| 摘要 |
PROBLEM TO BE SOLVED: To provide a sintering friction material which is preferable in the face of environmental protection since it comprises no chemical substances designated by a PRTR (Pollution Release and Transfer Register) law at all, and further, by retaining the matrix structure thereof to ferrite, has excellent high temperature properties and corrosion resistance, and also, has performance upon braking, e.g., of reducing the wear amount of the mating material. SOLUTION: The sintering friction material is, as a base, composed of powder formed from a reduced iron having a high melting point instead of the conventional friction material essentially consisting of copper powder. The material is obtained by adding an element(s) having a high graphitization tendency to the reduced iron powder, and sintering the same, and the matrix structure is retained to ferrite. By adding the element(s) having a high tendency of increasing the ratio at which carbon in iron is made to independently exist as graphite (i.e., a graphitization tendency) upon the sintering, the matrix structure is held to ferrite, and the sintering friction material having excellent high temperature properties and corrosion resistance can be obtained. Further, it is possible that its attackability against the mating material such as a brake disk is reduced, and the wear amount of the mating material can be reduced. COPYRIGHT: (C)2008,JPO&INPIT
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