Al-Zr(CO_3)_2体系熔体反应合成(Al_3Zr+Al_2O_3)/Al复合材料的热力学与动力学机制  

Study on Thermodynamics and Kinetic Reaction Mechanism of (Al_3Zr+Al_2O_3)/Al Composites Synthesized by the Direct Melt Reaction in the System Al-Zr(CO_3)_2

作　　者：朱延山[1] 赵玉涛[1] 戴起勋[1] 程晓农[1] 李桂荣[1] 冯钦[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《铸造》2005年第5期446-449,共4页Foundry

基　　金：国家教育部重点基金项目(2000156);江苏省科技攻关项目(BE2002039);江苏省高校高新技术产业发展项目(JH020);江苏省铝基复合材料工程技术研究中心项目(BM2003014)

摘　　要：开发了Al Zr(CO3)2原位反应新体系,采用熔体反应法成功制备了颗粒增强铝基复合材料。X射线衍射(XRD)及扫描电镜(SEM)分析可知,该体系生成的复合材料增强相颗粒细小(≤2μm)、形状圆整、弥散分布于基体中。反应热力学和动力学分析结果表明,反应起始温度和反应时间是影响反应和扩散的重要因素:反应起始温度越高,反应时间越长,越有利于反应的进行和颗粒的扩散;但随温度的升高和时间的延长,颗粒有长大的倾向。In-situ ZrAl3 and Al2O3 particulate reinforced aluminum matrix composites were fabricated by the direct melt reaction method in the system Al-Zr (CO3)2. The microstructure of these composites was analyzed by using scanning electron microscope (SEM) and X-ray diffraction (XRD). It is shown that particulate reinforcements are well distributed in the matrix and are finer size. The thermodynamics and kinetic mechanism were also discussed. It is proved that it is helpful for the reaction and particle dispersion to enhance the initial reaction temperature or to increase the reaction time, but the aggregation and growth of particles are caused when the melt temperature is excessively high or reaction time is long.

关 键 词：原位反应 热力学 动力学 铝基复合材料 

分 类 号：TB331[一般工业技术—材料科学与工程]