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Theses

Multiphase oxide ceramics in the aluminia-yttria system

Abstract : As a means of creating dispersed multiphase oxide structures, high-energy milling bas been used for pre-treating alumina-yttria powder mixtures before pressing and sintering. Initial modeling of planetary ball-milling was followed by a study of phase development and sintering of the milled Dowders. Milling injected defects into the crystal structures which were gradually destroyed and in some cases yttrium alumnium perovsklte was formed, an intermediate phase of the alumma-yttria system. ln heat treatment, transformation temperatures fell as a function of milling time and sintering properties were also improved giving relative densities as high as 96 per cent after sintering 1 h in 1500 degrees C. A dispersion of a second phase in the dominant matrix phase was observed but further improvement of the process should be needed to make it finer. The grain size could be estimated to be around 5 microns from fracture surface images.
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http://docnum.univ-lorraine.fr/prive/INPL_T_2002_ALKEBRO_J.pdf
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Submitted on : Thursday, March 29, 2018 - 12:40:23 PM
Last modification on : Thursday, March 25, 2021 - 3:01:41 AM

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Jesper Alkebro. Multiphase oxide ceramics in the aluminia-yttria system. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2002. Français. ⟨NNT : 2002INPL109N⟩. ⟨tel-01750197⟩

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