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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11767

Title: Microstructure and isothermal oxidation of 3Al2O3·2SiO2/SiC coating on high and low density carbon-carbon composites
Authors: Gbologah, Lemuel
Xiong, Xiang
Hao, Han-lin
Zeng, Yi
Zhang, Wu-zhuang
Keywords: mullite
carbon-carbon composite
slurry coating
isothermal oxidation
Issue Date: 10-Jan-2013
Publisher: Central South University
Citation: Gbologah, L., Xiong, X., Hao, H. et al. J. Cent. South Univ. (2013) 20: 30. https://doi.org/10.1007/s11771-013-1455-5
Abstract: Carbon-carbon composite (C/C) materials are prone to severe oxidation and volatilization problems. To address these issues, mullite (3Al2O3·2SiO2)/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 3Al2O3·2SiO2/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 3Al2O3·2SiO2/SiC coating offers effective protection as compared to low density substrate suffering recession.
Description: Research Article
URI: http://hdl.handle.net/123456789/11767
Appears in Collections:College of Arts and Social Sciences

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