Evaluation of environmental barrier coatings for SiC/SiC composites

H. Nakayama, K. Morishita, S. Ochiai, T. Sekigawa, K. Aoyama, A. Ikawa

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

2 被引用数 (Scopus)

抄録

SiC fiber reinforced SiC matrix (SiC/SiC) composites are one of the most promising materials for high temperature structural applications such as power generation and propulsion systems. SiC/SiC composites are, however, susceptible to accelerated attacks in water vapor environments through oxidation and volatilization reaction, so Environmental Barrier Coatings (EBCs) are indispensable. We have investigated some oxides and rare-earth silicates as topcoat candidates for EBCs. Topcoat materials must be stable in the high-water-vapor pressurized environments at high temperatures. Also, it is important that the thermal expansion coefficient of topcoat materials is similar to that of SiC/SiC composites. In this study, rare-earth silicates such as lutetium silicates, 8YSZ and ZrO2-SiO2 were selected as topcoat candidates. They were exposed in the water containing atmosphere at a temperature 1673K for 100 hr under a total pressure 0.96 MPa and under an atmospheric pressure. Mass changes, structure of crystals and microstructures were investigated after the exposure experiments in order to evaluate the thermal stability of those materials. After this evaluation, lutetium silicates were considered to be promising for topcoat materials. Lutetium silicates were coated on SiC/SiC composites, and their fracture toughness and microstructures were investigated and reported in this paper.

本文言語英語
ホスト出版物のタイトルAdvanced Ceramic Coatings and Interfaces - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
ページ161-170
ページ数10
3
出版ステータス出版済み - 12 1 2006
外部発表はい
イベントAdvanced Ceramic Coatings and Interfaces - 30th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, 米国
継続期間: 1 22 20061 27 2006

出版物シリーズ

名前Ceramic Engineering and Science Proceedings
番号3
27
ISSN(印刷版)0196-6219

その他

その他Advanced Ceramic Coatings and Interfaces - 30th International Conference on Advanced Ceramics and Composites
Country米国
CityCocoa Beach, FL
Period1/22/061/27/06

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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