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研究稀土元素La对铜合金的电弧侵蚀行为和氧化行为的影响。结果表明:稀土元素La的加入有利于铜合金抗氧化性能和电弧侵蚀性能的改善,并有效地降低了接触电阻和温升。通过对CuLa合金的高温抗氧化性能机理分析表明,富集在晶界的La元素形成La_2O_3或者CuLa合金,起到了界面包裹的作用,从而抑制了铜的进一步氧化。通过热力学计算可知,CuLa合金中的La择优氧化形成La_2O_3,对铜基体起到了保护作用。动力学分析表明,CuLa合金的激活能较纯铜的高,说明其抗氧化性能更好。
The effect of rare earth element La on the arc erosion behavior and oxidation behavior of copper alloy was studied. The results show that the addition of rare earth element La is beneficial to the improvement of oxidation resistance and arc erosion performance of copper alloy, and effectively reduces the contact resistance and temperature rise. The analysis of the mechanism of the high temperature oxidation resistance of CuLa alloy shows that the La element enriched in the grain boundary forms the La_2O_3 or CuLa alloy and plays the role of interface wrapping and thus inhibits the further oxidation of copper. Through the thermodynamic calculation, it can be seen that La preferentially oxidizes La 2 O 3 in CuLa alloy to protect the copper matrix. Kinetic analysis shows that the activation energy of CuLa alloy is higher than that of pure copper, indicating that its oxidation resistance is better.