| 摘要 |
For reduction in size and weight, friction materials aiming at a high coefficient of kinetic friction have been developed. However, friction materials with a high coefficient of kinetic friction may cause sticking to a sliding partner material and deteriorated feeling in operation in particular in the initial running-in period during the initial stage of use. Therefore, the use of friction materials with a high coefficient of kinetic friction has been restricted. Since such sticking to the sliding partner material is less likely to occur after experiencing an initial running-in period, developed was a friction material in a form that is effective in prevention of sticking during the initial running-in period. Among sliding surfaces 5 between the friction material 3 and the sliding partner material 7, only the initial sliding surface 5', or only the initial sliding surface 5' and the vicinity thereof are in contact during the initial running-in period, and the area in contact with the sliding partner material gradually increases over time to full-area contact, that is, full contact of the whole sliding surfaces 5. The above constitution provides a sliding friction material having excellent sticking resistance with excellent friction performance and abrasion resistance.
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