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The research of arc erosion Characteristics of AgWC30 electrical contact material
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Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals,Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal,Kunming Institute of Precious Metals

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    Abstract:

    The generation mechanism of arc erosion is a key problem in the research of electric contact materials. Arc erosion characteristics of AgWC30 electrical contact material are investigated under direct current 25A and voltage in 20V, 25V, 30V, 35V respectively. The images of breaking arc light are obtained by a high-speed camera to deduce the forming regularity of arc evolution. The arc formation processes in different voltages are similar and go through three stages, including forming stage, steady burning and discharge quenching stage. On the other hand, the bullet-shaped convex, pore, crack and starchiness coagulum structure are observed on erosion surface of contacts under scanning electron microscopy (SEM). The bullet-shaped convex is formed in the break off of liquid bridge and is formed by the WC skeleton and Ag cladding. The results indicate that the liquid bridges occur allowing with the arc discharges and is promoted under the action of the arc heat flow.

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[Ren Xianli, Chen Song, Li Muyang, Xie Ming, Chen Jinghong, Wang Saibei, Li Aikun, Liu Mangmeng. The research of arc erosion Characteristics of AgWC30 electrical contact material[J]. Rare Metal Materials and Engineering,2017,46(11):3345~3351.]
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History
  • Received:August 25,2015
  • Revised:December 17,2015
  • Adopted:January 14,2016
  • Online: December 13,2017

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