Heat protective coatings on niobium alloys





alloy, multicomponent coatings, plasma-diffusion coatings, heat strength, heat resistance


The article shows that during plasma-diffusion deposition, a multilayer coating was formed on the surface of the niobium alloy. A highly porous plasma-sprayed layer of molybdenum silicide has a significant spread in thickness (h=100...350 μm, Hμ20=6880 MPa). When studying the microstructure of samples with a plasma-diffusion coating after testing, it was found that cracks in the coating originate in the process of creep, mostly at the interface between the plasma and diffusion layers of the coating. The source of their origin is individual discontinuities in the diffusion layer as delivered. Crack propagation occurs both into the plasma and diffusion layers of the coating. Crack growth in the plasma layer is inhibited due to the rounded nature of the pores and the increased plasticity of this layer. The growth of cracks deep into the sample is, as a rule, inhibited by a boride sublayer. The advantage of plasma-diffusion technology provided an increased plasticity of the coating, the presence of thin barrier sublayers, a discontinuous coating structure, the presence of low-melting compounds that contribute to the healing of defects in the coating, an increase in its corrosion resistance and resistance to thermal fatigue destruction. The combination of these properties made it possible to provide an increase in durability compared to silicide and borosilicide coatings under conditions of isothermal creep in air (1400°C, 50 MPa) 1.9...3.7 times and under conditions of thermal cyclic creep (1400-250°C, 50 MPa) in 6.8...8.5 times. It has been determined that the use of a discrete structure will increase the thickness of the coating layer and ensure an increase in their working properties.


A.I. Borisenko, S.V. Khashkovsky, Protection of products from niobium alloys from high–temperature gas corrosion, Nauka, 1986. https://doi.org/10.1007/BF00843017

Yu.V. Dzyadykevich, “Heat–resistant coatings on niobium and alloys based on it”, Powder metallurgy, no. 1, pp. 45–52, 1986. https://doi.org/10.1007/BF00843017

Yu.V. Dzyadykevich, Protection of niobium and its alloys from oxidation, USSR Academy of Sciences, no. 3, pp. 187–190, 1987.

Yu.V. Dzyadykevich, “Protective coatings on niobium, tantalum, molybdenum and tungsten to increase resistance and high-temperature oxidation”, Powder metallurgy, no. 4, pp. 37–42, 1992.

Yu.V. Dzyadykevich, “Increasing the heat resistance of refractory metals”, Inorgan. Mater, no. 11, pp. 1405–1408, 1994.

Yu Jiadou, “Oxidation resistant coatings on refractory metals”, Actual Probl. Mod. Mater. Sci.: 1St Russ. Chin. Symp, pp. 88–89, 1992.

Yu.V. Dzyadykevich, N.I. Zablotskaya and M.V. Luchka “Influence of technological factors on the process of saturation of refractory metals with boron”, Powder Metallurgy, no. 7, pp. 70–75, 1991.

Li Xiaoxia, Zhou Chungen, “Development and oxidation resistance of B - doped silicide coatings on Nb–based alloy”, Corros. Sci. and Technol, no. 4, pp. 233–236, 2008.

A.V. Kasatkin, “Titanosilicide diffusion heat-resistant coatings on niobium”, Aviakosm. tech. and technology, no. 1, pp. 13–17, 2007.

S. Majumdar, et al., “Development of multilayer oxidation resistant coatings on niobium and tantalum”, Surface and Coat. Technol, no. 12, pp. 3713–3718, 2006. https://doi.org/10.1007/BF00843017

Xiao Lai–Gong, et al., “Silicidal coatings on niobium alloys obtained by complex saturation in powders”, J. Aeron. Mater, no. 4, pp. 36–41, 2007.

V.I. Zmiy, S.G. Rudenky, M.Yu. Bredikhin and V.V. Kupchenko, “Heat-resistant coatings on niobium and its alloys”, Powder Metallurgy, no. ¾, pp. 123–129, 2008.

O.S. Tsvikilevich and V.I. Stepanishin, “Influence of preliminary boring on heat resistance of 5VMC alloy with silicide coatings”, Phys.–Chem. fur. Mater, no. 4, pp. 17–20, 1988. https://doi.org/10.1007/BF00720639

A.A. Sharapov, O.A. Bannykh, and E.N. Sheftel, “Features of diffusion saturation of niobium alloy with a plate of liquid sodium”, Metals, no. 4, pp. 191–194, 1992.

