Method for preparing CuCr25 electrical contact

• Main Authors: ZHOU NING, CHEN MEI, YANG PING, WANG WENBIN, WANG WAN'GANG, ZHAO WEIPENG, WANG ZHEN, LI GANG, GUO CHUANGLI
• Format: Patent
• Language: English
• Published: 09.09.2015
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; RELAYS; SELECTORS; TRANSPORTING; WORKING METALLIC POWDER

The invention discloses a method for preparing CuCr25 electrical contact by utilizing the vacuum self-consuming arc-melting technology. The method comprises the steps that 1, qualified Cu powder and Cr powder are selected according to composition proportion of CuCr25 electrical contact materials and mixed; 2, cold isostatic pressing is conducted on the evenly mixed powder; 3, sintering is conducted on a self-consuming electrode which is subject to cold isostatic pressing; 4, self-consuming smelting is conducted on the electrode which is subject to sintering. By means of the method for preparing the CuCr25 electrical contact by utilizing the vacuum self-consuming arc-melting technology, the inclusion problem caused by scaling-off of a crucible in the preparation process of the electrical contact materials through the smelting and casting technology is solved, microstructures of the CuCr25 electrical contact materials in the casting state are refined, the gas content in a casting ingot is reduced, and the alloy casting ingot is purified.