Author: A.A. Lepeshev, E.A.Rozhkova, I.V. Karpov, A.V.Ushakov, L.Y.Fedorov

Instit: Siberian Federal University

Quasi-crystalline alloys, characterized by an unusual quasi-periodic structure and a fifth-order symmetry axis ”forbidden“ in crystallography, have a unique set of chemical and physico-mechanical properties.

In this regard, the quasi−crystalline alloys of the Al−Cu—Me system (where Me is Fe, Cr, Mn, V) are indicative, which, with a relatively small specific gravity, have high values of chemical resistance, modulus of elasticity, hardness, wear resistance and low coefficient of friction. The development of compositions and processing technologies for such alloys opens up wide opportunities for their use as antifriction materials in friction units. At the same time, high efficiency of friction pairs can be achieved both through the use of composites with a quasicrystalline alloy hardener, and directly by spraying quasicrystalline coatings.

Powder metallurgy and, in particular, plasma spraying should be attributed to one of the most promising methods for manufacturing assemblies from quasi-crystalline alloys.

Using the technological capabilities of this method, it is possible in the process of spraying quasi-crystalline coatings not only to control their structure and phase composition, but also to directionally form composite compositions with a given ratio of the base material and additives of a quasi-crystalline alloy.