Creep behaviour of Si3N4/Y2O3/Al2O3/AIN alloys |
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Authors: | J Crampon R Duclos N Rakotoharisoa |
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Affiliation: | (1) Laboratoire de Structure et Propriétés de l'état Solide, URA CNRS 234, Bât C6, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France |
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Abstract: | The compression creep behaviour of pressureless sintered Y2O3/Al2O3/AIN-doped Si3N4 was studied between 1473 and 1673 K, under stresses ranging from 100–300 MPa. Strain rate versus stress and temperature analysis give a stress exponent n 1 and an activation energy Q=860 kJ mol–1. Microstructural change was investigated by transmission electron microscopy. The observed strain whorls, the stress exponent and the activation energy are indicative of a solution-diffusion-precipitation accommodated grain-boundary sliding where the diffusion through the glass is rate controlling. |
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