Abstract
The high-temperature mechanical behaviour of alumina-based ceramic fibres has been investigated by the comparison of a dense pure alumina fibre, a porous pure alumina fibre and a zirconia-reinforced dense fibre. Tensile and creep tests have been conducted up to 1300°C in air in parallel with microstructural investigations on the as-received and tested fibres. Room-temperature behaviour of the fibres is close to that of bulk materials having the same microstructure, but the fibre form allows higher failure stresses to be attained. High-temperature deformation of the three fibres is achieved by grain-boundary sliding (\(\dot \varepsilon \propto \sigma ^2 \)), and is accompanied by isotropic grain growth. The specific microstructures of each fibre induce differences in the creep threshold levels as a function of temperature and stress and also in creep rates and resistance to damage. Despite better resistance to creep and damage of the zirconia-reinforced fibre, alumina-based fibres are limited to applications below 1100°C. Grain boundaries are the principal cause of mechanical degradation at high temperature with these fibres.
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Lavaste, V., Berger, M.H., Bunsell, A.R. et al. Microstructure and mechanical characteristics of alpha-alumina-based fibres. JOURNAL OF MATERIALS SCIENCE 30, 4215–4225 (1995). https://doi.org/10.1007/BF00361500
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DOI: https://doi.org/10.1007/BF00361500