Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 27    No. 1    January 2017

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Effect of La on arc erosion behaviors and oxidation resistance of Cu alloys
Hai-yan LI1, Xuan ZHOU2, Xue-qiong LU1, Ya-ping WANG1,3

1. Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Ministry of Education,School of Science, Xi’an Jiaotong University, Xi’an 710049, China;
2. Department of Electrical and Computer Engineering, Kettering University, Flint, MI-48504, USA;
3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

Abstract:Cu with and without La addition was prepared and the effect of a trace amount of La on the arc erosion behaviors and oxidation resistance of Cu alloys was investigated. The results indicate that CuLa alloy exhibits superior oxidation resistance and arc erosion resistance. The contact resistance and temperature rise were obviously improved. The oxidation resistance of CuLa alloy mainly is due to the interface wrapping of La2O3 particles and CuLa alloy phase on Cu atoms. Thermodynamic calculation indicated that La2O3 could form preferentially in the CuLa alloy, which was beneficial for the protection of the Cu substrate. According to kinetics analysis, the activation energy of CuLa alloy was higher than that of pure Cu, indicating the better oxidation resistance of CuLa alloys.

 

Key words: CuLa alloy; arc erosion; contact resistance; oxidation; interface wrapping

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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