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Morphology and Microstructure of Three‐Dimensional Orthogonal C/SiC Composites Ablated by an Oxyacetylene Flame at 2900°C
Author(s) -
Chen Zhaofeng,
Yan Bo
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02297.x
Subject(s) - materials science , microstructure , composite material , pyrolysis , coating , scanning electron microscope , sublimation (psychology) , acetylene , chemical vapor infiltration , morphology (biology) , chemical engineering , psychology , chemistry , organic chemistry , engineering , psychotherapist , biology , genetics
C/SiC composites were prepared by polycarbosilane infiltration pyrolysis and ablated by oxy‐acetylene flame at 2900°C for 180 s. The morphology and microstructure of C/SiC were observed by scanning electron microscopy. The phase transition and the composition were confirmed by energy‐dispersive spectroscopy and X‐ray diffraction. The ablation rates of the center region and the outer region were 2.5 and 1.1 μm/s, respectively. The ablated C/SiC was covered by a turbostratic carbon coating resulting from the pyrolysis of acetylene. White dross attached on the surface was composed of SiO 2 resulting from the sublimation and decomposition of SiC during ablation and oxidization of Si and SiC during cooling. The results indicated that the ablation was due to a combination of carbon coating deposition, decomposition of SiC, oxidation, and mechanical erosion.