通过分析铜铝颗粒表面铝与氧的反应，计算铜铝合金中铝的沉淀析出量、铝在铜基体中的扩散速率以及Al2 O3颗粒大小，研究了喷射沉积内氧化法制备CuAl2 O3复合材料中 Al2 O3的长大动力学行为。结果表明，在反应合成制备过程中，氧化铝颗粒长大动力学行为满足抛物线规律；铜铝合金表面铝与氧的反应是一种铝扩散控制型反应，该氧化铝颗粒的长大与铝在铜铝合金中的含量、扩散速率和所处位置(晶内、晶界)有关。计算得到的 Al2 O3颗粒大小与实际获得的氧化铝颗粒大小相吻合。
The growth kinetics behaviors of Al2 O3 particles in CuAl2 O3 composites prepared by spray deposition internal-oxidation method were investigated by analyzing the reaction of aluminum and oxygen on the surface of a copper- aluminum alloy and calculating the precipitation amount of aluminum in the copper-aluminum alloy, the diffusion rate of aluminum in copper matrix and the size of Al2 O3 particles.It is indicated that the growth kinetics of Al2 O3 particles in the spray deposition internal-oxidation process follows a parabolic law,the reaction of aluminum and oxygen on the surface of the copper-aluminum alloy is controlled by aluminum diffusion,and the growth of Al2 O3 particles is influenced by the content,diffusion rate and location (grains or grain bounda-ries)of aluminum in the copper-aluminum alloy.The calculated size of aluminum oxide particles agrees with the measured one.
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