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Solid-state Reaction Preparation and Sintering Behavior of MgAl2O4 Nanopowders

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Author(s): SU Xing-Hua, LI Jian-Gong, ZHOU Zhen-Jun

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 9;
Start page: 991;
Date: 2012;
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Keywords: MgAl2O4; nanopowders; solid-state reaction; calcination; sintering

ABSTRACT
Well-crystallized MgAl2O4 nanopowders were prepared by calcining a powder mixture of Al(OH)3 and MgSO4 at 800¡䪠and then washing with water. The effect of Mg/Al atomic ratios on the particle sizes and agglomeration degrees, and sintering behavior of MgAl2O4 nanopowders were studied by differential thermal and thermogravimetric analysis (DSC/TG), X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The obtained MgAl2O4 nanopowders have an average particle size of 12 nm, a narrow size distribution, and weak agglomeration. The formation of MgAl2O4 can be attributed to a solid-state reaction betweenγ-Al2O3 and MgSO4. Besides, these MgAl2O4 nanopowders own an excellent sinterability, e.g., a relative density of 95% can be achieved after sintered at 1450¡䟦or 1 h.

Tango Jona
Tangokurs Rapperswil-Jona

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