The Current Status of Environmental Barrier Coatings and Future Direction of Thermal Spray Process

• SUZUKI Masato

  National Institute of Advanced Industrial Science and Technology (AIST)

• SHAHIEN Mohammed

  National Institute of Advanced Industrial Science and Technology (AIST)

• SHINODA Kentaro

  National Institute of Advanced Industrial Science and Technology (AIST)

• AKEDO Jun

  National Institute of Advanced Industrial Science and Technology (AIST)

Bibliographic Information

Other Title

• 耐環境コーティング技術の現状と溶射プロセス高度化の方向性
• タイカンキョウ コーティング ギジュツ ノ ゲンジョウ ト ヨウシャ プロセス コウドカ ノ ホウコウセイ

Abstract

In the next generations of turbine engines, improving the heat resistance and reducing the weight are the key essential solutions to increasing the thermal efficiency, reducing fuel consumption and CO₂ emissions. The silicon-based ceramics (ex. SiC_f/SiC ceramics matrix composites: CMCs and monolithic Si₃N₄) are the leading candidates for these applications because of the extreme light weight and superior heat resistance compared to the current Ni-based alloys. The main challenge of the Si-based ceramics is its oxidation and volatilization of the silica in the high temperature combustion gas environment with the water vapor, and thereby its rapid recession. The most promising approach is protecting the surface of the CMCs from the water vapor attack by an external environmental barrier coating layer (EBC). Since the early 1990′s a lot of efforts have been done and no single material can satisfy all the EBC requirements. Thereby, the current EBC trends are directed to the development of multilayered EBCs, with different functions as a significant solution to prevent the CMC recession and to maximize its performance for next engine generations. This paper discusses the history, current status and future trends of EBC development not only in the world but also in Japan. Furthermore, it introduces the future prospects of fine particle spraying in EBC developments.

Journal

• Journal of Japan Thermal Spray Society

  Journal of Japan Thermal Spray Society 57 (2), 76-87, 2020

  Japan Thermal Spray Society

Keywords

• turbine engines
• EBCs
• CMCs
• mullite
• BSAS
• RE-Silicates
• multilayers
• thermal expansion coefficient
• recession

Details

• CRID: 1390848250127243136
• NII Article ID: 130007871516
• NII Book ID: AN10502250
• DOI: 10.11330/jtss.57.76
• ISSN: 21861080
• ISSN: 09166076
• NDL BIB ID: 030445577
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030445577
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • Crossref
• Abstract License Flag: Disallowed