Influence of additives of bronze powder Cu-10Al-4Fe on the tribological characteristics of coatings based on the Ni-C system

DOI: 10.62564/M4-OK3414

Oleksiy Kushchev¹, Oleksandr Umanskyi¹, Oleksandr Terentiev¹, Victor Varchenko¹, Tetyana Chevichelova¹, Valery Brazhevskyi², Oleksandr Chernyshov², Ruslan Kostiunik<sup>3

1</sup>Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine
²Composite Systems Ltd, Ukraine
³National Aviation University, Ukraine


Use of plasma coatings of nickel-clad graphite powder (Ni-C) is promising for use as abradable sealing materials [1, 2, 3]. To expand the areas of application of Ni-C powder coatings, it is advisable to use them in combination with bronze [4]. For this purpose, it is proposed to use bronze powder Cu-10Al-4Fe, which has proven itself well as an antifriction material. The purpose of this work was to study the influence of the amount of bronze additives Cu-10Al-4Fe on the tribological characteristics of coatings. Plasma coatings were applied in an open atmosphere on a UPU-3D installation in a protective chamber using a Metco F4-MB plasma torch. Plasma-forming gases - mixture of argon and hydrogen. Coatings were obtained from Ni-C powder, as well as mixtures of Ni-C and Cu-10Al-4Fe powders with bronze additives in amounts of 5, 25 and 50 wt. %. Tribological tests were carried out on an M-22M friction machine. It has been established that with increasing bronze content, the abrasion resistance of the coating increases. Introduction of Cu-10Al-4Fe powder in an amount of 50% wt. into the main Ni-C powder led to a significant (~ 7 times) increase in the wear resistance of the resulting coatings. Additive 5% wt. Cu-10Al-4Fe into Ni-C powder leads to a decrease in the friction coefficient from 0.60 to 0.54. On samples of Ni-C+ 25% Cu-10Al-4Fe, a decrease in friction coefficient to 0.50 was observed Increasing the bronze content to 50% wt. in the powder composition made it possible to reduce the friction coefficient to 0.35. Conclusions. With an increase in the bronze content of Cu-10Al-4Fe to 50% wt. in the composition of Ni-C based powder, there is a tendency to improve the basic tribological characteristics of coatings, namely, wear resistance increases by 7 times, and the value of the friction coefficient decreases from 0.60 to 0.35. This makes it possible to significantly expand the scope of application of the Ni-C +Cu-10Al-4Fe material in aviation and space technology.

Keywords
abradable coatings, gas turbine engines, nickel-graphite, plasma coatings

Acknowledgments
Not provided

References
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