Abstract The present work aims to investigate the sliding friction and wear behavior and related emissions of airborne particulate matter of Cu-free barite containing friction materials for vehicular brake pads. In particular, the effect of different concentrations of phenolic resin used as a binder has been considered. Tribological tests were conducted using a pin-on-disc laboratory tester. During running-in, the friction coefficient and the emission rate of airborne particles follow the same trend and both are influenced by the content of phenolic resin. The friction material with an intermediate content of phenolic resin, up to 6.5 wt%, showed the best behavior. This was explained considering that the phenolic resin increases the mechanical integrity of the composite friction materials but also increases its compliance, thus increasing the area of contact during sliding and the extension of the relevant secondary plateaus.

中文翻译：

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不同酚醛树脂含量的无铜摩擦材料的滑动行为和颗粒排放

摘要 本工作旨在研究含无铜重晶石汽车刹车片摩擦材料的滑动摩擦磨损行为及空气中颗粒物的相关排放。特别地，已经考虑了用作粘合剂的不同浓度的酚醛树脂的影响。使用针盘式实验室测试仪进行摩擦学测试。磨合过程中，摩擦系数和空气中颗粒物的排放率呈相同趋势，均受酚醛树脂含量的影响。具有中等含量酚醛树脂（高达 6.5 wt%）的摩擦材料表现出最佳性能。这是考虑到酚醛树脂增加了复合摩擦材料的机械完整性，但也增加了其柔顺性，