Abstract
A promising friction material, Iron -based friction material, was prepared by powder metallurgy (PM) processing utilizing hot powder preform forging (near net-shape).The preparation of the product and its characterization are presented in this paper. These products are useful in heavy duty Military Aircraft applications such as AN-32. In order to eliminate costly environmental control systems to protect products during their high temperature processing (as is conventionally practiced employing hydrogen gas), the present investigation relies on carbon (mixed in the brake pad formulation) as reducing agent and high temperature oxidation resistant glassy coating (separately developed) applied over the product’s surface after cold compacting. After conducting an initial characterization such as hardness, density and Pin-on Disc tests, the samples were tested in sub-scale dynamometer under Rejected Take Off conditions. It was observed that the obtained density in the present investigation is higher than the reported density obtained by sintering route, and wear is on the lower side of the range as per the Aeronautical Standards. Optical metallography was used to investigate the microstructure of friction, interface and backing layer. It was observed that the distribution of ingredients in matrix was homogeneous. The results also indicate that the coefficient of friction is more stable, and wear is lower with respect to temperature rise. .
Highlights
Friction materials which are made by powder metallurgical technique, have been widely used in commercial/fighter aircrafts; high speed trains; brakes; clutches and gear assemblies of different kinds of automobiles [1].Mohammad Asif, K
Development of Iron Based Brake Friction Material sintering has been replaced by hot powder preform forging with built in powder based backing plate, which is purely solid state processing
It may be noted that the wear in case of GCI (Grey cast iron) is excessively high in comparison to friction materials developed in present investigation
Summary
Friction materials which are made by powder metallurgical technique, have been widely used in commercial/fighter aircrafts; high speed trains; brakes; clutches and gear assemblies of different kinds of automobiles [1]. Development of Iron Based Brake Friction Material sintering has been replaced by hot powder preform forging with built in powder based backing plate, which is purely solid state processing Solid lubricants such as graphite, sulphates and sulphides give rise to improved frictional stability [9] and damping of vibration during engagement, apart from anti-seizure characteristics at higher temperatures [10]. Due to these reasons, iron as base metal matrix have been chosen in the present investigation
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