Improving sliding wear resistance of Al-Mg parts by plasma spraying

Abstract

Durable coatings, which would combine good technological properties, high hardness with excellent tribological characteristics, are of great interest for engineering fi elds where working parts are produced from aluminium and its alloys. In present work, plasma spray technology was used as a means to increase durability of Al-Mg alloy parts. NiCrSiBFe coatings deposited on aluminium alloy substrate at different thickness were studied. Before spraying, the surfaces of aluminium alloy were modifi ed usin g different surface pretreatment methods. The phase composition, microstructure, microhardness, porosity and adhesion of deposited coatings were characterized. Ball-on-plate wear tests with NiCrSiBFe coatings were carried out in dry and lubricated conditions, using SEM to characterise the worn track and the wear mechanism.