Abstract
To improve the oxidation resistance of carbon/carbon (C/C) composites, mullite coating was prepared on the surface of SiC-coated C/C composites by supersonic plasma spraying. Phases and microstructures of mullite coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The coating primarily consists of a single phase of mullite (3Al2O3-2SiO2). The SEM results show that mullite coating was continuous and well bonded with the SiC inner layer without penetrating crack. Mullite coating exhibited good oxidation resistance. After 98.5 h oxidation at 1773 K and 9 thermal shock cycles between 1773 K and room temperature, the weight loss of the coated C/C composites was only 2.57%.
Original language | English |
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Pages (from-to) | 29-33 |
Number of pages | 5 |
Journal | Journal of Materials Science and Technology |
Volume | 29 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2013 |
Keywords
- Carbon/carbon composites
- Mullite coating
- Oxidation
- Supersonic plasma spraying