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Recent attention to the improvement of line-haul truck brake effectiveness, to compensate for lowered aerodynamic drag and to increase road safety, has prompted the US Department of Energy to support several projects aimed at the development of lightweight, high-performance friction materials. Using a specially designed, sub-scale disc brake testing system, a series of experiments was conducted to...
The present paper deals with the wear data analysis of friction composites where, the nature and the concentration of the abrasives were varied systematically in steps of 2%. The abrasives selected were; SiC, SiO 2 , ZrO 2 and Al 2 O 3 in the concentration range of 2-6%. The wear studies on the composites were carried out on a pad-on-disc type tribo-tester. The wear...
Increasing requirements for friction systems such as smaller dimensions and greater power transmission lead to enhanced power density in dry frictional contact. Present organic based materials will be overloaded due to severe conditions and new friction materials are needed maybe on the basis of advanced ceramics.In the present study, ceramic composites were produced by embedding TiN particles into...
Frictional stability and wear resistance are key performance requirements for heavy truck brake linings. Lining-counterface friction affects the rate of vehicle deceleration, but wear also affects stopping characteristics because uneven or high wear can alter the contact geometry of the lining, change the pattern of frictional heat generation, and degrade the response of the braking system. Inertia...
The effect of three different solid lubricants (graphite, Sb 2 S 3 , and MoS 2 ) in the brake friction material on various aspects of friction characteristics was investigated. Three friction material specimens were produced based on an experimental formulation, and they contained 10vol.% graphite, 7vol.% graphite+3vol.% Sb 2 S 3 , and 7vol.% graphite+3vol.%...
Styrene butadiene nano powdered rubber and nitrile-butadiene nano powdered rubber were used for manufacturing clutch facings, disc brake pads and brake linings to replace conventional styrene butadiene rubber and nitrile-butadiene rubber. The results of constant speed friction test and dynamometer test showed that nano powdered rubber can substantially improve properties of friction materials. The...
As is the case for tribological systems in general, the wear of brake friction materials, sliding against brake discs or drums, is influenced by many factors. This dependency requires very complicated test matrices in order to characterize the range of lining wear properties. Furthermore, the wear rate is very low under normal operating conditions, and thus a substantial amount of test time is needed...
Phenolics or their modified versions are invariably used as binder materials for friction composites. However, poor shelf life, evolution of harmful volatiles during processing, need of inclusion of curing agent before dispatching to the market, shrinkage in final products along with voids, etc. are the major problems associated with phenolics. In order to overcome these, an alternative resin was...
The research presented in this paper is focused on the effect of silicon carbide (SiC) on friction–wear properties of semi-metallic friction composites (FC). Semi-metallic FC with increasing content of silicon carbide (SiC: 0, 3.4, 5.6, 9 and 14.6vol.%) were prepared and slid against cast iron disc and their friction–wear properties were evaluated. The friction coefficient (μ) was observed to increase...
Wear of the brake friction materials with straight phenolic resin, silicon modified phenolic resin, or boron–phosphorous (B–P) modified phenolic resin was investigated. A simple formulation was used to produce friction material specimens and wear tests were carried out using a Krauss type friction tester. Friction stability and wear rate of the three friction materials were compared as a function...
This study examined brake friction materials containing multi-wall carbon nanotubes (CNTs) to determine their effect on the braking performance. The friction materials were produced using conventional dry mixing methods by substituting barite with CNTs (1.7, 4.7, and 8.5wt.%). Their tribological properties were examined using both a Krauss type tester and a 1/5 scale brake dynamometer. The physical...
WC-CoCr coatings on cast iron discs were prepared with different surface roughness and submitted to dry sliding wear tests against a commercial friction material using a pin-on-disc configuration. The effect of roughness on the friction and wear of the tribological system was evaluated. The pin wear rate increases with the coating roughness and becomes very high for an arithmetic average roughness,...
The present era is dominated by nano-materials. Researchers are keen to explore the potential of nano-particles (NPs) in composites because of their intensive interaction with the matrix and surfaces due to very large surface area.Potassium titanate (KT) is used as a filler in a good quality non-asbestos organic (NAO) friction materials (FMs). Based on a little information available in the literature,...
Relevance of wear occurring in brakes increased with relation to the released chemicals and health and environmental hazards. Wear of brakes leads to formation of complex chemicals that are released into environment. Humidity can considerably modify the adhesion of surfaces by creating menisci and increasing the contact area. This paper addresses the impact of humidity on two commercial brake material...
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