylinder3Connect/Disconnectthecomputer8attentionMaintenance1.Useethanoloracetonetowipetheinsidesurfaceofthefurnace.2.Runtheheatingprogramto900℃withnosampleanduseairasthepurgegas.3.Washthecyl

7、indersusingultrasoniccleaner,theheatthemat900℃.4.Replacetheglasscottonpiece.No.1Keeptheoutersurfaceofthecrucibleclean.No.2Don’tsprinklethesampleontheoutside.No.3Don’tturnofftheinstrumentwhenthesampletemperatureishigherthan100℃.No.4etc.Maintenance9ApplicationTG1.Processandmechanismofth

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