T.A. Panayoti, “Influence of hardening and aging on the resistance to small plastic deformations of nitrided niobium and its alloy MN–1”, Metalloved. and term. processing. met., no. 7, pp. 33–36, 1995.

V. Buscaglia, et al., “Nitridation of niobium - 46 wt% titanium alloy in nitrogen at 1300ºC”, Alloys and Compounds, no. 226, pp. 232–241, 1995. https://doi.org/10.1016/0925-8388(95)01614-7

V. Buscaglia et al., “Growth of ordered lamellar precipitates during mitridation of Nb–10at% Ti at 1300 ºC, J. Alloys and Compounds, no. 1, pp. 260–264, 1999. https://doi.org/10.1016/S0925-8388(98)00891-3

L.P. Skuratov, et al., “Influence of high temperature and gaseous media on the creep of niobium”, FHMM, no. 6, pp. 98–101, 1983.

L.P. Skuratov and V.K. Yatsimirsky, “Influence of nitrogen-containing gaseous media on the physical and mechanical properties of niobium”, Problems of strength, no. 12, pp.65–67, 1988. https://doi.org/10.1007/BF01528969

Ito Yoshiyasu, “Kasivaya Hideo. Ionic nitriding of refractory metals”, Sci., no. 4, pp. 469–474, Mach 1991.

The method of surface hardening of steel parts by ion-plasma nitriding (in Ukraine ), UA. Pat. 10014, C 23 C 8/36. Dec. 15.2006.

T.A. Adamyan and S.L. Kharatyan, “On the singularity of high temperature carbidization of niobium”, J. Alloys and Compounds, no. 1–2, pp. 418–422, 2010. https://doi.org/10.1016/j.jallcom.2010.01.154

T. Murakami, et al., “Microstructure of Nb substrates coated with Mo (SiAl) 2–Al2O3 composite and B-doped Mo5Si3 layer by spark plasma sintering”, Intermetallics, no. 7–9, pp. 749–754, 2004. https://doi.org/10.1016/j.intermet.2004.02.015

P.I. Glushko, V.I. Zmiy and N.F. Kartsev, “Oxidative resistance of complex silicic coatings to niobium”, Izv. USSR Academy of Sciences. Inorganic. Materials, no. 2, pp. 331–332, 1986.

T.C. Chou. et al., “Mechanical properties and microstructures of metal/ceramic microlaminates. Part I. Nb/MoSi2 Systems”, J. Mater. Res., no. 10, pp. 2765–2773, 1992. https://doi.org/10.1557/JMR.1992.2765

P.I. Glushko, et al., “Stability and heat resistance of silicide coatings on refractory metals. III. Stability of silicide coatings on niobium under conditions of high-temperature heating in air at 1500-1800ºC”, Powder. Metallurgy, no. ¾, pp. 55–59, 2003.

A.V. Kasatkin, V.A. Pitov and V.N. Polyakov, “Composite silicide oxide coatings on refractory metals”, Phys. and chemistry processing. Mater, no. 6, pp. 51–57, 1995.

A. Mueller, et al., “Oxidation behavior of tungsten and germanium-alloyed molybdenum disilicide coatings”, Mater. Sci. and Eng. A., no. 1–2, pp. 199–207, 1992. https://doi.org/10.1016/0921-5093(92)90326-V

L.I. Emelyanova and A.I. Chernitsyn “Influence of Diffusion Oxygen Saturation on the Structure of the Surface Layer and Mechanical Properties of Niobium Alloys”, Probl. Strength, no. 1, pp. 74–78, 1978. https://doi.org/10.1007/BF01523700

N.V Alov. “Surface oxidation of metals by oxygen ion bombardment“, Nucl. Instrum. and Meth. Phys. Res. B., no. 1, pp. 337–340, 2007. https://doi.org/10.1016/j.nimb.2006.12.023

A.D Davydova, et al., “Mechanical properties of a niobium alloy with a molybdenum-hafnium-silicide coating”, Probl. strength., no. 7, pp. 70–76, 1989. https://doi.org/10.1007/BF01529615

N.I. Zarubova, Yu.P. Zotov and N.P. Kushnareva, Evaluation of the properties of the composition of the 5VMTs-silicide coating alloy by the internal friction method and chemistry of processing. Mater, no. 5, pp. 127–129, 1989.

