Fabrication Method of Cu-Cr Contact Materials for Vacuum Switches

摘要

PURPOSE: A copper-chromium contact material for a vacuum switch and a manufacturing method thereof are provided to manufacture a wholesome Cu-Cr contact material by including a uniform and dispersed sintering structure of Cr particle in Cu matrix. CONSTITUTION: A mixing powder of a copper(Cu) powder and a chromium(Cr) powder is put and pressurized in a mold to manufacture a molding material. A content of the chromium(Cr) ranges 25-75 weight %. The molding material is sintered to a solid status at a temperature lower than a melting point of the copper to obtain a solid-phase sintered body. The temperature lower than a melting point of the copper ranges 900-1075°C. The solid-phase sintered body is heated to a temperature higher than the melting point of the copper to perform a liquid-phase sintering operation. The temperature higher than a melting point of the copper ranges 1100-1250°C.