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Research Article | Open Access

Fabrication and oxidation resistance of mullite/yttrium silicate multilayer coatings on C/SiC composites

Qingsong MA( ), Lihui CAI
Science and Technology on Advanced Ceramic Fibers &Composites Laboratory, National University of Defense Technology, Changsha 410073, China
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Abstract

A tri-layer coating of mullite/Y2Si2O7/(70wt%Y2Si2O7+30wt%Y2SiO5) was prepared on carbon fiber reinforced silicon carbide (C/SiC) composite substrate through dip-coating route for the sake of improving oxidation resistance of C/SiC composites. An Al2O3-SiO2 sol with high solid content was selected as raw material for mullite, and a slurry of Y2O3 powder filled silicone resin was used to synthesize yttrium silicate. The microstructure, phase composition, and oxidation resistance of the coating were investigated. The as-fabricated coating shows high density and favorable bonding to C/SiC substrate. After oxidation at 1400 and 1500 ℃ for 30 min under static air, the flexural strengths of coated C/SiC composite were both increased by ~30%. The desirable thermal stability and the further densification are responsible for excellent oxidation resistance. With the additional help of compatible thermal expansion coefficients among substrate and sub-layers in coating, the coated composite retained 111.2% of original flexural strength after 12 times of thermal shock in air from 1400 ℃ to room temperature. The carbothermal reaction at 1600 ℃ between free carbon in C/SiC substrate and rich SiO2 in mullite resulted in severe frothing and desquamation of coating and obvious degradation in oxidation resistance.

Keywords

oxidation resistancethermal shock resistancecoatingsmulliteyttrium silicateC/SiC composites

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Journal of Advanced Ceramics
Volume 6 Issue 4,
December 2017
Pages 360-367
DOI: 10.1007/s40145-017-0248-y
Cite this article:
MA Q, CAI L. Fabrication and oxidation resistance of mullite/yttrium silicate multilayer coatings on C/SiC composites. Journal of Advanced Ceramics, 2017, 6(4): 360-367. https://doi.org/10.1007/s40145-017-0248-y

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Received: 16 May 2017
Revised: 18 July 2017
Accepted: 12 September 2017
Published: 19 December 2017
© The author(s) 2017

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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