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时间:2020-04-30
《Al电子封装材料的组织与性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第4期北京科技大学学报VO1.36No.42014年4月Journ~ofUniversityofScienceandTechnologyBeijingApr.2014伪半固态触变成形制备SiCp/Al电子封装材料的组织与性能郭明海,刘俊友¨,贾成厂¨,果世驹¨,李艳霞,周洪宇1)北京科技大学材料科学与工程学院,北京1000832)北华航天工业学院材料系,廊坊065000园通信作者,E-mail:qi~ng—guo@126.eonl摘要采用伪半固态触变成形工艺制备了40%、56%和63%三种不同SiC体积分数颗粒增强Al基电子封装材料,并借助光学显微镜
2、和扫描电镜分析了材料中Al和SiC的形态分布及其断口形貌,测定了材料的密度、致密度、热导率、热膨胀系数、抗压强度和抗弯强度.结果表明,通过伪半固态触变成形工艺可制备出的不同SiC体积分数Al基电子封装材料,其致密度高,热膨胀系数可控,材料中Al基体相互连接构成网状,SiC颗粒均匀镶嵌分布于Al基体中.随着SiC颗粒体积分数的增加,电子封装材料密度和室温下的热导率稍有增加.热膨胀系数逐渐减小,室温下的抗压强度和抗弯强度逐渐增加.SiC/A1电子封装材料的断裂方式为SiC的脆性断裂,同时伴随着Al基体的韧性断裂.关键词电子封装;颗粒增强复合材料;触变成形;热导率
3、;热膨胀;材料强度分类号TN405MicrostructureandpropertiesofSiCp/Alelectronicpackagingmaterialsfabricatedbypseudo-semi-solidthixoformingGUOMing.hal旧,,』『UJun—you‘,J1aCheng—chang¨,GUOShi~u¨,LIYah—xia2,ZHOUHong—yu1)SchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beiji
4、ng100083,China2)DepamnentofMaterials,NoAhChinaInstituteofAerospaceEngineering,Langfang065000,China园Correspondingauthor,E—mail:qi~ngguo@126.con—ABSTRACTSiCparticlesreinforcedAlmatrixcompositeswiththreedifierentSiCvolumefractionsO40%.56%and63%forelec—troniepackagingwerepreparedbypseu
5、do—semi—solidthixoforming.TheA1andSiCdistributionandthefractographsoftheSiCp/A1electronicpackagingmaterialswereexaminedbyopticalmicroscopyandscanningelectronmicroscopy.Thedensity,relativedensity,thermalconductivity(TC),coeficientofthermalexpansion(CTE),compressivestrengthandbending
6、strengthoftheSiC:p/A1elec—tronicpackagingmaterialsweretested.ItisfoundthattheSiCp/A1electronicpackagingmaterialshavecontrollablecoeficientsofther—inalexpansionandhighrelativedensity.TheA1matrixisconnectedintoanetwork,andSiCparticlesareuniformlydistributedintheAImatrix.WhentheSiCvol
7、umefractionincreases,thedensityandthermalconductivityatroomtemperaturelightlyincrease,theeoeGficientofthermalexpansiongraduallydecreases,andthecompressivestrengthandbendingstrengthincrease.ThemainfracturemodeoftheSiC/A1electronicpackagingmaterialsisbrittlefractureofSiCparticlesacco
8、mpaniedbyductilefractureof
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