对高能球磨制备的Cu--Al预合金粉末中Al内氧化的工艺进行了研究。结果表明, 温度是决定临界氧分压P O2的关键因素, 随着温度的升高, 临界氧分压增加。 适当提高温度可以减小环境氧分压的控制难度。高能球磨制粉对Al内氧化的热力学条件影响不显著, 但对动力学条件影响显著。 当Al的质量分数大于0.5%时, 对于不同的Al含量的Cu--Al预合金粉末应有不同的加热工艺。当工艺参数适宜时, 采用Cu--Al预合金粉末可以制备出组织均匀的Al2O3/Cu复合材料, 其中Al2O3颗粒粒径2---5m,颗粒间距5---10m。
The internal oxidation technology of Al in Cu--Al pre—alloyed powders is discussed. The results show that the reacting temperature is a key factor to determine the critical oxygen partial pressure. The maximum oxygen partial pressure increases with increasing temperature, so that a little higher temperature than that of ordinary reaction is helpful to reduce the difficulty of controlling internal oxidation. High energy milling has little influence on the internal oxidation thermodynamics, however, remarkable influence on the internal oxidation kinetics. When the Al content exceeds 0.5\%, the heating parameters should be alternated based on Al content. It can be observed from the examinations of the samples that the spherical Al2O3particles with an average diameter size of 2---5 m and particles spacing of 5---10 m are dispersed in the Cu matrix uniformly, when used the suitable processing parameters of internal oxidation.
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