Paper number 513


T. Leutbecher1, D. Hülsenberg1, V. Winkler2, R. Lipfert1

1Department of Glass and Ceramic Technology, Technical University of Ilmenau
2Department of Materials Engineering, Technical University of Ilmenau
PO Box 10 05 65, D-98684 Ilmenau, Germany

Summary The introduction of Nextel 440(r) fibres for reinforcement tasks in glass matrix composites has been studied. The ceramic fibres were coated with thin layers (< 100 nm) of pyrolytic carbon to prevent diffusion between fibre and glassy matrix. The carbon coating has been produced by CVD technique or by liquid phase coating and additional pyrolyzis. At first uncoated fibre material was investigated after different heat treatments by XRD-analysis. Tensile tests with coated and uncoated fibres after heat treatments have been carried out. The ceramic fibres, protected by liquid phase coating, show lower tensile strength than coated by CVD-technology.
Carbon coated fibre reinforced glass composites were fabricated by slurry infiltration and hot-pressing. Significant increase in bending strength and work of fracture have been noticed for fibre reinforced glass matrix composites. These effects are related to the low bonding between fibre and matrix, caused by a fibre coating.
Keywords ceramic fibres, crystallization behaviour, XRD-analysis, tensile strength, glass matrix, fibre coating, liquid phase coating, pyrolytic carbon.

Theme : Ceramic Matrix and C/C Composites ; Interface and Interphase

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