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Fabrication and characterization of Aluminum-Granite-Graphite Metal Matrix Composite
Abstract
Moving machine elements are constantly subjected to wear and tear. Machine life can be improved by using hard and wear resistant materials. Most of machine elements are made of metals or alloys. These materials alone cannot meet the requirements of design of long-life machines. Naturally occurring hard materials lack the strength to withstand the machine loads. Composite materials provide the solution to such requirements. Based on requirement, a composite material of desired quality like strength, hardness, toughness, or heat-resistance can be manufactured. Aluminum is one of most used matrix components in Metal Matrix Composites (MMC) for manufacturing wear resistant materials. Aluminum MMC applications include automotive components like pistons, cylinder liners and braking components due to high wear resistance.
Granite is a widely available material. It has abrasion resistance and is chemically inert. Using Stir casting method, granite particulates along with graphite particulates are incorporated as dispersed phase into an aluminum A356 alloy matrix. Graphite is included to improve thermal resistance and provide lubrication. Two samples, one sample with 2.5% by weight of each particulate matter and another with 5%by weight are fabricated and tested. The fabricated composite exhibited significant rise in wear resistance with decreased density as the percentage of dispersed phase increased.
Keywords: Density properties, granite and graphite, MMC of A356, Stir casting harness; wear
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DOI: https://doi.org/10.37628/jcmm.v6i2.694