Abstract
Graphite is commonly used in brake pads. The use of graphite powder has the main goal of solid state lubrication and friction coefficient stabilization. In this article results on resin bonded brake pads with focus on noise performance and heat dissipation are presented. Experimental tests are based on model friction materials with a known formulation and a reduced number of components for a better identification of the role of the graphite type. Results clearly indicate that both noise performance and thermal conductivity are strongly affected by the type of graphite. Guidelines for the selection of graphite types for optimized friction materials are given.
Highlights
A major focus of research in the automotive industry is passenger’s comfort during braking
Experimental tests are based on model friction materials with a known formulation and a reduced number of components for a better identification of the role of the graphite type
C-THERMTM011 has been tested only in combination with T150-600 (Formulation 6) since this special graphite is meant as minor additive to boost the thermal conductivity of brake pads and not as substitute for conventional graphite that has to guarantee the lubrication and stabilization of the friction coefficient
Summary
A major focus of research in the automotive industry is passenger’s comfort during braking. While the coupling of vibrational modes leading to squeal are well understood and identified, the conditions that cause squeal occurrences remain poorly understood This is mainly due to the complexity of the physical phenomena underlying the contact between the surfaces and the many factors that influence local friction. In order to improve brake NVH (Noise, Vibration and Harshness) performance, it is essential to understand which elements cause the squealing. Another focus of research in brake pads is generated by the new environmental regulations in the USA, aiming to reduce the amount of copper in brake pads initially to less that 5% and eventually to less than 0.5%. The effect of graphite type, texture and particle size distribution on the thermal conductivity of the brake pad and on brake squeal occurrence have been investigated
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