Tailoring protective coatings for all‐oxide ceramic matrix composites in high temperature‐/high heat flux environments and corrosive media

Braue, W.; Mechnich, Peter

doi:10.1002/mawe.200700184

Cited by 5 publications

(2 citation statements)

References 17 publications

(19 reference statements)

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“…Among these materials, yttria-stabilized zirconia (YSZ) coatings have been intensively investigated, since YSZ is the material of choice for thermal barrier coatings (TBCs). The suitability of plasma-sprayed, sputtered, and electron-beam physical vapor deposition (EB-PVD) YSZ coatings on wound highly porous oxide (WHIPOX) [12] has been studied by Braue et al and Mechnich et al [13][14][15]. To increase the bonding between substrate and coating, a reaction-bonded alumina (RBAO) [16] bond coat had to be used.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…A step forward can be made by the use of new base materials with improved high temperature capabilities . Currently SiC fiber/SiC matrix composites and oxide fiber/oxide matrix composites (mainly Al 2 O 3 ) are candidates for hydrocarbon fueled turbine applications at hot stage parts . Since Al 2 O 3 is an oxide ceramic, it is very resistant to oxidation, while SiC tends to oxidize at high temperatures and form a SiO 2 protective layer on the surface.…”

Section: Introductionmentioning

confidence: 99%

Water vapor corrosion test using supersonic gas velocities

et al. 2019

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Testing of the corrosion resistance of environmental barrier coating (EBC) systems is necessary for developing reliable coatings. Unfortunately tests under realistic gas turbine conditions are difficult and expensive. The materials under investigation as well as parts of the test setup have to withstand high temperatures (≥1200°C), high pressure (up to 30 bar) as well as the corrosive atmosphere (H2O, O2, NOx). Therefore most lab scale test‐rigs focus on simplified test conditions. In this work water vapor corrosion testing of EBCs with a high velocity oxy fuel (HVOF) facility is introduced which combines high temperatures and high gas velocities. It leads to quite high recession rates in short periods of time, which are comparable to results from literature. It was found that high flow velocities can easily compensate low gas pressures. HVOF‐testing is a simple and fast way to measure the recession rate of an EBC‐system. As proof of concept the recession rates of an oxide/oxide CMC with and without EBC were measured.

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WHIPOX®: Ein faserverstärkter oxidkeramischer Werkstoff für Hochtemperatur– Langzeitanwendungen

Göring¹,

Hackemann

Kanka

2007

Materialwissenschaft Werkst

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In the last years the all oxide fiber reinforced ceramic matrix composite WHIPOX J (Wound Highly Porous Oxide CMC) have been developed to fabricate mature components. Besides the applications in the field of aircraft and space technology, which are developed in interdisciplinary projects at DLR, the material was successfully tested for "spin-off" applications. The specific and unique combination of physical and mechanical properties enables new and innovative solutions for problems with materials in industrial furnaces, metallurgical equipments, filter technologies, fire prevention, catalytic converters, soot filters, electro technology and medical applications. High speed burner injectors for industrial furnaces are produced in licence by an industrial ceramic manufacturer.

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Tailoring protective coatings for all‐oxide ceramic matrix composites in high temperature‐/high heat flux environments and corrosive media

Cited by 5 publications

References 17 publications

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

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

Water vapor corrosion test using supersonic gas velocities

WHIPOX®: Ein faserverstärkter oxidkeramischer Werkstoff für Hochtemperatur– Langzeitanwendungen

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