Abstract
In this study, asbestos-free brake lining was developed with sawdust. Sawdust was considered an alternative to asbestos, whose dust is carcinogenic. The sawdust from hard wood (mahogany and iroko trees) and other components such as abrasive, reinforcer, lubricant, were sieved into grade of 100 µm and used in production of brake linings. The percentages of sawdust for the samples are 40, 45, 50, 55, and 60. The percentages of abrasives (silicon carbides) were 27, 22, 17, 12 and 7, while binder (resins) lubricant (steel dust) and carbon black (reinforcer) were constant at 13%, 15% and 5% respectively on each sample. The molding pressure load was varied at 10 Mg, 20 Mg, 40 Mg, 60 Mg and 80 Mg during compression process. The brake lining properties examined are hardness, compressive strength and density. Also, the effects of molding pressure on these properties were evaluated. The results obtained show that the higher the molding pressure, the better the physical and mechanical properties. Furthermore, at high molding pressure, the properties reached a limiting point which they tend to be constant. The brake linings based on sawdust were then compared with commercial (asbestos-based) brake lining and the results are in close agreement. Hence, sawdust can be effectively used as filler for replacement of asbestos in brake linings.
Highlights
Brake pads are one of the most important safety and performance components in automobiles
Loss On Ignition (LOI) of sawdust is very high, this explain why steel dust and silicon carbide were used in certain proportion to control the thermal deficiency in the filler material
Based on the mechanical properties, wear properties, morphology and the effect of molding pressure on the brake pad lining produced using saw dust composite as filler, the following conclusions are derived from the study:
Summary
Brake pads are one of the most important safety and performance components in automobiles. The major component in the brake is the lining materials, which are made up binder, reinforced fibers or structural materials, filler and frictional additives and modifiers [1]. The binder holds the ingredients together, to maintain structural integrity of the brake lining, while filler make up the free volume of the brake lining while friction modifiers stabilize the coefficient of friction and wear. These components perform synergistically in controlling friction and wear performances of the brake pad. Fillers are used to maintain the overall composition of the friction material, as well as to improve physical, mechanical and tribological properties of brake pad [2]. To some extent, fillers affect the final properties of brake performance, especially in terms of resistance to heat, abrasion, and strength
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