Rare-earth pyrosilicate solid-solution environmental-barrier coating ceramics for resistance against attack by molten calcia–magnesia–aluminosilicate (CMAS) glass

Turcer, Laura R.; Padture, Nitin P.

doi:10.1557/jmr.2020.132

Cited by 43 publications

(25 citation statements)

References 40 publications

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“…At 1300 °C, the reaction speed began to accelerate. The thickness of the reaction layer at different reaction times was consistent with previous studies, indicating the validity of the data [ 26 – 30 ].…”

Section: Methodssupporting

confidence: 90%

Water vapor and CMAS corrosion tests of Y2SiO5/Si thermal and environmental barrier coating

Zhang

et al. 2022

Heliyon

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Section: Methodssupporting

confidence: 90%

Water vapor and CMAS corrosion tests of Y2SiO5/Si thermal and environmental barrier coating

Zhang

et al. 2022

Heliyon

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“…[8][9][10][11] However, the temperature capability of pure Ni-based superalloys has not kept up with the development of TBCs and remains relatively stable without any apparent improvement. 12 And the difference in temperature capability between TBCs and Nibased superalloys has increased. More importantly, TBC systems and superalloys have reached their temperaturecapability limits, and their service life declines rapidly when the operating temperature of the component is higher than 1500 • C. 1 The development of new materials with higher temperature capabilities is an effective way to solve this issue.…”

Section: Introductionmentioning

confidence: 99%

“…TBCs made of Y 2 O 3 ‐stabilized ZrO 2 (7%–8 wt% YSZ) can improve the operational temperature of superalloys to 1200°C or above 8–11 . However, the temperature capability of pure Ni‐based superalloys has not kept up with the development of TBCs and remains relatively stable without any apparent improvement 12 . And the difference in temperature capability between TBCs and Ni‐based superalloys has increased.…”

Section: Introductionmentioning

confidence: 99%

Research status of bond coats in environmental barrier coatings

Zhang

Park

Zhang

et al. 2022

Int J Applied Ceramic Tech

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Bond coats in environmental barrier coatings (EBCs) prevent oxidants from penetrating the substrate, mediate the mismatch of the coefficient of thermal expansion (CTE), and improve the adhesion strength between adjacent layers. However, the development of bond coats is rarely studied systematically. In this paper, the research status of the bond coats in EBCs is introduced in detail, including the materials and deposition methods. Thus far, Si, modified‐Si, mullite, etc., have been employed as bond coats. Nevertheless, visible drawbacks of each bond coat limit their application at high‐temperatures in extreme environments. Si bond coat is easily oxidized and forms thermally grown oxides that form cracks, resulting in delamination, spallation, and failure of EBCs. In the Si–HfO2 bond coat, the optimal ratios of Si/HfO2, deposition methods, distribution of Si and HfO2, and oxidation of Si remain completely unsolved. For mullite bond coat, SiO2 suffers selective evaporation in the water vapor environment, and the ratios of the Al2O3 and SiO2 in mullite coatings restrict its service lifetime. HfSiO4 is a potential candidate acting as a next‐generation bond coat in EBCs is proposed. Furthermore, choosing reasonable deposition methods is beneficial to improve the performances of the bond coats in EBCs.

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“…With an increasing demand for high operating temperature of new gas-turbine engines, SiC-based ceramic matrix composites (SiC-CMC) have attracted great interest for their high-temperature tolerance, superior mechanical properties, and low density [1][2][3][4]. In the engine combustion environment containing hot steam or corrosives (such as sand and volcanic ash, generally known as molten salts, calcium-magnesium-alumino-silicate (CMAS)), SiC-CMC materials will undergo a severe degradation, especially accelerated oxidation caused by steam [5][6][7][8][9][10][11].…”

Section: Introduction mentioning

confidence: 99%

Pressure infiltration of molten aluminum for densification of environmental barrier coatings

et al. 2021

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Environmental barrier coatings (EBCs) effectively protect the ceramic matrix composites (CMCs) from harsh engine environments, especially steam and molten salts. However, open pores inevitably formed during the deposition process provide the transport channels for oxidants and corrosives, and lead to premature failure of EBCs. This research work proposed a method of pressure infiltration densification which blocked these open pores in the coatings. These results showed that it was difficult for aluminum to infiltrate spontaneously, but with the increase of external gas pressure and internal vacuum simultaneously, the molten aluminum obviously moved forward, and finally stopped infiltrating at a depth of a specific geometry. Based on the wrinkled zigzag pore model, a mathematical relationship between the critical pressure with the infiltration depth and the pore intrinsic geometry was established. The infiltration results confirmed this relationship, indicating that for a given coating, a dense thick film can be obtained by adjusting the internal and external gas pressures to drive a melt infiltration.

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Rare-earth pyrosilicate solid-solution environmental-barrier coating ceramics for resistance against attack by molten calcia–magnesia–aluminosilicate (CMAS) glass

Abstract: Abstract

Cited by 43 publications

References 40 publications

Water vapor and CMAS corrosion tests of Y2SiO5/Si thermal and environmental barrier coating

Water vapor and CMAS corrosion tests of Y2SiO5/Si thermal and environmental barrier coating

Research status of bond coats in environmental barrier coatings

Pressure infiltration of molten aluminum for densification of environmental barrier coatings

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