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Coatings 2017, 7(4), 55; doi:10.3390/coatings7040055

Application of High-Velocity Oxygen-Fuel (HVOF) Spraying to the Fabrication of Yb-Silicate Environmental Barrier Coatings

1
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-1), 52425 Jülich, Germany
2
German Aerospace Center, Institute of Structures and Design, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Yasutaka Ando
Received: 22 February 2017 / Revised: 9 April 2017 / Accepted: 12 April 2017 / Published: 18 April 2017
(This article belongs to the Special Issue Thermal Spray Technology)
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Abstract

From the literature, it is known that due to their glass formation tendency, it is not possible to deposit fully-crystalline silicate coatings when the conventional atmospheric plasma spraying (APS) process is employed. In APS, rapid quenching of the sprayed material on the substrate facilitates the amorphous deposit formation, which shrinks when exposed to heat and forms pores and/or cracks. This paper explores the feasibility of using a high-velocity oxygen-fuel (HVOF) process for the cost-effective fabrication of dense, stoichiometric, and crystalline Yb2Si2O7 environmental barrier coatings. We report our findings on the HVOF process optimization and its resultant influence on the microstructure development and crystallinity of the Yb2Si2O7 coatings. The results reveal that partially crystalline, dense, and vertical crack-free EBCs can be produced by the HVOF technique. However, the furnace thermal cycling results revealed that the bonding of the Yb2Si2O7 layer to the Silicon bond coat needs to be improved. View Full-Text
Keywords: environmental barrier coatings (EBC); ytterbium silicate; high-velocity oxygen-fuel (HVOF) environmental barrier coatings (EBC); ytterbium silicate; high-velocity oxygen-fuel (HVOF)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bakan, E.; Mauer, G.; Sohn, Y.J.; Koch, D.; Vaßen, R. Application of High-Velocity Oxygen-Fuel (HVOF) Spraying to the Fabrication of Yb-Silicate Environmental Barrier Coatings. Coatings 2017, 7, 55.

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