SINTERED FRICTION MATERIAL

PROBLEM TO BE SOLVED: To provide a sintered friction material suitable for environmental protection because it does not include chemical substances designated in the PRTR Law at all and excellent in a friction coefficient, strength, wear resistance and performance during braking such as low aggressiveness to a mating member. SOLUTION: This sintered friction material is constituted by using powder formed of cast iron as a base material, and obtained by sintering compound powder comprising 30 to 65 vol.% of cast iron, 5 to 20 vol.% of aluminum, 5 to 10 vol.% of a grinding component with 6 or lower Mohs hardness and 25 to 40 vol.% of graphite. Due to compounding of the aluminum powder, a thin aluminum layer is formed on the surface of the sintered friction material all the time, and friction of the same kind between iron in the friction material and iron in the mating member is avoided. As a grinding material, a relatively soft material of 6 or lower Mohs hardness such as magnesia is compounded. Since a larger amount of graphite is included as a lubricating material compared to conventional cases, the aggressiveness to the mating member is further declined. COPYRIGHT: (C)2007,JPO&INPIT