To produce a sintered silver-iron material for electrical contact, having slight joining tendency, contact resistance, etc., by specifying the carbon content and microhardness of iron grains in a sintered silver-iron material containing specific amounts of iron and additives such as metallic additives.
A mixture is prepared by mixing 0.5-20wt.% of iron powder and 0-5wt.% of other metallic additives, oxide additives, nitride additives, and/or carbide additives are mixed with a silver powder. This mixture is subjected to cold isostatic pressing, sintered at about 650-940°C, and extruded, by which the sintered silver-iron material is produced. At this time, the iron grains in the sintered material has a carbon content exceeding 0.25wt.% and a microhardness exceeding 200HV0.025. Moreover, zinc, copper, manganese, etc., are used as metallic additives, and aluminum oxide, silicon oxide, etc., are used as nonmetallic additives. By this method, the sintered silver-iron material for electrical contact, having high combustion resistance and long service life, can be obtained.
BUIRI MARIKOFUSUKII
ROJIE BUORUMAA
PEETAA BURAUMAN
ANDOREASU KOFURAA
