Abstract
Improvement of technological machines and equipment is accompanied by a tightening of the conditions of their operation. The machine parts work under severe conditions and often break down due to wear of the working surfaces. Thus, currently there is an urgent need to improve the physical-mechanical properties of the detail surfaces. In practice, this is achieved by various methods of surface hardening, including the plasma deposition of wear-resistant coatings. The formation of wear-resistant coatings of multi-component powder materials is a very promising method for improving the quality of plasma coatings. The important advantage of the use of this method is the ability to control the structure in a wide range by using the powder composites with different chemical composition. Obviously, the nature of the plasma coating structure predeter-mines the all complex of its physical, mechanical and operational properties. Therefore, the aim of this research is the structure investigation of one of the variants of wear-resistant plasma coat-ings of mechanical two-component powder mixtures based on the oxide ceramic with different contents of nickel and cobalt powders. One of the most promising ways for improving the quality of wear-resistant plasma coatings through the application of multi-component mechanical mix-tures of different powder materials has been considered in this work. The typical plasma coating structures of mechanical nickel- and cobalt-ceramic mixtures and the raster scans of sprayed coating surfaces are shown. Research results shown, that the mutual enveloping of the powder mixture particles and low porosity are observed in the coatings. However, the percentage content of the ceramic in the coatings noticeably less than in the initial mixture due to the effect of com-ponent segregation during plasma spraying of coating.

References
1. Chesov Yu.S., Zverev E.A. Issledovanie iznosostoikosti pokrytii, nanesennykh metodom plazmennogo napyleniya [Research of wear-resistance of the coatings received by the method of plasma spraying]. Nauchnyi vestnik Novosibirskogogosudarstvennogo tekhnicheskogo universiteta – Science bulletin of the Novosibirsk state technical university, 2008, no. 3 (32), pp. 175–181.

2. Chesov Yu.S., Zverev E.A. Vliyanie tekhnologicheskikh faktorov plazmen-nogo napyleniya na svoistva pokrytii iz poroshkovogo materiala marki PG-S27 [Influence of technology factors of plasma spraying on properties of powder coatings of mark PG-S27]. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) – Metal Working and Material Science, 2009, no. 3 (44), pp. 15–17.

3. Chesov Yu.S., Zverev E.A., Plokhov A.V. Struktura plazmennykh iznosos-toikikh pokrytii iz poroshkovogo materiala marki PG-S27 [Structure of plasma wear-resistant coatings of powdered PG-S27 type material]. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) – Metal Working and Material Science, 2010, no. 1 (46), pp. 14–18.

4. Chesov Yu.S., Zverev E.A., Prokop'ev N.L., Vaganov A.S., Antokhina N.V., Plokhov A.V. [Research of properties of plasma-sprayed wear-resistant coat-ings of the PG-S27 powder]. Resursosberegayushchie tekhnologii remonta, voss-tanovleniya i uprochneniya detalei mashin, mekhanizmov, oborudovaniya, instru-menta i tekhnologicheskoi osnastki ot nanodo makrourovnya. Materialy 12 mezhdunarodnoi nauchno-prakticheskoi konferentsii, 13–16 aprelya 2010 g. V 2 ch. [Resource-Saving Technologies of Repair, Restoration and Strengthening of Machine Parts, Mechanisms, Equipment, Tools and Production Tools from the Nano to Macro Level. Proceedings of 12th International Scientific and Practical Conference], St. Petersburg, 13–16 April 2010, pt. 1, pp. 201–207. 

5. Chesov Yu.S., Zverev E.A. Metodika naneseniya plazmennykh iznosostoi-kikh pokrytii [Technique of wear-resistant plasma coating spraying]. Nauchnyi vestnik Novosibirskogo gosudarstvennogo tekhnicheskogo universiteta – Science bulletin of the Novosibirsk state technical university, 2014, no. 2 (55), pp. 156–165.

6. Puzryakov A.F. Teoreticheskie osnovy tekhnologii plazmennogo napyleniya [Theoretical foundations of plasma spray technology]. Moscow, Bauman MSTU Publ., 2008. 357 p. 7. Borisov Yu.S., Kharlamov Yu.A., Sidorenko S.L., Ardatovskaya E.N. Gaz-otermicheskie pokrytiya iz poroshkovykh materialov: spravochnik [Gas-Thermal coatings of powder materials: guide]. Kiev, Naukova dumka Publ., 1987. 544 p.

8. ChesovYu.S., Zverev E.A., Vakhrushev N.V., Vaganov A.S. [Comparative tests of wear-resistant plasma coatings formed on the basis of mechanical mixtures of different powder materials]. Innovatsii v mashinostroenii – osnova tekhnicheskogo razvitiya Rossii. Materialy VI mezhdunarodnoi nauchno-tekhnicheskoi kon-ferentsii, 23–26 sentyabrya 2014 g. [Innovations in mechanical engineering – a basis of technical development of Russia. Proceedings of VI International Scientific and Technical Conference], Barnaul, Russia, 23–26 September 2014, pp. 211–215.

9. Chesov Yu.S., Zverev E.A., Tregubchak P.V. Tekhnologicheskoe obespech-enie kachestva plazmennykh pokrytii [Technological assurance of quality of plasma coatings]. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) – Metal Working and Material Science, 2012, no. 1 (54), pp. 10–13. 10. Chesov Yu.S., Zverev E.A., Tregubchak P.V., Vakhrushev N.V. Issledovanie protsessov predvaritel'noi mekhanicheskoi obrabotki pod napylenie gaz-otermicheskikh pokrytii [Research of mechanical preprocessing necessary for spraying of gas-thermal coatings]. Aktual'nye problemy v mashinostroenii – Actual Problems in Machine Building, 2014, no. 1, pp. 90–95.

11. Chesov Yu.S., Zverev E.A., Plotnikova N.V., Vakhrushev N.V., Vaga- nov A.S., Bandyurov I.V. Struktura iznosostoikikh plazmennykh pokrytii iz nikel'-keramicheskoi smesi [The structure of wear-resistant plasma coatings based on the nickelceramic mixture]. Aktual'nye problemy v mashinostroenii – Actual Problems in Machine Building, 2015, no. 2, pp. 405–409.