低树脂基NAO型盘式刹车片摩擦材料的制备及摩擦学性能

Preparation and Tribological Properties of Low Resin-based NAO Disc BrakePads Friction Material

采用热压成型工艺法制备了一种新型低树脂基NAO(Non asbestos organic)型盘式刹车片,利用洛氏硬度仪(HRS)、定速摩擦试验机、台架试验机和扫描电子显微镜(SEM)等对样品进行表征,研究该摩擦材料的摩擦磨损性能。定速摩擦试验结果表明,该摩擦材料的衰退和恢复摩擦系数均保持在0.40左右,衰退率为-5.13%,恢复率为110.25%,抗热衰退性和恢复性能良好,磨损率较低,综合摩擦学性能优异。SEM观察发现,摩擦材料在制动摩擦过程中是由黏着磨损、切削磨损和磨粒磨损等机制共同作用的结果。台架试验进一步表明,该摩擦材料正常摩擦特征值μnom为0.404,其在不同工况条件下速度敏感性、温度和压力敏感性以及抗衰退性能良好,制动性能优异,是一种理想刹车片摩擦材料。

This paper introduces a new type of NAO disc friction material with low resin content by hot pressing process.The samples were characterized by Rockwell hardness tester(HRS),constant speed friction tester,dynamometer test machine and scanning electron microscope(SEM)for the purpose of studying the friction and wear properties of the friction material.The constant-speed friction test results show that the fade and recovery friction coefficient of the friction material is maintained at about 0.40.The fade rate is-5.13%and the recovery rate is 110.25%.The material has an excellent performance in the fade resistance and recovery property aspects,and has a lower wear rate.It is exceptional in tribological performance.The SEM observation found that the friction material was the result of the combined action of adhesion wear,cutting wear and abrasive wear during the braking friction process.The dynamometer test further showed that the normal friction characteristic value(μnom)of this material was 0.404.It has good speed sensitivity,temperature and pressure sensitivity,good anti-decay performance and excellent braking performance under different working conditions.It is an ideal brake pads friction material.