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Theses
Frittage, cofrittage et maîtrise des microstructures de matériaux à base d'oxydes : zircone, alumine, spinelle, alumine-zircone, spinelle-alumine
Frittage, cofrittage et maîtrise des microstructures de matériaux à base d'oxydes : zircone, alumine, spinelle, alumine-zircone, spinelle-alumine
Abstract : Densification and microstructural evolution during co-sintering of alumina (Al2O3) – zirconia (Y-ZrO2) and alumina – spinel (MgAl2O4) co-pressed bi-materials were investigated. Before co-sintering studies of bi-materials, sintering behaviors of the submicron powders of alumina, spinel and zirconia were studied separately by vertical dilatometer. The effects of precoarsening and two-step sintering treatments on the densification and microstructure of spinel ceramics were also investigated. The interface layer development between alumina and spinel during thermal treatment in 1400- 1500°C temperature range were carefully investigated. Crack-free bonds were observed in alumina – spinel bi-materials after compaction by UP+CIP. A spinel interlayer with columnar grains was observed. Growth of this interlayer from spinel toward alumina was found to follow parabolic kinetics. Diffusion couple tests produced the same columnar spinel grains at the interface with the same kinetics as in co-sintering experiments
Cited literature [90 references]
https://tel.archives-ouvertes.fr/tel-00521852
Contributor : Yannick Champion <>
Submitted on : Tuesday, September 28, 2010 - 4:43:25 PM
Last modification on : Thursday, November 19, 2020 - 3:54:15 PM
Long-term archiving on: : Thursday, October 25, 2012 - 4:15:12 PM
Contributor : Yannick Champion <>
Submitted on : Tuesday, September 28, 2010 - 4:43:25 PM
Last modification on : Thursday, November 19, 2020 - 3:54:15 PM
Long-term archiving on: : Thursday, October 25, 2012 - 4:15:12 PM