Effect of Rare Earth La on Conductivity and Oxidation Resistance of Cu-25Cr-La Alloy AITranslate

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Chinese Library Classification Number:TG146.1[金属学及工艺—金属材料]

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Cu-25Cr-La alloy was prepared using powder metallurgy method,and the effects of rare earth La content on the conductivity and oxidation resistance of the alloy were investigated,as well as the microstructure and phase composition of the alloy oxide layer after La addition.The results indicate that as the La content increases,the conductivity of Cu-25Cr-La alloy gradually decreases while its oxidation resistance improves.When the mass fraction of La is 0.3%,the alloy exhibits optimal comprehensive performance.After oxidation at 800℃ for 10 h,the oxide layer of Cu-25Cr alloy exhibits cracks and spallation,whereas the oxide layer of Cu-25Cr-0.3La alloy remains relatively dense with minor cracks.The oxidation kinetic curve of the latter primarily follows a cubic law,and the oxide layer is mainly composed of CuO and Cr₂O₃.