Ceramic fibre reinforced refractory castables for very high temperature superplastic forming
Résumé
In the frame of the development of very high temperature die material solutions, two grades of alumina based ceramic fibres with a diameter close to 12 mu m have been investigated as reinforcement solutions for an andalusite refractory castable. High temperature mechanical tests were performed up to 1200 degrees C in four-point bending conditions: rupture tests at high temperature and anisothermal creep tests. After testing, microstructural and rupture surface were observed in order to get information on deformation mechanisms and rupture processes. Results show that significant mechanical improvement were obtained up to 1100 degrees C when compared to non reinforced refractory castables.
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