PRODUCTION OF CARBON MATERIAL FOR SLIDING CURRENT COLLECTION

摘要

PURPOSE:To obtain a highly strong carbon series sliding current collecting material having low electric resistant and high resistance to brittle fracture by a method wherein a carbonaceous powder material is added with specific quantity of metallic fibers and admixed and then it is molded or subjected to hydrostatic press and sintered followed by impregnation with a metal having melting point lower than that of the admixed metallic fibers. CONSTITUTION:Metallic fibers are admixed by 5vol.%-60vol.%, preferably, 10-45vol.%, for the total of carbonaceous powder material and the metallic fibers. When it is lower than 5vol.% electric resistance does not decrease sufficiently whereas when it is higher than 60vol.% the carbonaceous material is not sintered sufficiently thus causing drop of strength. Thus obtained mixture material is then molded or subjected to hydrostatic press and sintered at a temperature lower than the melting point of the metallic fiber under environment of inert gas such as argon or nitrogen thus carbonizing the mixture material. It is then subjected to metal impregnation. The impregnating metal must have melting point lower than that of the admixed metallic fiber.