Bukhanovskii, V.V. Effect of Silicide Ceramic Coatings on the High-Temperature Strength and Ductility of Niobium Alloy of the Nb – W – Mo – Zr System. Metal Science and Heat Treatment, no. 46, pp. 78–84, 2004. https://doi.org/10.1023/B:MSAT.0000029607.97403.94

V.V. Bukhanovsky, et al., “High-temperature strength of niobium alloy 5VMTs with silicide-ceramic protective coating”, Probl. Strength., no 2, pp. 119–129, 2004. https://doi.org/10.1023/B:STOM.0000028311.58809.f9

V.V. Bukhanovsky, et al., “High–temperature strength of niobium alloy 5VMTs with silicide–ceramic protective coating. Message 2. Characteristics of the second creep”, Probl. strength., no. 5, pp. 77–86, 2004.


Yu.M. Lakhtin, et al., “Mechanical properties of nitrided niobium alloys”, Metallurgist. and term. processing met., no. 10,

pp. 13–17, 1973. https://doi.org/10.1007/BF00656061

J. Guille and L. Matini, “Microindentation characterization of silicide coatings on niobium and titanium”, J. Maters. Sci. Lett., no. 9, pp. 952–954, 1988. https://doi.org/10.1007/BF00720739

Strength calculation and testing. Methods of accelerated test for thermocyclical creep –DSTU 2637–94, State Standard of Ukraine, Kiev, 1994.

Thermo-mechanical fatigue of aero–engine turbine blades, Metallurgia, no. 5, 1994.

V.P. Babak, et al., “Thermal barrier coatings on niobium-based alloys structural materials”, Mechanics and Advanced Technologies, Vol.86, no. 2, pp. 44–50, 2019. https://doi.org/10.20535/2521-1943.2019.86.189071

R. Heidenreich, U. Papenburg and R. Schäfer “Prüftechnik für Hochtemperatur – Konstruktionswerkstoff”, Mat.–wis. U. Werstofftech., no. 25, pp. 30–38, 1994.

B.A. Lyashenko, et al., “Optimization of coating technology according to the criteria of strength and wear resistance”, IPP, no. 3.2, pp. 53-58, 2010.

S.D. Kharchenko, “Methods for adjusting the wear–resistance of parts of the aviation technology for the test of detonation pokrittiv Cr–Si–B”, NAU, 2019.

V.P. Babak, V.P. Shchepetov and S.D. Kharchenko, “Wear resistance of self-lubricating coatings due to the formation of carbide graphite”, Mechanics and Advanced Technologies, Vol.89, no. 2, pp. 593–598, 2020. https://doi.org/10.20535/2521-1943.2020.89.211170

V.P. Babak, et al., “Suprun Intrastructural regeneration of coatings during friction”, Physical and chemical mechanics of materials, no. 1, pp. 1–6, 2019. https://doi.org/10.1007/s11003-019-00248-5

B.A. Lyashenko, O.V. Tsygulev and L.B. Kuznetsov, “Is it always necessary to increase the adhesive strength of protective coatings”, Problems of strength, no. 5, pp. 70–74, 1987. https://doi.org/10.1007/BF01524302

M.C. Ageev, et al., “Performance of protective compound coating for NCU niobium alloy evaluated by thermos–cyclic creep test method”, Material protection, no. 50(2), pp. 15–19, 2017.

B.A. Lyashenko, N.V. Novikov and S.A. Klimenko, Discrete modification of the surface layer of machine parts and tools. ISM, 2017.

V.P. Babak, V.V. Shchepetov and S.D. Kharchenko, “Antifriction Nanocomposite Coatings that Contain Magnesium Carbide”, Mechanics and Advanced Technologies, Vol. 40, no. 6, pp.593–598, 2019. https://doi.org/10.3103/S1068366619060035

Y.H. Zhang et al., “Damage mechanisms of coated systems under hermomechanical fatigue”, Mater Sci. and Technol, no. 9, pp. 1031–1036, 1999. https://doi.org/10.1179/026708399101506896

Method of applying non–critical coatings on non-metallic materials (in Ukraine), UA, Pat. 26555, bul., №152007.






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