CONTACT MATERIAL FOR VACUUM VALVE AND MANUFACTURING METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide contact material for a vacuum valve used in a vacuum breaker and the like improving an breaker performance and a manufacturing method of the same. SOLUTION: Contact material is manufactured by pressure-forming mixed powder of Cu powder or the like as a conductive element and Cr powder or the like as an arc resistant element. A surface obtained corresponding to an breaker surface of the contact material and the adjacent part are melted by for example irradiation of laser beam (1 mm or more depth from the surface), and then are rapidly solidified to fine structure of the material. An average particle size of the arc resistant element is maintained as 50μm or less then the surface is pressed or machined to be smoothed to surface roughness of 10μm or less and processed in a contact shape.