This paper investigates the microstructure and mechanical properties of aluminum alloy (Al-Si-Fe) reinforced with coconut shell-ash particulate. The aluminium (Al-Si-Fe) alloy composite was produced by a double-stir casting process at a speed of 700 rpm for 10 and 5 minutes at first and second stirring respectively. The samples produced from addition of 0-15 wt% coconut shellash particles (CSAp) were prepared and subjected to microstructural and mechanical properties testing. The results of the microstructural analysis of the composite reveal a fairly uniform distribution of the coconut shell-ash particles in the matrix with increase in volume fraction of CSAp. The mechanical property test results revealed that, hardness of the developed composite increased with increasing percentage weight of CSAp. Also the tensile and yield strength at 0.2% offset values of Al-Si-Fe/CSAp composite increased with percentage increase in CSAp up to 9% addition above which a little decrease in both tensile and yield strength was observed.Keywords: Matrix, coconut shell, mechanical properties, stir- casting, particulate, reinforcements
Automotive brake friction materials are an important part in brake and clutch devices. Friction materials used for brake pad/linings are obtainable from the simple formulation containing some elements to complex composites with as much as 20 or more elements. This research presents the use of an organic-based (mainly agro-based) formulation as base materials for the production of automobile brake pad/lining and for other industrial applications with a view to replacing the use of asbestos whose dust is carcinogenic. The research involves the preparation of experimental materials by addition in percentage weight of graphite, coconut shell powder, zinc barite, carbon black resin, oxide, friction dust, and brass powder as 2. 1,2.5,1.3,1.4,0.2,0.7, 0.5, and 0.6 wt. % respectively in that order. Test samples were produced by steel molding method and machined to the standard size for the purpose of determining quality bonding, hardness value and swell-growth. The result obtained show a standard homogenous bonded experimental brake pad/lining having a Brinell hardness value (BHN) of about 32.3 and swell growth of 0.625%.
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