Microstructure and isothermal oxidation of 3Al2O3·2SiO2/SiC coating on high and low density carbon-carbon composites

Carbon-carbon composite (C/C) materials are prone to severe oxidation and volatilization problems. To address these issues, mullite (3Al 2 O 3 ·2SiO 2 )/silicon carbide (SiC) coatings were deposited on C/C composite substrates characterized into high and low densities. The coatings were applied by a...

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Bibliographic Details
Published in:Journal of Central South University 2013, Vol.20 (1), p.30-36
Main Authors: Gbologah, L., Xiong, Xiang, Hao, Han-lin, Zeng, Yi, Zhang, Wu-zhuang
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary:Carbon-carbon composite (C/C) materials are prone to severe oxidation and volatilization problems. To address these issues, mullite (3Al 2 O 3 ·2SiO 2 )/silicon carbide (SiC) coatings were deposited on C/C composite substrates characterized into high and low densities. The coatings were applied by a two-step approach: pack cementation and silica sol based slurry coating processes. The relationship between the microstructure of 3Al 2 O 3 ·2SiO 2 /SiC coatings and C/C substrates during isothermal oxidation cycle at 1 500 °C was investigated using X-ray diffractometer (XRD) and scanning electron microscope (SEM) mounted with energy dispersive spectrometer (EDS). The results indicate that the density of the substrates has a marked effect on the coatings. Dense, thick and well-bonded coatings are obtained in the high density substrate. After 106 h of isothermal oxidation, the high density substrate with 3Al 2 O 3 ·2SiO 2 /SiC coating offers effective protection as compared to low density substrate suffering recession.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-013-1455-5