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Comparison of the oxidation behaviors of SiC coatings on C/C composites prepared by pack cementation and chemical vapor deposition.
- Source :
-
Surface & Coatings Technology . Sep2016, Vol. 302, p56-64. 9p. - Publication Year :
- 2016
-
Abstract
- SiC coatings were prepared on carbon/carbon composites by pack cementation (PC) and chemical vapor deposition (CVD). The PC coating was composed of hexagonal platelets of α-SiC, while the CVD coating consisted of spherical particles of β-SiC. Their oxidation behaviors were investigated at 1173 K, 1473 K and 1773 K. Compared with the CVD-SiC coating, bubbles appeared in the PC-SiC coating at lower oxidation temperature and the oxide layer was thicker, which might be ascribed to the formation of aluminosilicate glass in the PC-SiC coating. With the increasing temperature, the oxidation behavior of the PC-SiC coating transformed from linear to parabolic with dramatically improved oxidation resistance, which might be attributed to the decreased viscosity of SiO 2 -rich glass and the good healing effect for cracks. The oxidation protective ability of the CVD-SiC coating was worse than that of the PC-SiC coating, because of the higher viscosity of pure SiO 2 glass and the inferior interface adhesion between the coating and the substrate. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02578972
- Volume :
- 302
- Database :
- Academic Search Index
- Journal :
- Surface & Coatings Technology
- Publication Type :
- Academic Journal
- Accession number :
- 117181997
- Full Text :
- https://doi.org/10.1016/j.surfcoat.2016.05.071