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
诸旭伟 1金云学 1周灿旭 2刘源2
作者信息
- 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
- 折叠
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.
Abstract
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 compos-ites consists of Si phase and α-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Key words
Si/Al Composites/Pressure Seepage Method/Hot Pressing引用本文复制引用
出版年
2024
NETL
NSTL
万方数据