Vacuum Breakdown Behavior of CuWCr Composites


Article Preview

The Cu20W70Cr10 composites were fabricated by two methods which are the conventional powder metallurgy, and mechanical alloying to prepare WCr compound powders, followed by sintering and infiltration. The erosion behavior of CuWCr composites under breakdown was investigated. The surfaces of the composites before and after erosion and the mechanism of arc erosion were studied by scanning electron microscopy. The results show that the CuWCr composites prepared by mechanical alloying have superfine microstructure, uniform composition and high density, thus result in good characteristics of diffusing arcs and arc eroding endurance. Arc erosion zones are dispersive and uniform on the surfaces with some flat eroding pits. The Cu20W70Cr10 composites have excellent electrical properties such as high breakdown voltage, low chopping current and long arc life.



Edited by:

Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee




P. Xiao and Z. K. Fan, "Vacuum Breakdown Behavior of CuWCr Composites ", Materials Science Forum, Vol. 569, pp. 125-128, 2008

Online since:

January 2008




[1] G.G. Lee, G. H Ha and B. K Kin: Powder Metal. 43(2000), p.79.

[2] G. Paul. Slade, Fellow: IEEE Transactions on components Packaging, and Manufacturing technology. 17(1994), p.96.

[3] Zhikang. Fan, Shuhua. Liang and Xu. Xue: Nonferrous Met. Soc. China. 11(2001), p.835.

[4] P. Frey, N. Klink, R. Michal and K.E. Saeger: IEEE Trans. Plasma Sci. 17(1989), p.734.

[5] Chengyu Zhang, Yaping Wang, Zhimao Yang, Yong Guo ang Bingjun Ding: Microstructure and properties of vacuum induction melted CuCr25 alloys. 366(2004), p.289.


[6] K. Ozawa, K. Matsumoto, T. Nakanishi, K. Yoshigae, M. Yamazaki and H. Shinohara: In Proc. Int. Conf. on Electrical Contacts, Electromechanical Components and their Applications. (1986), p.823.

[7] H. Kippenberg: 13th Int. conf. on Electric Contacts, Zurich. (1986), p.140.

[8] M B Shulman, P G Slade, L D Loud and W Li: IEEE Transactions on components Packaging, and Manufacturing technology, 22(1999), p.405.

[9] Zhikang. Fan, Shuhua. Liang, Hongwang. Yang and Peng. Xiao: Trans Nonferrous Met Soc China, 13(2003), p.267.

[10] Peng. Xiao, Shuhua. Liang, Weibing. Zhao, Zhikang. Fan: Key Engineering Materials, 334-335(2007), p.173.

[11] Peng. Xiao, Shuhua. Liang, Qingyan. Peng, Zhikang. Fan: Key Engineering Materials, 334-335(2007).