Abstract
In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction composites was evaluated using a constant speed friction tester. The results showed that the expanded graphite composite (EGC) displayed better lubricity in both the fading and the recovery processes. The wear rate of the EGC decreased by 22.43% more than that of the natural graphite composite (NGC). In the fading process, and the EGC enhanced the stability of the coefficient of friction. The recovery maintenance rate of the NGC was 4.66% higher than that of the EGC. It can be concluded that expanded graphite plays an important role in the formation of a stable contact plateau and can effectively reduce the wear.
Highlights
Non-asbestos organic (NAO) friction materials, such as multi-ingredient polymer matrix composites with complex formulations, are used extensively in the transportation and mechanical industries
The wear rate of expanded graphite composite (EGC) decreased by 22.43% compared to that of natural graphite composite (NGC)
(1) EGC proved excellent in the composite NGC in terms of lubrication properties and wear resistant performance
Summary
Non-asbestos organic (NAO) friction materials, such as multi-ingredient polymer matrix composites with complex formulations, are used extensively in the transportation and mechanical industries. Solid lubricants play an important role in reducing the wear rate [3, 4] and in facilitating smooth-sliding and a stable coefficient of friction under a wide range of pressures, speeds, and environmental conditions [5]. Due to their high thermal conductivity, layered structure, capacity for dispersing friction-generated heat, and relatively stable coefficients of friction, natural graphite (NG) and synthetic graphite are often used as solid lubricants in friction materials [6,7,8]. Other types of graphite have been studied, but are not the focus of this particular paper [11]
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