Development and investigation of properties of aluminium silicon alloy fly ash composites produced by powder metallurgy

Abstract

Metal matrix composites are commonly used today in many aerospace and industrial applications MMCs possess significantly improved properties including high specific strength specific modulus damping capacity and good wear resistance compared to unreinforced alloys Most of the research has been carried out to produce metal matrix composites based on the conventional particulate reinforcement such as Al2O3 SiC TiC newlineand B4 C particles There has been increased interest in composites containing low density and low cost reinforcements Among various discontinuous dispersoids used fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by product duringcombustion of coal in thermal power plants The high electrical resistivity low thermal conductivity and low density of fly ash may be helpful for making a light weight insulating composites The utilisation of fly ash reduces newlinethe production of aluminium This reduces the generation of green house gases as they are produced during the bauxite processing and alumina reduction newline