高含量SiC颗粒增强铝基复合材料制备及性能研究

发布时间：2018-04-12 10:40

  本文选题：SiC颗粒 + 铝基复合材料　； 参考：《北京交通大学》2015年硕士论文

【摘要】：轻量化是我国高速列车发展的关键技术之一,开发出能够替代现有钢铁材料的新型轻质高强材料具有重要的理论和实际意义。制动盘作为车辆簧下重量的重要组成部分,采用铝基复合材料制备制动盘可以显著降低高速列车簧下重量。应列车轻量化的趋势需求,本文采用真空半固态搅拌铸造法研制出了颗粒含量高达40vol.%的SiCp/A356复合材料。本文主要研究了 复合材料制备工艺,并提出了“稀释法”40vol.%SiCp/A356制备高SiC颗粒含量铝基复合材料衍生材料的方式,即通过向高SiC颗粒含量铝基复合材料中加入不同量的补偿铝合金并进行二次搅拌制备各种SiC颗粒含量低于40vol.%的复合材料,对比了SiC颗粒含量分别为的衍生材料和直接搅拌制备的复合材料的力学性能及复合质量,研究结果表明：10vol.%、20vol.%、30vol.%在搅拌温度为580℃条件下,以1200rpm搅拌30分钟,通过金相观察,颗粒 在基体中得到很好的分散,SiC颗粒与基体之间界面结合良好,制备出的复合材料孔隙率为0.88%;向复合材料中加入基体合金0.7wt%的晶粒细化剂可以使组织晶粒更细小、SiC颗粒得到更好的分散。通过“稀释法”制备的复合材料衍生材料不论在力学性能还是复合质量方面 都优于直接搅拌制备的复合材料。衍生材料的SiC颗粒含量偏差和孔隙率存在“稀释效应”,即SiC颗粒含量越低,SiC颗粒含量偏差和孔隙率越低。SiC颗粒含量为20vol.%的衍生材料综合力学性能最好,抗拉强度为296MPa,延伸率为1.08%,硬度为121.5HB。复合材料断口显示,其断裂的方式以颗粒的断裂和基体的撕裂为主。本文成功制备了SiC颗粒含量高达40vol.%的 复合材料,研究了该SiCp/A356复合材料的制备工艺,提出了一种新的复合材料制备方法——“稀释法”,并分析了该方法的优势。
[Abstract]:Lightweight is one of the key technologies in the development of high-speed trains in China. It is of great theoretical and practical significance to develop new lightweight and high-strength materials that can replace existing steel materials.Brake disc is an important part of vehicle underspring weight. Using aluminum matrix composite to prepare brake disc can significantly reduce the underspring weight of high-speed train.In order to meet the demand of light weight of train, SiCp/A356 composites with 40 vol.% particle content were prepared by vacuum semi solid stirring casting.This paper mainly studiesThe preparation process of composite material and the method of "dilution method" 40vol.%SiCp/A356 for preparing high SiC particle content aluminum matrix composite derived materials were put forward.That is, by adding different amount of compensated aluminum alloy to the aluminum matrix composites with high SiC particle content and making secondary stirring, various kinds of composites with SiC particle content less than 40 vol.% were prepared.The mechanical properties and composite quality of the derived materials with SiC particle content and the composites prepared by direct stirring were compared. The results showed that: 10vol.20 vol.530vol.% was agitated at 580 鈩，

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