Solid-state Reaction Preparation and Sintering Behavior of MgAl2O4 Nanopowders

doi:10.3724/SP.J.1077.2012.11725

Abstract

Abstract: Well-crystallized MgAl₂O₄ nanopowders were prepared by calcining a powder mixture of Al(OH)₃ and MgSO₄ at 800℃, 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 between γ-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℃ for 1 h.

Key words: MgAl₂O₄, nanopowders, solid-state reaction, calcination, sintering

CLC Number:

TQ174

SU Xing-Hua, LI Jian-Gong, ZHOU Zhen-Jun. Solid-state Reaction Preparation and Sintering Behavior of MgAl₂O₄ Nanopowders[J]. Journal of Inorganic Materials, 2012, 27(9): 991-996.

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Solid-state Reaction Preparation and Sintering Behavior of MgAl₂O₄ Nanopowders

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