导热硅橡胶复合材料研究

27120072JOURNALOFAERONAUTICALMATERIALSVol27,No1February2007周文英,齐暑华,涂春潮,赵红振,吴波(,710072):,(3m,20m),,,0.92W(mK)-1,:;;;;:TB332:A:1005-5053(2007)01-0033-04:2005-09-18;:2006-09-20:(N3HB1811):(1971),,,(E-mail)[e-mail],,,,,(ThermalInterfacialMateria,lTIM),,40%,1,2,10%,50251/6[1],,,Al2O3,,0.92W(mK)-1,1实验部分1.11Fig.1SurfaceroughnessbetweenheatsinkanddevicefilledwithTIM,101B,;,;,,;a-Al2O3,3m20m,;,;,2.5--2.5-(DBPMH),;,2116,1.2:100g,30g,15g,0.5~1g,,(DBPMH),DB-PMH:100,,,27,,,,,,:16556~10MPa,1901h+2502h,1.3:SK-160B,;:SL-45,;:ZMGI250,;A:;:KT-6,:ZC36,;:S914,;:TNC,;:DNJ-1,;:,;TGA:Q50,DSC:MDSC2910,TA1.4GB/T5281992;GB/T5311992;GB/T112051989;GB/T16921992;:GB16941989;CTEGB1036892结果与讨论TIM(CTE)2.1,,,,;,,,,,;,,,,;,,[32W(mK)-1][0.2W(mK)-1],,,,[2]20m3m,3/2,22,,60,,,,,,,;,,,,,,3/2,,,,,,,140,,,,11202Fig2Thermalconductivityofsiliconerubberasafunctionofamountofhybridalumina1Table1Effectofhybridmicro-Al2O3particlecontentsonmechanicalpropertiesofsiliconerubberAl2O3/phrTensilestrength/MPaElongationatbreak/%ShoreAhardness801.02123481001.14101561201.2786781401.0678823412.2DSC,1203,,1,13,3W/g,,3Fig3DSCcomparisonbetweenunfilledsiliconerubberandaluminafilledsiliconerubber2.3CTE,810-6/,,CTE4,120CTE3TIMCTE,CTE,[3,4]4Fig4EffectoftheamountofAl2O3ontheCTEoffilledsiliconerubber2.4,,,,5,120,,5Fig5TGAoffilledsiliconerubber2.590#,0.5~0.8Pas,,,,,,,[5],22Table2PropertiesofthermallyconductivesiliconerubberreinforcedwithelectricalfiberglassPhysicalPropertiesNo.1No.2Thickness/mm0.220.30Breakingstrength/MPa1818ShoreAhardness8080Continuoususetemp/-60~+180-60~+180Thermalconductivity/W(mK)-10.920.92Thermalresistance//W0.620.70Breakdownvoltage/kV4.55.0Dielectricconstant5.05.5Volumeresistivity/m210122.2101235273结论(1),,,120(2);CTE;(3)0.92W(mK)-1,,:[1],,.[J].,2005,52(1):118-123.[2]SIMLC,RAMANANSR,ISMAILH.Thermalcharacter-izationofAl2O3andZnOreinforcedsiliconerubberasther-malpadsforheatdissipationpurposes[J].ThermochimiaActa,2005,430(1-2):155-165.[3]JAMESRG,YVONNEYV,STEVENB.Theelectricalandthermalconductivityofwovenpristineandintercalatedgraphitefiber-polymercomposites[J].Carbon,2003,41(12):2187-2193.[4]XUYS,CHUNGDD,MROZC.Thermallyconductinga-luminumnitridepolymer-matrixcomposites[J].Compos-ites,PartA,2001,32(5):1749-1757.[5]GIUSEPPEPezzott,iIKUKOKamada.ThermalconductivityofAlN/polystyreneinterpenetratingnetworks[J].JEuroCeramicSoc,2000,20(8):1197-1203.ThermallyConductiveSiliconeRubberCompositesZHOUWen-ying,QIShu-hua,TUChun-chao,ZHAOHong-zhen,WUBo(DepartmentofAppliedChemistry,SchoolofScience,NorthwesternPolytechnicalUniversity,Xian710072,China)Abstract:Thethermalconductiveandelectricallyinsulatingsiliconerubberwaspreparedusingthemethylvinylsiliconerubberandheatconductivehybridaluminapowderwithtwodifferentparticlesizes.Theexaminationsofeffectsofaluminafillercontentonthether-malconductivity,mechanicalproperties,curingbehavior,coefficientofthermalexpansion(CTE)andheatstabilityofthesiliconerub-berindicatedthatthethermalconductivityandheatstabilityincreasedwithincreasingthefillercontent,whileCTEandmechanicalpropertiesdeclined;aluminahasaslightinfluenceonthecuringreactionofsiliconerubber.Inaddition,anoveltypeofelectricalf-iberglassreinforcedcompositesiliconerubberwiththermalconductivityof0.92W(mK)-1,goodelectricalinsulationandmechan-icalproperties,wasdevelopedbasedonthealuminafilledsiliconerubber.Thedevelopedcompositesiliconerubberisakindofidealthermalinterfacialmaterialsforheatdissipationofhigherperformancedevices.Keywords:siliconerubber;alumina;thermalconductivity;thermalinterfacialmateria;lCTE36