压力渗流法制备Si/Al复合材料的组织与性能  

Microstructure and Properties of Si/Al Composites Prepared by Pressure Seepage Method

作　　者：诸旭伟 金云学[1] 周灿旭 刘源[2] Zhu Xuwei;Jin Yunxue;Zhou Canxu;Liu Yuan(School of Materials and Science Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100;School of Materials and Science Engineering,Tsinghua University,Beijing 100084)

机构地区：[1]江苏科技大学材料与科学工程学院,镇江212100 [2]清华大学材料学院,北京100084

出　　处：《特种铸造及有色合金》2024年第5期627-632,共6页Special Casting & Nonferrous Alloys

摘　　要：采用压力渗流法制备了Si体积分数为62.1%~75.6%的Si/Al复合材料,研究了Si含量、Si粉粒径和热压处理对复合材料组织和性能的影响。结果表明,制备的Si/Al复合材料的相组成为Si相和α-Al相,其热导率和热膨胀系数均随着Si的体积分数增加或Si的粒径减小而降低,热导率最高可达136 W/(m·K),热膨胀系数最低为7.75×10^(-6)K^(-1);600℃热压处理后复合材料初生Si尖角明显钝化,热导率从119 W/(m·K)提高到125 W/(m·K),热膨胀系数从8.28×10^(-6)K^(-1)提高到8.73×10^(-6)K^(-1)。Si/Al composites with Si volume fraction of 62.1%to 75.6%were prepared by pressure seepage method,and effects of content and particle size of Si powder in Al matrix and hot-pressing treatment on the microstructure and properties of the composites were investigated.The results indicate that the microstructure of prepared Si/Al composites consists of Si phase andα-Al phase,and the thermal conductivity and thermal expansion coefficient are decreased with the increase of Si volume fraction or reduction of Si particle size,which reach the maximum value of 136 W(/m·K)and the mininum value of 7.75×10^(-6)K^(-1),respectively.After hot-pressing at 600℃,the sharp corners of the primary Si are obviously passivated,where the thermal conductivity is increased from 119 W(/m·K)to 125 W(/m·K),and the coefficient of thermal expansion is increased from 8.28×10^(-6)K^(-1) to 8.73×10^(-6)K^(-1).

关 键 词：Si/Al复合材料 压力渗流法 热压处理 

分 类 号：TB331[一般工业技术—材料科学与工程]