Functional-gradient coatings of the HfB₂–Si₃N₄ system with high wear resistance obtained by supersonic cold gas-dynamic spraying

The results of comprehensive studies of obtaining functionally graded coatings based on HfB₂– Si₃N₄–Zr compositions using the technology of supersonic cold gas-dynamic spraying are presented. Data are given on the measurement of adhesive strength (up to 62 MPa), microhardness (up to 42 GPa) and wear resis- tance (up to 1.2·10–9 mm/km) of the obtained coatings.

1. Andrievsky, R.A., Nanokompozity na osnove tugoplavkikh soedineniy: sostoyanie razrabotok i perspektivy [Nanocomposites based on refractory compounds: state of development and prospects], Materialovedenie, 2006, No 4 (109), pp. 20–27.

2. Andreev, A.A., Shulaev, V.M., Grigoriev, S.N., Tekhnologicheskie osobennosti polucheniya kompozitsionnykh nanostrukturirovannykh pokrytiy vakuumno-plazmennymi metodami [Technological features of obtaining composite nanostructured coatings by vacuum-plasma methods], Tekhnologiya ma- shinostroyeniya, 2005, No 7, pp. 47–52.

3. Shulaev, V.M., Vysoko- i sverkhtverdyye nanomaterialy na osnove tugoplavkikh soedineniy [High- and superhard nanomaterials based on refractory compounds], Proceedings of the 12th International Scientific and Technical Conference “High Technologies in Russian Industry”, 2006, pp. 460–466.

4. Gusev, A.I., Rampel, A.A., Nanokristallicheskie materialy [Nanocrystalline materials], Moscow: Fizmatlit, 2001.

5. Gerashchenkov, D.A., Farmakovsky, B.V., Vasiliev, A.F., Mashek, A.Ch., Is- sledovanie temperatury potoka v protsesse kholodnogo gazodinamicheskogo napyleniya funktsionalnykh pokrytiy [Investigation of the flow temperature in the process of cold gas-dynamic spraying of functional coatings], Voprosy Materialovedeniya, 2014, No 2(77), pp. 87–96.

6. Gerashchenkov, D.A., Razrabotka tekhnologicheskogo protsessa naneseniya pokrytiy metodom kholodnogo gazodinamicheskogo napyleniya na osnove armirovannykh poroshkov sistemy Al-Sn+Al2O3 [Development of a technological process for applying coatings by cold gas-dynamic spraying based on reinforced powders of the Al-Sn + Al2O3 system]: Abstract of the thesis, St Petersburg, 2015.

7. Perspektivnye napravleniya razvitiya nauki v Peterburge [Promising directions for the development of science in St. Petersburg], Zh.I. Alferov et al. (Eds.), St Petersburg: Permyakov, 2015.

8. Margolin, V.I., Potapov, A.A., Farmakovsky, B.V., Kuznetsov, P.A., Razvitie nanotekhnologiy na osnove nanokompozitov [Development of nanotechnologies based on nanocomposites], St Petersburg: LETI, 201