Advanced hermetic electronic packaging based on lightweight silicon/aluminum composite produced by powder metallurgy technique  

作　　者：Yan-Qiang Liu Jian-Zhong Fan Xin-Xiang Hao Shao-Hua Wei Jun-Hui Nie Zi-Li Ma Ming-Kun Liu Ya-Bao Wang 

机构地区：[1]National Engineering and Technology Research Center for Nonferrous Metals Composites,General Research Institute for Nonferrous Metals,Beijing,100088,China

出　　处：《Rare Metals》2020年第11期1307-1313,共7页稀有金属（英文版）

基　　金：the National Basic Research Program of China(No.2012CB619600)。

摘　　要：Silicon/aluminum(Si/Al)composite is a kind of lightweight electronic packaging material that received a lot of attention in the past 20 years.In this paper,a series of Si/Al composites with lowered coefficient of thermal expansion(CTE)and high thermal conductivity were produced by powder metallurgy(PM).The Si/Al composites are fully dense and have fine Si particles uniquely distributed within pure Al matrix.Three 50%Si/Al composites were designed to have strength in the range of 185-290 MPa to meet different demands,while the other properties keep invariable.Fracture toughness of the composites is measured to be 9-10 MPa·m^(1/2).The composites were machined to 50%Si/Al housings and 27%Si/Al lids.Both the hermeticities of housings before and after laser-beam-welding sealing are determined.The measured leak rate of composites and sealed housings is in magnitude order of 1×10^(-10)and 1×10^(-9)Pa·m^(3)·s^(-1),respectively,suggesting high hermeticity.The good hermeticity is attributed to the full dense materials,good weldability,and extremely low weld porosity.The present Si/Al composites are expected to be extensively used in highly hermetic electronic packages.

关 键 词：Si/Al composite Electronic packaging STRENGTH Hermetic Powder metallurgy 

分 类 号：TB333[一般工业技术—材料科学与工程]