CONTACT MATERIAL FOR VACUUM VALVE, METHOD OF PRODUCING THE SAME, AND VACUUM VALVE

摘要

PROBLEM TO BE SOLVED: To provide a contact material for a vacuum valve, excellent in withstand voltage performance.SOLUTION: A method of producing a contact material for a vacuum valve includes the steps of: molding and sintering powder mainly consisting of Cr powder to obtain a porous compact; and infiltrating the porous compact with Cu in a mixed gas atmosphere, the mixed gas containing hydrocarbon gas and reducing gas and having a content of the hydrocarbon gas of 5 vol.% or more and 25 vol.% or less. Alternatively, a method of producing a contact material for a vacuum valve includes the steps of: molding and sintering powder mainly consisting of Cr powder to obtain a porous compact; and infiltrating the porous compact with Cu and then holding the Cu-infiltrated porous compact in a mixed gas atmosphere, the mixed gas containing hydrocarbon gas and reducing gas and having a content of the hydrocarbon gas of 5 vol.% or more and 25 vol.% or less.