SINTERED FRICTION MATERIAL

PROBLEM TO BE SOLVED: To provide a sintered friction material favorable in aspects of environmental protection because of no designated chemical substance by the PRTR (Pollutant Release and Transfer Register) law contained at all and capable of avoiding production of friction of the same kind in a high-temperature region, preventing deterioration of friction coefficient, raising lubricity and preventing the occurrence of a large amount of sparks. SOLUTION: The sintered friction material is prepared by regulating the total metal content of an iron-based component containing reduced iron or cast iron and a graphitization promoting element (aluminum, silicon or titanium) to 18-26 vol.% and the content of graphite having high lubricating effects to 45-65 vol.%. As a result, since the content of the metal causing friction of the same kind is smaller than that in the conventional metallic sintered friction material, the deterioration of the friction coefficient caused by the friction of the same kind can be prevented. The graphite is contained in a larger amount than that in the conventional metallic sintered friction material and the occurrence of the large amount of sparks can be prevented by raising the lubricating effects. COPYRIGHT: (C)2009,JPO&INPIT