Effect of Double Electron Beam Remelting on Microstructure of HVOF and CGDS Bond Coat

Abstract:

This work focuses to investigate the influence of the parameters used in electron beam (EB) remelting including the effect of double remelting of CoNiCrAlY coatings fabricated on Nickel based super alloy substrates by using the high velocity oxygen-fuel (HVOF) and cold gas dynamic spraying (CGDS) methods. The microstructures of as sprayed and remelted coatings were investigated by scanning electron microscopy and the phase analysis by X-ray diffraction (XRD). The results obtained show that there are advantages at using the pulsed EB surface modification technique. Double EB treatment provides a smooth surface and low porosity level and at last but not least this study demonstrate that low-temperature processing of CoNiCrAlY bond coat represents an interesting and promising alternative for their manufacturing.

• Periodical: Materials Science Forum (Volume 891)
• Pages: 574-578
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.891.574
• Online since: March 2017
• Authors: Petra Gavendová Krajňáková*, Ivo Dlouhy, Jan Čížek, Jan Čupera, Ruslan Shvab
• Keywords: Cold Gas Dynamic Spray, CoNiCrAlY Coatings, Electron Beam Remelting, High Velocity Oxygen-Fuel

References

[1] G. Marginean, D. Utu, Cyclic oxidation behavior of different treated CoNiCrAlY coatings, Applied Surface Science 258 (2012) 8307-8308.

DOI: 10.1016/j.apsusc.2012.05.050

[2] W. Brandl, D. Toma, H.J. Grabke, The characteristics of alumina scales formed on HVOF-sprayed MCrAlY coatings, Surface and Coatings Technology 108-109 (1998) 10-15.

DOI: 10.1016/s0257-8972(98)00613-6

[3] P. Richer, M. Yandouzi, L. Beauvais, B. Jodoin, Oxidation behavior of CoNiCrAlY bond coats produced by plasma, HVOF and cold gas dynamic spraying, Surface and Coatings Technology 204 (2010) 3962-3974.

DOI: 10.1016/j.surfcoat.2010.03.043

[4] L. Ajdelsztajn, B. Jodoin, J.M. Schoenung, Synthesis and mechanical properties on nanocrystalline Ni coatings produced by cold gas dynamic spraying, Surface and Coatings Technology 201 (2006) 1166-1172.

DOI: 10.1016/j.surfcoat.2006.01.037

[5] W.R. Chen, E. Irissou, X. Wu, J.G. Legoux, B.R. Marple: submitted to Journal of Thermal Spray technology (2010).

[6] P. Gavendová, J. Čížek, J. Čupera, M. Hasegawa, I. Dlouhý, Microstructure modification of CGDS and HVOF sprayed CoNiCrAlY bond coat remelted by electron beam, procedia materials Science 12 (2016) 89-94.

DOI: 10.1016/j.mspro.2016.03.016

[7] D. Utu, G. Marginean, W. Brandl, I. Cartis, Improvement of the oxidation behavior of electron beam remelted MCrAlY coatings, Solid State Science 7 (2005) 459-464.

DOI: 10.1016/j.vacuum.2004.09.006