Magnesium Addition and Treatment of Reinforcement Particles in Al6061 – Sea Sand Composite on Coefficients Friction and Wear Rate

Hammar Ilham Akbar, Muhammad Ilham Arbi Atmaja, Eko Surojo, Bambang Kusharjananta, Reza Aldiansyah Fanani

Abstract

Aluminium Matrix Composite (AMC) is a composite material with an Al matrix and ceramic reinforcement particles such as SiC, Al2O3, B4C, TiB2, ZrO2, SiO2, graphite, and even sea sand can be used as reinforcement. The process of making the Al6061-Sea sand composite uses the stir casting method with a stirring time of 10 minutes and a speed of 600rpm. Stir casting specimens are manufactured with a height dimension of 20 mm and a diameter of 10 mm. After that, the specimen was friction tested using the pin on disc method. The highest coefficient of friction is the specimen without electroless coating with the addition of 2% wt Mg of 0.634. The more mass fraction of sea sand, the higher the porosity, and the lower the density. To increase the friction coefficient and reduce porosity, an electroless coating process can be carried out on the reinforcing particles. This study aims to determine the effect of the addition of Mg and treatment of reinforcing particles on the Al6061-Sea sand composite on the coefficient of friction and wear rate. The coefficient of friction, the density of the specimen increases, the porosity and the wear rate decrease, this occurs because the reinforcement particle size of sea sand binds more strongly to the aluminium matrix. The highest coefficient of friction is the electroless coating with the addition of 2% wt Mg of sea sand, which is 0.646.

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DOI: https://doi.org/10.20961/mekanika.v23i1.78335

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