SiC/Yb₂SiO₅ Multilayer Coatings for Oxidation Protection of C_f/SiC Composites

Author

Haiming Wen, Missouri University of Science and TechnologyFollow
Shaoming Dong
Yusheng Ding
Xiangyu Zhang
Ping He
Le Gao

Abstract

Ytterbium silicate (Yb₂SiO₅) is a promising oxidation protective coating material for C fiber-reinforced SiC (C_f/SiC) composites. Firstly, the SiC bond coat was prepared on C_f/SiC composites by pulse CVD. The single-phase Yb₂SiO₅ powders of 200~300 nm in size were synthesized by sol-gel process. Then for the first time, the SiC-Yb₂SiO₅ intermediate coat was applied on the SiC coated C_f/SiC composites through PCS-SiC-Yb₂SiO₅ slurry application. The incorporation of PCS could significantly improve the adhesion of the coating because of the great stickiness of PCS and its ability to form SiC ceramic in situ after pyrolysis. The Yb₂SiO₅ slurry with low viscosity and high solid content was prepared, and the dense Yb₂SiO₅ top coat with fine crystallites was fabricated by dip-coating and subsequent sintering. The oxidation tests at 1500°C in stationary air indicate that the fabricated SiC/Yb₂SiO₅ multilayer coatings possess a outstanding oxidation resistance.

Recommended Citation

H. Wen et al., "SiC/Yb₂SiO₅ Multilayer Coatings for Oxidation Protection of C_f/SiC Composites," Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering, vol. 38, no. 9, pp. 1580 - 1583, Rare Metals Materials and Engineering Press, Sep 2009.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

1002-185X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

Chinese

Rights

© 2009 Rare Metals Materials and Engineering Press, All rights reserved.

Publication Date

01 Sep 2009