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在实验和理论分析的基础上,提出了铜的氧化过程不是由单纯的扩散控制,而是分为三段:前期由化学反应控制;中期由化学反应与扩散混合控制;后期受扩散控制。比较了不同稀土加入量,不同稀土添加剂(La、Ce、Nd、Y)对导电铜的氧化速度影响;认为最佳稀土加入量为0.4%左右;在本实验中所选用的添加剂以釔为最好。另外,还研究了稀土对铜中杂质分布规律,以及对氧化膜结构的影响;讨论了稀土提高铜抗氧化能力的机理。
Based on the experimental and theoretical analysis, it is proposed that the oxidation of copper is not controlled by simple diffusion, but divided into three stages: the first is controlled by chemical reaction; the second is controlled by mixed chemical reaction and diffusion; the second is controlled by diffusion. The effects of different rare earth additions, different rare earth additives (La, Ce, Nd, Y) on the oxidation rate of conductive copper were compared. The optimal addition amount of rare earth was about 0.4%. In this experiment, it is good. In addition, the distribution rules of rare earths on copper impurities and their effect on the structure of oxide films were also studied. The mechanism of rare earths’ anti-oxidation ability of copper was discussed.