Title:
MANUFACTURE OF CONTACT POINT MATERIAL
Document Type and Number:
Japanese Patent JPS5471707
Kind Code:
A
Abstract:
PURPOSE: To provide excellent composite contact material through internal oxidation method, by treatment of an alloy contg. principally Ag-Bi under specific conditions.
CONSTITUTION: Molten metal of an alloy contg. principally Ag-Bi is cast to ingot, which is pulverized to small scaly pieces, then it is compressed in a metallic die to give a molded item of voidage 5W10%. The item is pressure-molded at a temp. not lower then 700°C and lower than 825°C in oxidizing atmosphere to a voidage not higher than 2%. The item is further heated and sintered, and is subjected to extrusion and drawing repeatedly in order to increase the strength and density of the material, thus producing contact material.
Inventors:
SHINTA SANKICHI
OOKUMA SHINJI
HIROHATA HIYOUGO
OOKUMA SHINJI
HIROHATA HIYOUGO
Application Number:
JP13928177A
Publication Date:
June 08, 1979
Filing Date:
November 18, 1977
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
B22F3/16; B22F3/12; C22C1/05; C22C5/06; H01H1/02; H01H11/04; (IPC1-7): B22F3/12; C22C1/05; H01H1/02