SINTERED FRICTIONAL MATERIAL

PROBLEM TO BE SOLVED: To provide an iron-based sintered frictional material in which the use amount of chemical substances designated by a PRTR (Pollutant Release and Transfer Register) law is minimized, improvement in the face of environmental protection is attained, and further, friction properties upon high temperature braking are improved. SOLUTION: The sintered frictional material uses a metallic material as a matrix, and comprises abrasives and a lubricant. The metallic material as the matrix includes 25 to 50 vol% cast iron essentially consisting of an iron based material, 1 to 7 vol% copper, further, ceramics as the abrasives or the like and graphite as the lubricant. Copper is a chemical substance designated by a PRTR law, but has a melting point higher than that of aluminum and has excellent high temperature friction properties, and, by remarkably reducing its content to about ≤1/5 (7 vol%) compared with that in the conventional material, consideration is payed even on environmental protection. By the addition of copper, friction between iron in the frictional material and iron in the mating material of the iron based material can be prevented, and an abrasion loss between the frictional material and the mating material is reduced, and a high temperature friction coefficient can be secured as well. COPYRIGHT: (C)2007,JPO&INPIT