Thermal behaviour of advanced composite materials based on SiC fibres |
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| Authors: | Balek V. Mitsuhashi T. Šubrt J. Bakardjieva S. Málek Z. |
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| Affiliation: | (1) Nuclear Research Institute, CZ-250 68 Řež, Czech Republic;(2) 305-0044 Tsukuba 1-1 Namiki National Institute for Materials Science National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;(3) Institute of Inorganic Chemistry, CZ-250 68 Řež, Czech Republic |
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| Abstract: | Emanation thermal analysis (ETA) was used for characterization of thermal behaviour of SiCf/SiC composites on heating in argon and air, respectively. Effect of gas environment (argon, air) and helium ions implantation on the microstructure development of the SiCf/SiC composite prepared by chemical vapour infiltration (CVI) from Nicalon CG fibres was investigated under in situ conditions of heating. The annealing of near surface structure irregularities was observed in the range 280-700°C and evaluated by means of the mathematical model, assuming that the structure irregularities served as diffusion paths for radon. The ETA reflected the formation of amorphous silica and its subsequent crystallization to crystoballite. Morphology of the SiCf/SiC samples before and after the heat treatments was characterized by means of SEM. This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | SiC/SiCf radon emanation thermal analysis annealing near surface layers structure irregularities |
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