Tribological Characteristics of MAO-Coatings Modified with Al–Cu–Fe Quasicrystals

Modification of ceramic coatings developed for friction units is an important area of research aimed at improving their tribological characteristics. This paper presents ceramic coatings formed on aluminum alloys B95 and D16 by the microarc oxidation (MAO) method in a single-stage technological process with inclusions of Al–Cu–Fe quasicrystals. The technology of rubbing quasicrystals into the coating surface during final polishing was also used. Friction and wear tests were carried out according to the ASTM G99 standard paired with a tungsten carbide ball. Analysis of the surface and cross sections by the SEM microscopy method showed that the modification affects the coating structure. Quasicrystals are concentrated in the pores and participate in the friction process. Addition of small amount of modifier to the electrolyte, as well as the rubbing technology, make it possible to reduce the friction coefficient and wear rate compared to purely ceramic coatings obtained on the B95 alloy. A larger amount of modifier gives a negative result. Adding a modifier to the electrolyte when forming coatings on D16 alloy leads to an increase in the friction coefficient and a decrease in wear resistance.

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