Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

A Comparative Study on the Properties of Cu-Cr-Mo System Electrical Contact Material by Sintering and Infiltration Method

Version 1 : Received: 8 September 2020 / Approved: 9 September 2020 / Online: 9 September 2020 (09:33:44 CEST)

How to cite: Cho, Y.; Sim, J.; Heo, S.; Byeon, J.; Lee, K.; Kim, T.; Seo, S.; Park, K. A Comparative Study on the Properties of Cu-Cr-Mo System Electrical Contact Material by Sintering and Infiltration Method. Preprints 2020, 2020090203 (doi: 10.20944/preprints202009.0203.v1). Cho, Y.; Sim, J.; Heo, S.; Byeon, J.; Lee, K.; Kim, T.; Seo, S.; Park, K. A Comparative Study on the Properties of Cu-Cr-Mo System Electrical Contact Material by Sintering and Infiltration Method. Preprints 2020, 2020090203 (doi: 10.20944/preprints202009.0203.v1).

Abstract

The contact materials in high-voltage vacuum interrupter require properties such as high conductivity, high density, and high hardness to minimize arc heat damage. In this study, copper–molybdenum-chromium alloys contact materials are examined for a high voltage contact material. Ball milling process was carried out after analyzing the raw materials of copper, chromium, and molybdenum powders. A green compact was produced using a high press with the mixed powder. Afterwards, composite was produced by sintering method according to temperature and infiltration method according to Cu content in green compact. The composite of sintering method showed a density of 8.55 g/cm3 (relative density 93%) a hardness of 217 HV, and an electrical conductivity of 40.7 IACS% at 1200 °C. The composite of 10 wt.% Cu produced by the Cu infiltration method showed a density of 8.7 g/cm3 (relative density 94%), Hardness of 274HV and electrical conductivity of 39 IACS% at 1300 °C. The measurements of physical properties showed the new possibility of using the Cu–Cr–Mo alloy as a contact material for high-voltage vacuum interrupters.

Subject Areas

Electrical contact material; Cu–Cr–Mo; Liquid phase sintering; Infiltration method; Hardness; Electrical conductivity

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