Abstract
Abstract Mullite based fibre-reinforced composites having double layer fibre-coatings were produced and characterised. The multi-layer interphases were produced by a CVD-process (carbon(fugitive)/ZrO2 or Al2O3) on aluminosilicate Nextel™ 720 fibres. Composites were fabricated by infiltration of coated fibres with a pre-mullite slurry and hot-pressing in argon at 1300°C. Short term heat-treatment of composites in air yielded a gap between the fibre and the oxide layer by oxidation of the carbon layer (so-called fugitive layer). The composites were statically and cyclically heat-treated at 1300°C for 1000 h in order to identify the mechanical and microstructural changes. Mechanical characterisation of the heat-treated composites was carried out by three-point bending. The effectiveness of the fugitive layer is determined by the oxide layer and its high-temperature stability in interaction with the matrix but it also depends on the loading condition. Under cyclic heat-treatment conditions the composites are found to be more stable and damage tolerant than under constant high-temperature exposure.
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