Application of hybrid composites based on ZA27 alloy in automotive industry

Abstract

The field of application of ZA27 alloy is very wide due to favourable combination of physical, mechanical and tribological properties. In automotive industry, it is used for the production of engine cylinders and pistons, engine blocks, plain bearings, pumps, brakes, etc. Composites based on ZA27 alloy were developed with the aim of obtaining materials with better mechanical and tribological characteristics compared to the original matrix alloy. In this paper, special attention is given to metal matrix composites developed from ZA27 alloy with a high content of aluminium. Based on experimental research, the paper presents the tribological characteristics of hybrid composites based of ZA27 alloy and reinforced with silicon carbide and graphite particles. Experimental tribological tests were performed on a tribometer under different test conditions, by varying normal loads and sliding speeds. The obtained composites retain good mechanical properties at elevated temperatures and have better tribological properties compared to the base alloy. Application of the tested composites in the automotive industry is justified by their lower weight and high wear resistance. It directly affects the reduction of vehicle weight and gives positive economic and environmental effects.