MANUFACTURING METHOD OF CONTACT MATERIAL FOR VACUUM VALVE

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a contact material for a vacuum valve excellent in a breaking property and withstand voltage characteristics. SOLUTION: The manufacturing method of a contact material for a vacuum valve comprises a first process of mixing Cu powder with an average particle size of 20 to 200μm, Cr powder with an average particle size of 40 to 200μm, and powder of auxiliary components like W having a melting point higher than that of Cu and an average particle size of 0.3 to 10μm within a range of 0.1 to 2 vol% against the total volume of the powder; a second process of forming a fused body by fusing the Cu powder and a whole or a part of Cr powder in the mixed powder in a heat resistant container by raising the temperature of the mixed powder obtained by the first process to that of not lower than the melting point of Cu and not higher than that of the auxiliary components, and cooling the fused body in the heat resistant container or by filling the fused body in a mold; and a third process of forming a plurality of contact materials by processing the fused body cooled at the second process. COPYRIGHT: (C)2006,JPO&NCIPI