Abstract
The fabrication of ceramic composites based on a mullite matrix uniaxially reinforced with either high strength carbon or Nicalon-SiC continuous fibres is described. Sols of high solids contents of up to 40 vol% were prepared using colloidal silica sol with either α-alumina powder or colloidal boehmite as reactants for the preparation of the mullite matrix, 3Al2O3·2SiO2. Single-stage infiltration was used for the preparation of prepregs for laminating into composites. The composites were consolidated by uniaxially hot-pressing at 1300 or 1550°C, depending on the matrix precursors and the final phases in the matrix. Highly densified composites with fibre volume fractions of 32–60% were obtained and the microstructures characterised by mercury porosimetry, X-ray diffraction, scanning electron microscopy and transmission electron microscopy.
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WU, J., JONES, F.R. & JAMES, P.F. Continuous fibre reinforced mullite matrix composites by sol–gel processing: Part I Fabrication and microstructures. Journal of Materials Science 32, 3361–3368 (1997). https://doi.org/10.1023/A:1018604229535
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DOI: https://doi.org/10.1023/A:1018604229535