MICROSTRUCTURE AND SINTERING BEHAVIOR OF MULLITE-ZIRCONIA COMPOSITES 6th International Conference on Processing and Manufacturing of Advanced Materials ; Berlin, GERMANY - AUG 25-29, 2009
| Autor: | Sahnoune, F., Saheb, N., Chegaar, M., Goeuriot, Patrice |
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| Přispěvatelé: | UMR 5146 - Laboratoire Claude Goux (LCG-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département Mécanique et Procédés d'Elaboration (MPE-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | THERMEC 2009, PTS 1-4 THERMEC 2009, PTS 1-4, 2010, 638-642, pp.979-984 Part 1-4. ⟨10.4028/www.scientific.net/MSF.638-642.979⟩ |
| DOI: | 10.4028/www.scientific.net/MSF.638-642.979⟩ |
| Popis: | International audience; In the present work, the structure and sintering behaviour of mullite-zirconia composites were investigated The composites were prepared by reaction sintering of Algerian kaolin, alpha-Al(2)O(3), and stabilized zirconia (3Y-TZP). The raw materials were wet ball milled in a planetary ball mill followed by attrition The green samples shaped using a uniaxial press were sintered between 1100 degrees C and 1600 degrees C for 2 hours. The density was measured by the water immersion method. Phases present and change of the average crystallite size of the mullite phase as a function of sintering temperature and ZrO(2) content were characterized through X-ray diffraction. Mulite grains had whiskers' shape; however, the increase of ZrO(2) content changed the morphology of grains to near spherical shape. The microstructure of the samples revealed uniform distribution of ZrO(2) particles; also, aluminium was uniformly distributed on all grains exception on zirconia grains. At least a relative density of 95 % was achieved for all samples at a relatively lower sintering temperature of 1500 degrees C. In composites containing up to 16 wt. % ZrO(2), the zirconia phase retained its tetragonal structure and the transformed part did not exceed 3 % However, with the addition of 32 wt. % ZrO(2) around 66% of the tetragonal structure changed to monoclinic structure |
| Databáze: | OpenAIRE |
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