Abstract
A Paper-based friction material has been used in the wet clutch with automatic transmission fluid (ATF) in order to obtain good friction characteristics, however friction behavior of wet clutch is not sufficiently clarify. In this study, paper-based friction materials were rubbed with ATF using a pin-on-disk type tribometer and the contact area between the prism and the paper-based friction materials was observed using the total reflection optical system. Two kinds of paper-based friction materials, poly-para-phenylen terephthalamide (PPTA) fiber-filled friction materials and PPTA + carbon fiber-filled friction materials were used. As a result, it was found that coefficient of friction tend to increase and real contact area tend to be constant as the sliding speed increased. In addition, both coefficient of friction and real contact area tend to increase as the increasing the contact pressure.
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