4.5 Review

Research status of bond coats in environmental barrier coatings

Related references

Note: Only part of the references are listed.
Article Materials Science, Ceramics

On the oxidation of the silicon bond coat in environmental barrier coatings

Roy M. Sullivan

Summary: Deal and Grove's formulation is applied to model the oxidation process of the silicon bond coat in environmental barrier coatings. The study found that the effective permeability of the oxidant in the coating is crucial under the vacancy diffusion assumption. The linear-parabolic growth equation is still applicable for the oxidation of the silicon bond coat, with a modified parameter A to account for the presence of the coating.

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Development of oxide-based High temperature environmental barrier coatings for ceramic matrix composites via the slurry process

Kang N. Lee et al.

Summary: An advanced environmental barrier coating (EBC) for SiC based composites was developed using a slurry process, with Yb2Si2O7 and mullite chosen as base materials for the bond coat. Various sintering aids enabled sintering at high temperatures, and the coatings showed good oxidation resistance and stability in steam oxidation tests. Additionally, kinetic analysis revealed that oxidant permeation through the silica scale is the rate controlling factor for TGO growth rates.

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Micromechanical analysis and theoretical predictions towards thermal shock resistance of HfO2-Si environmental barrier coatings

Ruixiang Liu et al.

Summary: The study focused on the physical properties and thermal shock performance of HfO2-Si composite coatings at high temperature, showing better crack resistance than pure Si bond coat. However, excessive volume expansion during particle ripening led to interface separation issues after 100 cycles. Further modification for low-frequency vibration patterns of HfSiO4 and improving interfacial metallurgical bonding are suggested for enhancing the thermal expansion coefficient and interface adhesion of HfO2-doped Si composite coatings.

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Steam oxidation of ytterbium disilicate environmental barrier coatings with and without a silicon bond coat

Ken A. Kane et al.

Summary: By testing different structures of environmental barrier coatings in high temperature and steam environments, it was found that the silica scale formed by the single layer ytterbium disilicate (YbDS) coating was more uniform, thinner, and exhibited better crack resistance compared to the multilayered coating.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2021)

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A review on environmental barrier coatings: History, current state of the art and future developments

Daniel Tejero-Martin et al.

Summary: This review presents the degradation mechanisms of SiC/SiC ceramic matrix composites in harsh environments, the role of environmental barrier coatings, and outlines the latest research directions for potential next-generation EBCs.

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Microstructure and phase composition evolution of silicon-hafnia feedstock during plasma spraying and following cyclic oxidation

Emine Bakan et al.

Summary: In this study, silicon-hafnia feedstock was plasma sprayed to form Environmental Barrier Coating bond coat. The analysis showed that above 700 degrees C, HfSi2 oxidizes and HfO2 transforms into monoclinic phase, leading to non-linear expansion behavior. After 100 hours at 1300 degrees C, the coating cracked extensively due to the formation of SiO2 and HfSiO4 during cyclic oxidation.

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A duplex bond coat approach to environmental barrier coating systems

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Summary: SiC composites are vulnerable to volatilization of their protective SiO2 surface oxide in water vapor rich combustion environments, and are typically protected by a silicon bond coat and ytterbium disilicate (Yb2Si2O7: YbDS) environmental barrier coating system. A duplex silicon-HfO2 bond coat is investigated as a potential solution, which reduces the average SiO2 thickness and improves the durability of the coating system.

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Perspectives on Environmental Barrier Coatings (EBCs) Manufactured via Air Plasma Spray (APS) on Ceramic Matrix Composites (CMCs): A Tutorial Paper

Kang N. Lee et al.

Summary: The literature contains numerous information on the significant achievements in aerospace gas turbine engines through the use of CMCs and EBCs in their hot zones. These achievements include weight reduction, lower fuel consumption, higher operation temperatures, superior thrust-to-weight ratio, and decreased emission of toxic gases. However, it is often unclear to readers how these achievements are realized together.

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Interface evolution of Si/Mullite/Yb2SiO5 PS-PVD environmental barrier coatings under high temperature

Xiaofeng Zhang et al.

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