Growth of MgAl2O4/MgO eutectic crystals by the micro-pulling-down method and its characterization |
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| Affiliation: | 1. Snecma (Safran), site d''Evry-Corbeil, rue Henri Auguste Desbruères, 91003 Evry Cedex, France;2. Université de Lorraine, Institut Jean Lamour, UMR7198, Faculté des Sciences et Techniques, Boulevard des Aiguillettes, BP70239, 54506 Vandoeuvre-lès-Nancy Cedex, France;1. Application Laboratory of Chemical & Natural resources and environmental substances, Department of Chemistry, Faculty of Sciences Bizerte, 7021 Jarzouna, Bizerte, Tunisia;2. Laboratory for Analysis Methods and Techniques, INRAP, 2020 Sidi Thabet, Tunisia;3. Laboratoire Production, 7000, Les Ciments de Bizerte, Tunisia;1. I3N, Department of Physics, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;2. CICECO, Department of Materials and Ceramic Engineering, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal |
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| Abstract: | MgAl2O4/MgO eutectic fibers and rods have been grown successfully by the micro-pulling-down method, and the microstructures and optical characterizations of grown crystals were performed. MgAl2O4/MgO eutectic fibers of 0.3–1 mm in diameter and about 500 mm in length, and the rods having 5 mm in diameter with approximately 60 mm in length have been grown with the 6–120 mm/h of growth speed. The eutectic fibers showed homogeneous microstructure in which MgO fiber/whisker aligned to the growth direction in the MgAl2O4 (spinel) matrix. The grown crystals looked semitransparence under naked eyes. Optical and orientational characterizations were performed. The second phase of MgO was easily removed by selective etching with hydrochloric acid, and then porous single crystalline bodies were obtained. |
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