Patent ID: 7189656
Filing Date: 2007-03-13
Classification: B22F,C22C,H01H

Abstract:
1. A method for manufacturing an internal-oxidation-type Ag-oxide-based electric contact material, characterized in that after an atmosphere in a pressured oxidation furnace is replaced with oxygen, the temperature of an internal-oxidative Ag alloy prepared under a condition of a cold roll rate of 50 to 95% is gradually raised from a temperature of 200° C. or less in a pressured oxygen atmosphere with an oxygen pressure of 5 to 50 kg/cm 2 and internal oxidation processing is performed with an upper limit temperature of 700° C., thereby restraining an Ag-rich layer generated on an outermost surface and an oxide-flocculated layer immediately below the Ag-rich layer and uniformly and finely precipitating and dispersing a composite oxide of added elements to a deep part of an internal structure.