N. B. Pugacheva, P. A. Polyakov

THE EFFECT OF BORON ON THE PROTECTIVE PROPERTIES OF ALUMINIDE COATINGS

The effect of the formation, microstructure, phase composition, and protective properties of diffusion aluminide coatings alloyed with boron on the EI69 heat-resistant steel and the EI929 nickel alloy is studied. In the course of saturation, boron easily diffuses over the interstices of the B2 crystal lattice of aluminides, thus forming interstitial solid solutions. In this case, the Al content in the coating decreases, thereby implementing the possibility of increasing the plasticity of the coating while maintaining high protective properties. By binding refractory corrosive elements (Mo, W, Nb, etc.) into corrosion-resistant borides, boron increases the overall resistance of the coating in molten Na2SO4 and NaCl salts at 700 °C by an order of magnitude and improves the resistance of the surface to erosion wear. This makes it possible to recommend Al-Si-B coatings to be used for protecting the surface of the turbine blades of supercharging turbochargers and diesel exhaust valves.

Acknowledgment: This work used the equipment of the Plastometriya shared research facilities of the Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences. It was performed under a state assignment, theme No. AAAA-A18-118020790145-0.

References:

1. Sivakumar R., Mordike B.L. High temperature coatings for gas turbine blades: a review. Surface and Coatings Technology, 1989, vol. 37, iss. 2, pp. 139–160. DOI: 10.1016/0257-8972(89)90099-6.
2. Abraimov N.V., Eliseev Yu.S. Khimiko-termicheskaya obrabotka zharoprochnykh staley i splavov [Thermochemical Treatment of Heat-Resistant Steels and Alloys]. Moscow, Intermet Inzhiniring Publ., 2001, 622 p. (In Russian).
3. Guzanov B.N., Kositsyn S.V., Pugacheva N.B. Uprochnyayushchie zashchitnye pokrytiya v mashinostroenii [Reinforcing Protective Coatings in Mechanical Engineering]. Yekaterinburg, Ural Branch of the Russian Academy of Sciences Publ., 2004, 244 p. ISBN: 5-7691-1405-3. (In Russian).
4. Muboyadzhan S.A., Lesnikov V.P., Kuznetsov V.P. Kompleksnye zashchitnye pokrytiya turbinnykh lopatok aviatsionnykh GTD [Complex protective coatings for turbine blades of aircraft GTE]. Ekaterinburg, Izd. “Kvist” Publ., 2008, 208 p. ISBN: 5-900474-60-7. (In Russian).
5. Triani R.M., Gomes L.F.D.A., Aureliano R.J.T., Neto A.L., Totten G.E., Casteletti L.C., Production of aluminide layers on AISI 304 stainless steel at low temperatures using the slurry process. Journal of Materials Engineering and Performance, 2020, 29 (6), pp. 3568–3574. DOI: 10.1007/s11665-020-04748-3.
6. Liu X.M., Yi D.W., Liu B., Ma Z.W., Wan G.W. Current status and application of hot-dip aluminizing technique. Mater. Protect., 2008, 41 (4), pp. 47–50.
7. Wang X.Y., Du J.J., Ma Z.W. A One-Step Pack Cementation Method for Preparing AlN/Aluminizing Coating with Good Corrosion Resistanc. Solid State Phenomena, 2019, vol. 295, pp. 3–8. DOI: 10.4028/www.scientific.net/SSP.295.3.
8. Pugacheva N.B. Current Trends in the Development of Heat-Resistant Coatings Based on Iron, Nickel and Cobalt Aluminides. Diagnostics, Resource and Mechanics of materials and structures, 2015, iss. 3, pp. 51–82. DOI: 10.17804/2410-9908.2015.3.051-082. Available at: https://dream-journal.org/DREAM_Issue_3_2015_Pugacheva_N._B._051_082..pdf
9. Samsonov G.V. and Vinnitskii I.M. Tugoplavkie soedineniya [High-Melting Compounds]. Moscow, Metallurgiya Publ., 1976.
10. Voroshnin L.G. Borirovanie promyshlennykh staley i chugunov [Borating of industrial steels and cast irons]. Minsk, Belarus Publ., 1981, 205 p.
11. Khimushin F.F. Zharoprochnye stali i splavy [Heat Resistant Steels and Alloys]. Moscow, Metallurgiya Publ., 1969.
12. Movchan B.A., Malashenko I.S. Zharostoykie pokrytiya, osazhdaemye v vakuume [Vacuum-Deposited Heat-Resistant Coatings]. Kiev, Naukova Dumka Publ., 1983, 232 p.
13. Lakhtin Yu.M., Borodin V.A., Kogan Ya.D., Kostina L.A., Ivanov E.V. Ocheretin Yu.A. Comparative tests of heat-resistant coatings on nickel alloy ZhS6K.  Zashchita metallov, 1978, 14 (4), pp. 499–491.
14. Minkevich A.N. Khimiko-termicheskaya obrabotka metallov i splavov [Chemical and Thermal Treatment of Metals and Alloys]. Moscow, Mashinostroenie Publ., 1965.
15. Borisenok S.G., Vasil’ev L.A., Voroshnin L.G. et al. Khimiko-termicheskaya obrabotka metallov i splavov: Spravochnik [Chemicothermal Treatment of Metals and Alloys: A Handbook]. Moscow, Metallurgiya Publ., 1981.
16. Nakhmanson M.S., Antoshulskiy A.G. A procedure for computer-aided calculation of cell parameters from X-ray diffraction patterns of powders. Apparatura i Metody Rentgenovskogo Analiza, 1985, iss. 33, pp. 104–115.
17. Oryshich I.V. Development of methods for testing heat-resistant alloys in molten salts. Zashchita metallov, 1981, vol. 17, No. 1, pp. 74–79. (In Russian).
18. Pugacheva N.B., Bykova T.M. A Study of Boriding Methods, An Analysis of the Structure and Properties of the Obtained Coatings. Diagnostics, Resource and Mechanics of materials and structures, 2020, iss. 2, pp. 38–60. DOI: 10.17804/2410-9908.2020.2.038-060. Available at: https://dream-journal.org/issues/2020-2/2020-2_285.html
19. Gol'dshmidt Kh. Dzh. Splavy vnedreniya [Interstitial alloy, Engl. transl.]. Moscow, Mir Publ., 1971.

Article reference