Purpose

This study aims to investigate the effect of combined use of granular graphite and petroleum coke on the properties of copper-based friction materials and the friction and wear mechanisms.

Design/methodology/approach

Copper-based friction materials with different proportions of petroleum coke and granular graphite were prepared by using powder metallurgy. The friction surfaces were analyzed.

Findings

Changing the ratio of petroleum coke/granular graphite affects the formation of oxides and sulfides on the surface of the materials. Increasing the petroleum coke promotes the production of metal sulfide and sulfate in the friction materials and reduces coefficient of friction (COF) and wear. Increasing petroleum coke also increases the amount of carbonic oxide (CO) released during the braking process and promotes the reduction process of iron oxide on the friction surface.

Originality/value

The synergistic effect of carbon materials on copper-based friction materials was studied in terms of the tribological chemical reaction. This research provides useful information for the selection of carbon materials in friction materials.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0075/

中文翻译：

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碳材料对铜基摩擦材料性能的协同作用

目的

本研究旨在研究颗粒状石墨和石油焦的联合使用对铜基摩擦材料的性能以及摩擦磨损机理的影响。

设计/方法/方法

采用粉末冶金法制备了不同比例的石油焦和粒状石墨铜基摩擦材料。分析了摩擦表面。

发现

改变石油焦/粒状石墨的比例会影响材料表面氧化物和硫化物的形成。增加石油焦炭可促进摩擦材料中金属硫化物和硫酸盐的产生，并降低摩擦系数（COF）和磨损。增加石油焦炭还会增加制动过程中释放的碳氧化物（CO）的量，并促进摩擦表面上氧化铁的还原过程。

创意/价值

从摩擦学化学反应的角度研究了碳材料对铜基摩擦材料的协同作用。这项研究为选择摩擦材料中的碳材料提供了有用的信息。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-02-2020-0075/