Vol. 1 (2025)

Articles

Study on the Influence of Al2O3 Diffusion Barrier Prepared by Atmospheric Plasma Spraying on the Interface Stability during the Preparation Process of Mo-Si-B/Nb-Si Based Alloy Coating System

Published 2025-11-28

  • Qingyan Hou
    • ,
  • Lei Jin

Qingyan Hou
Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, China

Lei Jin
Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering, AVIC Manufacturing Technology Institute, Beijing 100024, China

Abstract

The interdiffusion between Mo-Si-B coatings and Nb-Si based alloys during preparation and service at high temperatures remains a critical issue, which deteriorates the coating performance and embrittles the substrate. In this study, the atmospheric plasma spraying (APS) technology was adopted to prepare the Al₂O₃ diffusion barrier between the Mo-Si-B coating and the NB-Si-based alloy, and the influence of spark plasma sintering (SPS) pressure on the microstructure and mutual diffusion behavior of the diffusion barrier was systematically investigated. Microstructure analysis indicates that under the condition of 40 MPa and 1300ºC, the diffusion barrier remains dense and continuous, completely inhibiting the interdiffusion between the coating and the substrate. This work demonstrates, for the first time, the successful application of an APS-fabricated η- Al₂O₃ layer as an effective diffusion barrier during the SPS process, highlighting its potential for large-scale, low-cost protection of Nb-Si based alloys, with the caveat that its performance is critically dependent on the applied pressure during the preparation process.

Keywords

Atmosphere Plasma Spray (APS), Alumina Diffusion Barrier, Spark Plasma Sintering (SPS), Mo-Si-B Coating, Nb-Si Based Alloy

