Simultaneous effect of flake powder methodology and SiC addition on the density and hardness of Al matrix

Abstract

In the present work, Flake Powder Methodology(FPM) followed by cold press sintering has been adopted to improve the density and hardness of the Aluminium based metal matrix composite. The effect of hard ceramic particles of SiC (1 vol%) on the Al matrix has been also studied. Three powders Al (procured), Al (FPM), and Al_SiC_1 vol% (FPM) were taken. Green samples using three respective powders were then compacted at 867 MPa and sintered in an inert atmosphere at a temperature of 530 °C for 2 Hr. The particle size of Al was observed to be reduced by adopting FPM. Al sample prepared following FPM shows an improvement of 14.83% and 157.2% in density and hardness respectively compared to the Al sample prepared from procured powder. However, SiC addition by 1 vol% decreased the relative density by 2.12% and improved the hardness by 30.63% compared Al(FPM) sample. Tribological tests has been performed in a ball on disc reciprocating microtribometer at 10 N load with a 6 mm chrome steel ball with the sliding speed of 0.5 cm/s and 5 cm/s. Addition of SiC into Al matrix increased COF of the composite and lowered the wear rate. The COF and wear rate were also increased with increases in sliding speed.