中文摘要：

本文采用数值模拟研究了Cu-Al复合粉体的内氧化热力学和动力学过程,分析了时间、温度、粉体粒度和Al含量对内氧化动力学的影响。结果表明：Cu-Al复合粉体内氧化反应的氧分压要控制为低于上临界值,下限氧分压是一个极小量,对于内氧化控制无实际意义;Cu-Al粉体的内氧化反应主要在最初较短时间内完成,其内氧化程度、速率主要取决于温度、粉末粒度、Al含量和时间,在较高的温度下有利于提高内氧化的程度和速度。实验证明Cu-0.5%Al复合粉在900℃下、30 min内即可完成内氧化生成Cu-Al2O3复合粉体,与数值模拟的结果相一致。

英文摘要：

In this paper,the thermodynamics and kinetics of internal oxidation of Cu-Al composite powders were studied based on numerical simulation,and the effects of time,temperature,particle size and Al content on the oxidation kinetics were analyzed. The results show that the oxygen partial pressure for the internal oxidation reaction of Cu-Al composite powder should be controlled to be lower than that of the upper critical oxygen partial pressure,the lower limit of oxygen partial pressure is a very small amount,it has no practical significance for the internal oxidation control. The internal oxidation of Cu-Al powder is mainly completed in the initial short period of time. The degree and rate of oxidation depend on temperature,particle size,Al content and time,and high temperature is beneficial to improve the degree and speed of oxidation. The experiments show that the Cu-Al_2O_3 composite powder is generated by the internal oxidation at 900℃ for 30 min,and the results are in agreement with that of numerical simulation.