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References

  1. Bewlay BP, Jackson MR, Zhao JC, Subramanian PR. A Review of Very-High-Temperature Nb-Silicide-Based Composites. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 2003; 34a: 2043-2052.
  2. http://doi.org/10.1007/s11661-003-0269-8
  3. [2] Bewlay BP, Jackson MR, Zhao JC, Subramanian PR, Mendiratta MG, Lewandowski JJ, Ultrahigh-Temperature Nb-Silicide-Based Composites. MRS Bull 2011; 28: 646-653.
  4. http://doi.org/10.1557/mrs2003.192
  5. [3] Geng J, Tsakiropoulos P. A Study of the Microstructures and Oxidation of Nb–Si–Cr–Al–Mo In Situ Composites Alloyed with Ti, Hf and Sn. Intermetallics 2007; 15: 382-395.
  6. http://doi.org/10.1016/j.intermet.2006.08.016
  7. [4] Alam MZ, Venkataraman B, Sarma B, Das DK. MoSi2 Coating on Mo Substrate for Short-term Oxidation Protection in Air. Journal of Alloys Compounds 2009; 487: 335-340.
  8. [5] Wen SH, Sha JB. Isothermal and cyclic oxidation behaviours of MoSi2 with additions of B at 1250 °C prepared by spark plasma sintering. Mater Charact 2018; 139: 134-143.
  9. http://doi.org/10.1016/j.matchar.2018.02.037
  10. [6] Hou QY, Li MF, Shao W, Zhou CG. Oxidation and interdiffusion behavior of Mo-Si-B coating on Nb-Si based alloy prepared by spark plasma sintering. Corros Sci 2020; 169.
  11. http://doi.org/ARTN10863810.1016/j.corsci.2020.108638
  12. [7] Hou Q, Shao W, Li M, Zhou C. Interdiffusion behavior of Mo-Si-B/Al2O3 composite coating on Nb-Si based alloy. Surf Coat Technol 2020; 401.
  13. http://doi.org/10.1016/j.surfcoat.2020.126243
  14. [8] Hou Q, Li M, Chen Z, Zhou C. Effect of TiN diffusion barrier on interdiffusion between Mo–Si–B coating and Nb–Si based alloy. Materials Chemistry Physics and Chemistry of Glasses 2025; 337.
  15. [9] Jin L, Yu Q, Ni L, Zhou C. Microstructure and Thermal Properties of Nanostructured 8 wt.% CeO Doped YSZ Coatings Prepared by Atmospheric Plasma Spraying. J Therm Spray Technol 2012; 21: 928-934
  16. [10] Gao Y, Jie M, Liu Y. Mechanical Properties of Al2O3 Ceramic Coatings Prepared by Plasma Spraying on Magnesium Alloy. Surf Coat Technol 2017; 315: 214-219.
  17. http://doi.org/10.1016/j.surfcoat.2017.02.026
  18. [11] Deng W, Li S, Hou G, Liu X, Zhao X, An Y, Zhou H, Chen J. Comparative study on wear behavior of plasma sprayed Al2O3 coatings sliding against different counterparts. Ceram Int 2017; 43: 6976-6986.
  19. http://doi.org/10.1016/j.ceramint.2017.02.122
  20. [12] Wen SH, Zhou CG, Sha JB. Microstructural evolution and oxidation behaviour of Mo-Si-B coatings on an Nb-16Si-22Ti-7Cr-2Al-2Hf alloy at 1250 °C prepared by spark plasma sintering. Surf Coat Technol 2018; 352: 320-329.
  21. http://doi.org/10.1016/j.surfcoat.2018.08.027
  22. [13] Wen SH, Zhou CG, Sha JB. Improvement of Oxidation Resistance of a Mo-62Si-5B (at.%) Alloy at 1250 °C and 1350 °C via an In Situ Pre-Formed SiO2 Fabricated by Spark Plasma Sintering. Corros Sci 2017; 127: 175-185.
  23. http://doi.org/10.1016/j.corsci.2017.08.019
  24. [14] Igel J, Scheld WS, Mack DE, Guillon O, Vaßen R. Lifetime Extension of Atmospheric and Suspension Plasma-Sprayed Thermal Barrier Coatings in Burner Rig Tests by Pre-Oxidizing the CoNiCrAlY Bond Coats. Coatings 2024; 14: 793
  25. [15] Xu Y-X, Chirol M, Li C-J, Vardelle A. Formation of Al2O3 Diffusion Barrier in Cold-Sprayed NiCoCrAlY/Ni Multi-Layered Coatings on 304SS Substrate. Surf Coat Technol 2016; 307: 603-609.
  26. http://doi.org/10.1016/j.surfcoat.2016.09.058
  27. [16] Michalak M, Łatka L, Sokołowski P, Niemiec A, Ambroziak A. The Microstructure and Selected Mechanical Properties of Al2O3 + 13 wt % TiO2 Plasma Sprayed Coatings. Welding 2020; 10: 173.
  28. [17] Cai F, Huang X, Yang Q, Nagy D. Tribological Behaviors of Titanium Nitride- and Chromium-Nitride-Based Physical Vapor Deposition Coating Systems. Journal of Engineering for Gas Turbines and Power 2012; 134.
  29. http://doi.org/10.1115/1.4007168
  30. [18] Cremer R, Witthaut M, Reichert K, Neuschütz D. Surface and Interface Analysis of PVD Al-O-N and γ-Al2O3 Diffusion Barriers, Fresenius. Journal of Analytical Chemistry 1999; 365: 158-162.
  31. http://doi.org/10.1007/s002160051464
  32. [19] Liang T, Guo H, Peng H, Gong S. Cyclic Oxidation Behavior of an EB-PVD CoCrAlY Coating Influenced by Substrate/ coating Interdiffusion. Chinese Journal of Aeronautics 2012; 25: 796-803.
  33. http://doi.org/10.1016/s1000-9361(11)60447-0
  34. [20] Shang CH, van Heerden D, Gavens AJ, Weihs TP. An X-ray Study of Residual Stresses and Bending Stresses in Free-Standing Nb/Nb5Si3 Microlaminates. Acta Mater 2000; 48: 3533-3543.
  35. http://doi.org/10.1016/S1359-6454(00)00125-7