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Open AccessArticle

YAlO3—A Novel Environmental Barrier Coating for Al2O3/Al2O3–Ceramic Matrix Composites

Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), 52425 Jülich, Germany
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Coatings 2019, 9(10), 609; https://doi.org/10.3390/coatings9100609
Received: 30 August 2019 / Revised: 19 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Environmental Barrier Coatings)
Ceramic matrix composites (CMCs) are promising materials for high-temperature applications. Environmental barrier coatings (EBCs) are needed to protect the components against water vapor attack. A new potential EBC material, YAlO3, was studied in this paper. Different plasma-spraying techniques were used for the production of coatings on an alumina-based CMC, such as atmospheric plasma spraying (APS) and very low pressure plasma spraying (VLPPS). No bond coats or surface treatments were applied. The performance was tested by pull–adhesion tests, burner rig tests, and calcium-magnesium-aluminum-silicate (CMAS) corrosion tests. The samples were subsequently analyzed by means of X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Special attention was paid to the interaction at the interface between coating and substrate. The results show that fully crystalline and good adherent YAlO3 coatings can be produced without further substrate preparation such as surface pretreatment or bond coat application. The formation of a thin reaction layer between coating and substrate seems to promote adhesion. View Full-Text
Keywords: atmospheric plasma spraying (APS); very low pressure plasma spraying (VLPPS); environmental barrier coating (EBC); YAlO3; yttrium aluminum perovskite (YAP); ceramic matrix composite (CMC); Al2O3 atmospheric plasma spraying (APS); very low pressure plasma spraying (VLPPS); environmental barrier coating (EBC); YAlO3; yttrium aluminum perovskite (YAP); ceramic matrix composite (CMC); Al2O3
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Gatzen, C.; Mack, D.E.; Guillon, O.; Vaßen, R. YAlO3—A Novel Environmental Barrier Coating for Al2O3/Al2O3–Ceramic Matrix Composites. Coatings 2019, 9, 609.

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