フェノール樹脂複合材の摩耗特性に対する金属酸化物の添加効果

概要

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Brake pads are phenolic resin composites which contain many ingredients such as metal fibers, inorganic fillers, organic fillers, and so on. As a basic study for the improvement of brake pad wear, the influence of fine metal oxide powder on pad wear characteristics was investigated, using pad samples with simplified formulation containing different types of metal oxide. These test samples were rubbed against the cast iron using twin-ring tribometer. Wear test results showed the pad wear varied with the type of metal oxides. Low wear was shown with the addition of metal oxides which were hardly reduced. In other words, pad wear was related to the degree of difficulty in reduction of metal oxide. This indicates the reductive atmosphere was formed at friction interface which was brought by the decomposition of the phenolic resin. Therefore, pad wear depended on the difficulty in reduction of metal oxide in the phenolic resin composites.