Abstract
Nevertheless, asbestos though having ample physical and tribo-mechanical properties is being banned worldwide due to its health hazardousness. Most importantly, any material replacing asbestos should have comparable friction properties. This paper aims at comparative study of frictional characteristics of asbestos base and asbestos free brake pad materials. A total of three friction materials namely AF-22 (metallic based), CL-3003 (fine brass based) and DM-6 (asbestos based) were compressed and moulded into a sample. Experiments were performed using dedicated test set-up based on Pin-on-disc principle. Coefficient of friction was compared for three materials at different conditions of sliding velocity and pressure. Experiments were performed using Taguchi’s L27 orthogonal array. Ranking of the parameters have been done based on experimental results and S/N ratio analysis. The elemental composition of materials was measured by EDS technique. Scanning electron micrographs of brake pad samples were tested at different magnifications. Further investigations to evaluate wear rate, stopping distance under simulative test conditions are suggested.
Highlights
A brake pad plays very important role in automotive braking system to decelerate the vehicle
The energy dispersive spectroscopy (EDS) spectrum represents the elemental analysis of three different materials
Scanning electron microscopy images depicted chunk, segments and block images for both non-asbestos materials, fibrous swirl were observed in asbestos material indicating less effective against tribological properties
Summary
A brake pad plays very important role in automotive braking system to decelerate the vehicle. In order to achieve this brake friction material should maintain a high coefficient of friction, good thermal conductivity and hardly any running wear. Evaluation of mechanical and physical properties of alternate to asbestos friction materials with other commercial brake pad materials and their performance evaluation was discussed [1,2,3,4,5]. Matteo et al investigated on the use of the pin-on-disc test to simulate off-brake friction and wear characteristics of friction materials [11, 14] and reciprocating sliding test set-up [18-19]. Morphological analysis [13] , correlation among temperature variation [16-17] , tribological evaluation of rubber resin bonded brake pad materials [19] were examined for its commercial applicability. Analysis of variance using Taguchi’s technique was carried out in order to find suitability of a material for brake pad application
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