期刊
CERAMICS INTERNATIONAL
卷 34, 期 5, 页码 1297-1301出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2007.03.012
关键词
glass ceramics; carbon matrix composites; oxidation protection; slurry infiltration
Carbon bonded carbon fibre composites (CBCF) were modified by direct reaction with molten silicon in order to obtain a silicon carbide layer on the composite surface. Subsequently, the Si-infiltrated CBCF material was coated with a silica-based glass containing yttria and alumina by means of a slurry-dipping technique. On heat treatment the glass yielded a glass-ceramic layer thus giving a multi-layered oxidation and erosion protection system. The microstructural characterisation of the coating was conducted by standard microscopy techniques and by X-ray diffraction. The controlled crystallization of the glass-produced cristobalite, yttrium silicate (Y2Si2O7, keiviite, beta-form) and mullite as main crystalline phases. These are excellent ceramic materials for oxidation and erosion protection of SiC-coated carbon-based composites since their coefficients of thermal expansion (CTE) closely match that of SiC. The possibility of healing (closure) of micro cracks by a thermal treatment at 1375 degrees C, thus exploiting the viscous flow of the residual glass in the glass-ceramic, was explored in order to extend the service life of the protection system. (C) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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