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SiC-Si-ZrSiO4 Multiphase Oxidation Protective Coating for Carbon/Carbon Composites

Time:2012-10-23 09:12:11  From:JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY  Author:Yulei ZHANG, Hejun LI, Qiangan

SiC-Si-ZrSiO4 Multiphase Oxidation Protective Coating for Carbon/Carbon Composites

Yulei ZHANG, Hejun LI, Qiangang FU
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

Abstract
In order to improve the anti-oxidation property of carbon/carbon (C/C) composites, a novel SiC-Si-ZrSiO4 multiphase oxidation protective coating was produced on the surface of C/SiC coated carbon/carbon compos- ites by a pack cementation technique. The phase composition and microstructure of the as-prepared coatings were characterized by XRD (X-ray diraction), SEM (scanning electron microscopy) and EDS (energy dis- persive spectroscopy). Oxidation behavior of the multiphase coated C/C composites was also investigated. It showed that the as-prepared coating characterized by excellent oxidation resistance and thermal shock re- sistance could eectively protect C/C composites from oxidation at 1773 K for 57 h in air and endure the thermal cycle between 1773 K and room temperature for 12 times, whereas the corresponding weight loss is only 1.47%. The excellent oxidation protective ability of the SiC-Si-ZrSiO4 coating could be attributed to the C/SiC gradient inner layer and the multiphase microstructure of the coating.

keywords:Carbon/carbon composites; Coating; Oxidation

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