Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 209, Issue 7, Pages 3438-3443Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2008.08.002
Keywords
C/SiC composites; Ablation mechanism; Oxyacetylene torch
Funding
- national natural science foundation of china [50571045/E011002]
- Nanjing University of Aeronautics and Astronautics
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C/SiC composites were prepared by polycarbosilane infiltration pyrolysis and ablated by oxyacetylene flame at 1800 degrees C for 180s. Morphology and microstructure of C/SiC have been studied by scanning electron microscopy/energy dispersive spectroscopy, and X-ray diffraction analysis. Two concentric ring regions appeared on the surface of the ablated C/SiC. In the Centre region of the ablated C/SiC was composed of irregular SiC particles with a lot of pores. The pores were resulted from (i) gas expansion in closed pores during ablation, and (ii) from the release of SiO gas produced by the oxidation of SiC with sufficiently low oxygen partial pressure. The results indicated the ablation was due to a combination of oxidation, mechanical erosion and recrystallization of the surface SiC. (c) 2008 Elsevier B.V. All rights reserved.
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