Si-Al复合材料热膨胀系数的有限元计算方法研究  

Finite element study on thermal expansion coefficients of silicon-aluminium composite materials

作　　者：刘超[1] 浦玉萍[1] 沈伟[1] 赵鹏[1] 朱黎冉[1] 

机构地区：[1]钢铁研究总院,北京100081

出　　处：《粉末冶金技术》2012年第6期428-431,459,共5页Powder Metallurgy Technology

基　　金：中国钢研科技集团有限公司科技基金资助项目(事11040390A)

摘　　要：针对低膨胀系数的Si-Al复合材料,基于数字图像处理技术,建立与其显微组织照片相一致的有限元模型。利用有限元方法进行热载荷作用下的稳态应变场分析,根据热应变方程计算Si-Al复合材料微区的横、纵向热膨胀系数;统计Si-Al复合材料不同微区的横、纵向热膨胀系数,得到不同温度条件下的Al-50%Si(质量分数)热膨胀系数的有限元预测结果。有限元预测结果与实验测试结果吻合良好,揭示了Si组元分布对Si-Al复合材料热性能的影响,为Si-Al复合材料的热性能预测提供了新的研究手段。The finite element models according with the actual microstructure were buih based on digital image processing for silicon-aluminium composites with low thermal expansion coefficient. The steady-state strain field under thermal loads was analyzed using finite element method, subsequently, the horizontal and vertical thermal expansion coefficients of silicon-aluminium composites micro-areas were calculated by the thermal strain equation. The finite element predictions of A1-50% Si thermal expansion coefficient at different temperatures were obtained from the statistics of horizontal and vertical thermal expansion coefficients in different micro-zones. The finite element prediction shows good agreement with experimental test results, which reveals the influence of Si element distribution on the thermal properties of the composites. It is a new research method of the thermal performance prediction for silicon-aluminium composites.

关 键 词：Si-Al复合材料 数字图像处理技术 有限元 热膨胀系数 

分 类 号：TQ174.758[化学工程—陶瓷工业]