玻璃膠低溫分解粘結(jié)劑

1、TheBenefitsofPolyalkyleneCarbonateBinders(QPAC)fLowTemperatureGlassFritPowderedGlassinLowTemperatureProcessedThickFilmApplicationsP.Ferraro–EmpowerMaterialsNewCastleDES.HanggodoEmpowerMaterialsNewCastleDEAbstractQPAC40Po

2、ly(PropyleneCarbonate)PPCisanexceptionalbinderfuseinlowtemperaturefiringthickfilmpastesbecauseitdecomposesatlowtemperaturesleavingminimalresidueafterdebind.Thebinder’slowdecompositiontemperatureallowsfbinderthermolysisat

3、temperatureswellbelowthesinteringtemperatureofglassmetalpowdersthatareusedinultralowfiringthickfilmapplications.Thepotentialfdramaticallyreducedlevelsofremnantcarbonafterthermalprocessingenablesimprovementinthemechanical

4、opticalelectronicpropertiesofafiredthickfilmdevice.AdditionallyitisproposedthattheuseofcleanburnoutQPACbinderswillenableincreasedutilizationofthermalprocessingequipmentwillresultinareductioninperiodicmaintenancefremovalo

5、fbindertarsthelikefrommanufacturingthermalprocessingequipmentbothwhichwillreducemanufacturingcostsassociatedperdevicecosts.InthispaperglasspastesusingQPACPPCcarbonatebinderswerestudied.Thermalanalysesoftherateofdebinding

6、ofthickfilmglasspastesmadewithultralowfiring(420oC)glasswereperfmedcomparedwithanalogousthickfilmpastesmadewithothercommonthickfilmbindersaswellasacommerciallyavailableultralowfirethickfilmpaste.Rheologicalpropertiesofth

7、econstituentbindervehiclesaswellastherespectivethickfilmpasteswerealsoevaluatedcompared.TheresultingfiredthickfilmsampleswerealsovisuallyinspectedtheQPACfiredthickfilmsmostcloselyresembledthecolofthefiredneatglasspowderw

8、hilethefiredthickfilmsmadefromothercommonthickfilmbindersweremuchdarkerindicatinghighlevelsofremnantcarbonpossiblychemicalreductionoftheultralowfiringglass.Theseobviousadvantagescanbeappliedtonumerouslowfirethickfilmappl

9、icationsincludingglasspackagingsolderglasssealingglassesphosphsdopantsothersolarcelldevicedisplaysealingapplications.IntroductionManydifferentelectronicopticalproductsutilizethickfilmtechnologyintheirrespectivemanufactur

10、eincludingbutnotlimitedtoplasmadisplaysceramicpackaginghermeticpackagingceramiccircuitselectronicchipcomponentssolarcellsmicroelectromechanicalsystems(MEMS).Residualcarboninprocessedphosphsutilizedinplasmadisplayswasfoun

11、dtoberesponsiblefareductioninemissionintensityofasmuchas20%3hasbeenattributedtoareductionintheopticaltransmissionofglass.4Residualcarbonimpuritiesmayinfluencemagicpropertiesofceramicmaterials5alsohasbeenfoundtoreduceresi

12、stivityofceramicinsulatingmaterials.Fexampleresidualcarboninbariumtitanatebaseddielectricfmulationshasbeenfoundtodramaticallyincreaseconductivityoftheinsulatingmaterialinmultilayerceramiccapacitapplications.67Ingeneralme

13、than100ppmresidualcarbonisthoughttoberioustoatleastoneelectricalpropertyofathickfilmceramicinsulatingmaterial.ItistheintentofthisstudytointroducetheQPAC40PPCbindersystemtothelowfireultralowfirethickfilmindustryindertoadd

14、ressissuesofresidualcarboncontaminantsintroducedbycurrentthickfilmbinders.Themostcommonlyusedbindersfmakinglowfirethickfilmglasspastestheresultingglasscontainingthickfilmdevicesarebinderchemistriesbasedoneitherethylcellu

15、lose(EC)acrylic(AC)chemistries.ThematerialspropertiesoftheECACQPAC40evaluatedinthisstudyareillustratedinTable1below.Table1:BinderpropertiesBinderQPAC40PPCECACMW300000NA142000Density1.281.121.06nbutylmethacrylatePolyalkyl

16、eneCarbonate[CH(CH)3CH2OCO2]nissynthesizedthroughthepolymerizationofcarbondioxideepoxides.ThesynthesisprocessfPPCisenvironmentallyfriendly(green).QPAC40PPCisacollessthermoplasticpolymerwithlowglasstransitiontemperature.Q

17、PAC40PPCbindersareavailableinabroadrangeofmolecularweights.AsshowninFigure1belowthedecompositionofPPCpolymerstakesplaceatalowertemperaturethaneitherethylcellulose(EC)acrylicbinders(AC)thatarecommonlyusedbindersinthickfil