Journal
CERAMICS INTERNATIONAL
Volume 35, Issue 6, Pages 2525-2529Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2009.01.005
Keywords
Carbon; SiC; Oxidation
Categories
Funding
- National Natural Science Foundation of China [50802075, 90716024]
- 111 Project [08040]
- NPU Foundation for Fundamental Research
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To prevent carbon/carbon (C/C) composites from oxidation, a Si-SiC coating has been prepared by a two-step pack cementation technique. Xray diffraction (XRD) and scanning electron microscopy (SEM) analysis show that the coating obtained by the first step pack cementation is a porous beta-SiC structure, and a dense structure consisting alpha-SiC, beta-SiC and Si is obtained after heat-treatment by the second step pack cementation. By energy dispersive spectroscopy (EDS) analysis, a gradient C-SiC transition layer can be formed at the C/C-coating interface. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 166 h at 1773 K in air. The weigh loss of the coated C/C is due to the formation of bubble holes on the coating surface and through-coating cracks in the coating. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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