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Development of Silicates and Spraying Techniques for Environmental Barrier Coatings

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Ceramic Coatings for High-Temperature Environments

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

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Abstract

Currently, silicon carbide fibre-reinforced silicon carbide matrix ceramic matrix composites are widely used as high-temperature components for next-generation gas-turbine engines. However, hot steam and volcanic ash degrade the mechanical properties of silicon carbide. Environmental barrier coatings (EBCs) play an important role in mitigating corrosion under the harsh operating conditions required for next-generation turbines. In addition to corrosion resistance, the coefficient of thermal expansion and phase stability are important for EBC material selection to stabilise the layer structure during thermal cycling. Various silicates have been considered as candidates for EBCs, where rare-earth silicates have shown promising results. Moreover, various spraying techniques that can achieve a layered EBC structure have been considered in addition to appropriate material selection as key strategies for improving the reliability and lifetime of EBCs. Crystallisation, porosity, and crack formation caused by the formation of secondary phases due to Si evaporation are controlled by thermal spraying techniques. This chapter comprehensively evaluates the selection of silicates and spraying techniques for EBCs and discusses their prospects.

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Abbreviations

CTE:

Coefficient of thermal expansion

CMC:

Ceramics matrix composite

EBC:

Environmental barrier coating

TBC:

Thermal barrier coating

SiC:

Silicon carbide

SiCf/SiCm:

Silicon carbide fibre-reinforced silicon carbide matrix

CMAS:

Calcium magnesium aluminosilicate

Mullite:

Al6Si2O13

BSAS:

Ba1-xSrxAl2Si2O8

RE:

Rare-earth

CIP:

Cold isostatic press

HP:

Hot press

SPS:

Spark plasma sintering

APS:

Atmospheric plasma spraying

XRD:

X-ray diffraction

SEM:

Scanning electron microscope

TEM:

Transmission electron microscope

SPS:

Suspension plasma spraying

LPPS:

Low-pressure plasma spraying

HVOF:

High-velocity oxygen fuel

TGO:

Thermally grown oxide

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Acknowledgements

The authors would like to thank Editage (www.editage.jp) for English language review.

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  1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577, Japan

    Ayahisa Okawa

  2. Department of Creative Engineering, National Institute of Technology, Kushiro College, Kushiro, 084-0916, Japan

    Son Thanh Nguyen

  3. Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka, 940-2188, Japan

    Tadachika Nakayama, Hisayuki Suematsu, Takashi Goto & Koichi Niihara

Authors
  1. Ayahisa Okawa
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  2. Son Thanh Nguyen
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  3. Tadachika Nakayama
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  4. Hisayuki Suematsu
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  5. Takashi Goto
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  6. Koichi Niihara
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Corresponding author

Correspondence to Ayahisa Okawa .

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Editors and Affiliations

  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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© 2024 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Okawa, A., Nguyen, S.T., Nakayama, T., Suematsu, H., Goto, T., Niihara, K. (2024). Development of Silicates and Spraying Techniques for Environmental Barrier Coatings. 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_9

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