Optimization of wear by addition of silicon for tribological applications-A Review

friction and wear

Abstract-Zinc Aluminum Alloys over the past decayed are occupying attention of both researches and industries as a promising material for tribological applications. At this moment commercially available Zinc-Aluminum (ZA) alloys and bearing bronzes due to good cost ability and unique combination of properties. They can also be considered as competing material for cast iron, plastics and even for steels. It has been shown that the addition of alloying elements including copper, silicon, magnesium, manganese and nickel can improve the mechanical and tribological properties of zinc aluminum alloys. This alloy has still found limited applications involving high stress conditions due to its lower creep resistance, compared to traditional aluminum alloys and other structural materials especially at temperature above 100 degree Celsius. This has resulted in major loss of market potential for those alloy otherwise it is excellent material. Recently it has been shown that these problems can overcome to great extent by replacing Zinc with aluminum. Extensive research on the new alloys resulted in the development of ternary Al-40Zn-3Cu and Al-25Zn-3Cu and quaternary Al-40Zn-3Cu-2Si and Al-40Zn-3Cu-(1-3) Si alloys. They were found to be comparable to the zinc based commercial alloys as far as their specific strength and wear resistance are concerned but considerably higher ductility and dimensional change. In this paper there is discussion of the effect of Silicon on tribological properties of aluminium based Zinc alloy.

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