Temperature dependence of friction coefficient and transfer film formation in organic friction materials containing different abrasive components

Abstract

Purpose

This paper aims to investigate the temperature dependence of transfer film formation and friction coefficients in NAO friction materials with four different abrasive components, ZrO₂, ZrSiO₄, Al₂O₃ and Fe₃O₄.

Design/methodology/approach

8.5% SnS₂ was added as a lubricating component to friction materials. Friction tests comprised 100 times of consecutive braking application for each friction material under constant temperature of 300°C, 400°C, 500°C and 600°C. After the friction tests, the friction surfaces of the counterpart disks were examined by scanning electron microscope to access the formation of transfer film.

Findings

Coefficients of friction depended on not only friction temperature but also friction history which is related to development of transfer film. The effect of the transfer film formation was to reduce the friction coefficients for most friction materials. Quantities of the transfer film formation varied with friction materials; at low temperature below 400° the transfer film formation was most active in the Fe₃O₄ materials, while at 600° it was the most active in the Al₂O₃ material. The effect of the lubricating component SnS₂ was to suppress the formation of transfer film, thus enhancing friction coefficients.

Social implications

The enhancement of friction coefficients with addition of small amount of lubricating components such as SnS₂ is expected to open a new approach in developing high performance-brake pads.

Originality/value

Temperature was the controlling parameter in the present test. Under these test modes, transfer film could be fully developed to access the role of the transfer film.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0427/

Citation

Chung, J.O., Go, S.R., Choi, H.B. and Son, T.K. (2020), "Temperature dependence of friction coefficient and transfer film formation in organic friction materials containing different abrasive components", Industrial Lubrication and Tribology, Vol. 72 No. 4, pp. 483-489. https://doi.org/10.1108/ILT-10-2019-0427