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

Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-1), 52425 Jülich, Germany
German Aerospace Center, Institute of Structures and Design, 70569 Stuttgart, Germany
Author to whom correspondence should be addressed.
Academic Editor: Yasutaka Ando
Coatings 2017, 7(4), 55;
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)
PDF [13311 KB, uploaded 25 April 2017]


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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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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