フェノール樹脂の摩擦分解によるブレーキパッド中の金属酸化物の摩擦還元

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Brake pads are phenolic resin composites which contain several ingredients such as metal fibers, inorganic fillers, organic fillers, and so on. As previously reported, wear tests showed that pad wear varied with the type of metal oxide. Low wear was observed with the addition of metal oxides which were hardly reduced. This behavior was attributed to the frictional mechanism accompanying the tribo-degradation of phenolic resin which reduces the metal oxides at friction surface. The reduction of metal oxide associated with friction was defined as tribo-reduction. In this paper, two experiments were performed to demonstrate tribo-reduction in the friction of phenolic resin composite materials. In the first set of experiments, wear tests were conducted between cast iron or copper as disk material and pad materials to which different types of metal oxides were added. Results showed an increase in wear amount when the disk metal and the metal of the metal oxide added to the pad material were the same. This means that the reduction of metal oxide changed the friction system into similar metal contact. In the second set of experiments, samples composed of the same amount of metal oxides and phenolic resin were heated to test the chemical reactions between them. X-ray diffraction analyses showed that the metal oxides were reduced. From these results, it is clear that tribo-reduction takes place during friction of phenolic resin composite materials because of the degradation of phenolic resin.

フェノール樹脂の摩擦分解によるブレーキパッド中の金属酸化物の摩擦還元

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