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Environmental Barrier Coatings (EBCs) for Silicon-Based Ceramics and Composites

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Ceramic Coatings for High-Temperature Environments

Part of the book series: Engineering Materials ((ENG.MAT.))

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Abstract

Silicon-based ceramics and composites are promising materials for hot-section structural components of high-temperature turbines due to their excellent mechanical properties at elevated temperatures. However, corrosive gas and foreign particles in the service environment, such as water vapor/oxygen and some silicate dusts may attack silicon-based ceramics, which finally result in lifetime recession and sometimes severe failure. Therefore, Environmental Barrier Coatings (EBCs) have been proposed to isolate these corrosive media. EBCs system has developed over several decades to the most common structure consisting of bond coat/interlayer/topcoat. Main performance requirements for EBCs include low-thermal conductivity, thermal expansion coefficients matched with silicon-based Ceramic Matrix Composites (CMCs), and chemical compatibility with CMCs. Meanwhile, higher fracture toughness and bonding strength with CMCs can prolong the service life of EBCs. Therefore, EBCs are usually composed of three layers: the bonding layer, interlayer, and topcoat. Nowadays, EBCs have promoted to the third generation. The topcoat of EBCs in direct contact with the environment is crucial. Rare-earth silicates are considered as the most promising materials of the EBCs topcoats, owing to their appropriate thermophysical properties and excellent chemical compatibility. Additionally, mullites or rare-earth disilicates are usually selected as the interlayer material, meanwhile the bonding layer is generally silicon. During high-temperature service, corrosive media sometimes destroy the integrity of EBCs. In order to improve the service life of EBCs, different strategies have been adopted, such as solid-solutionizing treatment and high-entropy engineering. The thermal protective system of EBCs for silicon-based ceramics and composites has been developed rapidly to the promising rare-earth silicates as topcoats for the requirements of long-term service. Based on explorations of high-temperature corrosion mechanisms under attacks of water vapor and CMAS, scientists are still struggling to perfect EBCs by different strategies in order to meet the needs of practical applications.

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Abbreviations

APS:

Atmospheric plasma spraying

BSAS:

Barium-strontium aluminosilicate

CMAS:

Calcia-magnesia-aluminosilicate

CMCs:

Ceramic matrix composites

CTEs:

Coefficients of thermal expansion

EBCs:

Environmental barrier coatings

EB-PVD:

Electron beam physical vapor deposition

PS-PVD:

Plasma spray-physical vapor deposition

T/EBCs:

Thermal/environmental barrier coatings

TBC:

Thermal barrier coating

TGOs:

Thermal growth oxides

YSZ:

Yttria-stabilized zirconia

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Acknowledgements

The financial support from the National Science and Technology Major Project (2017-VI-0020-0093) and the Heilongjiang Postdoctoral Science Foundation are gratefully acknowledged.

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  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Jia-Hu Ouyang, Gui Cao & Shu-Qi Wang

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  1. FunGlass—Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Trenčín, Slovakia

    Amirhossein Pakseresht

  2. FunGlass—Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, Trenčín, Slovakia

    Kamalan Kirubaharan Amirtharaj Mosas

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Ouyang, JH., Cao, G., Wang, SQ. (2024). Environmental Barrier Coatings (EBCs) for Silicon-Based Ceramics and Composites. In: Pakseresht, A., Amirtharaj Mosas, K.K. (eds) Ceramic Coatings for High-Temperature Environments. Engineering Materials. Springer, Cham. https://doi.org/10.1007/978-3-031-40809-0_8

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