doi:10.3963/j.issn.1674-6066.2023.05.002硅凝胶/氧化铝导热片的制备及其导热性能研究裴绍颖1,曹宇1,吴盖1,尹陈麟1,李若尘2,刘婧1(1.蚌埠中恒新材料科技有限责任公司,蚌埠233030;2.凯盛科技股份有限公司,蚌埠233030)摘要:球形Al2O3粉体是一种粒径在纳米级到毫米级的白色球形颗粒状化工原料。该文采用硅凝胶与氧化铝粉体制备了硅凝胶/氧化铝导热片,考察了不同硅烷偶联剂表面处理、不同粒径的Al2O3对制备的导热片导热系数的影响。结果表明,随着球形Al2O3粒径变大,导热片的导热系数逐渐增大,不同粒径的Al2O3可以更大程度的实现填料在机体中的紧密堆积,小颗粒填充到大颗粒的孔隙,在基体中形成的紧密堆积降低了相邻大颗粒之间的界面热阻。硅烷偶联剂改性后的Al2O3制备导热片的导热系数可以达到3.0653W/(m·K),高于未改性前(2.6861W/(m·K))。关键词:硅凝胶;球形Al2O3;导热;硅烷偶联剂;粒径复配StudyonPreparationandThermalConductivityofSiliconGel/Al2O3ThermalConductiveSheetPEIShao-ying1,CAOYu1,WUGai1,YINChen-lin1,LIRuo-chen2,LIUJing1(1.BengbuZhonghengNewMaterialTechnologyCo,Ltd,Bengbu233030,China;2.TriumphScience&TechnologyCo,Ltd,Bengbu233030,China)Abstract:SphericalAl2O3powderisawhitesphericalchemicalrawmaterialwithparticlesizesrangingfromnanometerstomillimeters.Inthisarticle,silicongel/aluminumoxidethermalconductivesheetwaspreparedbyusingsilicongelandaluminumoxidepowder.TheinfluenceofdifferentsilanecouplingagentsurfacetreatmentanddifferentparticlesizeAl2O3onthethermalconductivityofthepreparedthermalconductivesheetwasinvestigated.TheresultsindicatethatastheparticlesizeofsphericalAl2O3increases,thethermalconductivityofthethermalconductivitysheetgraduallyincreases.Al2O3withdifferentparticlesi-zescanachieveagreaterdegreeofcompactpackingoffillersinthebody,withsmallparticlesfillingtheporesoflargeparticles.Thecompactpackingformedinthematrixreducestheinterfacialthermalresistancebetweenadjacentlargeparticles.Thether-malconductivityofAl2O3preparedbysilanecouplingagentmodificationcanreach3.0653W/(m·K),whichishigherthanthatofunmodifiedAl2O3(2.6861W/(m·K)).Keywords:silicongel;sphericalAl2O3;heatconduction;silanecouplingagent;particlesizecompou...
