Abstract
Friction brake material is important component in the braking system of the vehicles. These materials are usually made of asbestos and non-asbestos materials. Some non-asbestos materials use natural fibers as reinforcement and phenolic resin as a binder. The post-curing process is carried out by heating a material with specific temperature and time. During post curing, ammonia gas as the reaction of the phenolic resin and HMTA diffuses out from the friction brake material. The heating rate in post curing was supposed affecting process of removal ammonia gas from composite and it will affect mechanical properties of the composite. Therefore, this paper is concerned with effect of post curing method on the composite flexural strength. Composite specimen were manufactured by mixing the ingredients, preforming, hot molding and followed by post curing. Bending tests performed to determine the effect of post curing the flexural strength. The results showed that heating rate in post curing affected flexural strength of composite. Flexural strength of composite decreased with increasing heating rate. Internal defect that were formed during post curing decreased composite flexural strength.
Highlights
The friction brake is important components in the braking system for all kinds of vehicles [1]
The post curing tended to lower the flexural strength of the specimen if the heating rate was set too fast
The decrease in the flexural strength was caused by the internal defect in the specimen
Summary
The friction brake is important components in the braking system for all kinds of vehicles [1]. The friction brake should have the coefficient of friction as required, high wear resistance, and high stability in coefficient of friction [3] To fulfill of these characteristics can not be obtained using one type of material and is only possible by combining multiple materials [4]. The material is often used in the industry because of its resistance at high temperatures and its good performance [7] Those characteristics were produce by crosslinking network structure in the form of three-dimensional arising from the post-curing process of the resin novolac with hexamethylenetetramine (HMTA). In addition to eliminate the ammonia gas, post curing increases the density of cross-links in the network phenolic resin [10]. This work focused to investigate effect of post curing method on composite flexural strength. Particular attention was directed to changes in flexural strength with respect to variation of heating rate and duration
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