Journal of Northeastern University Natural Science ›› 2017, Vol. 38 ›› Issue (6): 814-818.DOI: 10.12068/j.issn.1005-3026.2017.06.011

• Materials & Metallurgy • Previous Articles     Next Articles

Low Temperature Combustion Synthesis and Characterization of Nanocrystalline Magnesium Aluminum Spinel (MgAl2O4) Powders

HUO Di1, PI Chun-yang1, SUN Xu-dong1, KANG Yan2   

  1. 1. Key Laboratory for Anisotropy and Texture of Materials
  • Received:2016-01-20 Revised:2016-01-20 Online:2017-06-15 Published:2017-06-11
  • Contact: HUO Di
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Abstract:

Nanocrystalline magnesium aluminate spinel (MgAl2O4) powders were prepared by a low temperature combustion synthesis method using nitrates and sucrose as starting materials, the characteristics of the as-synthesized powders were investigated in terms of heating temperature, environmental atmosphere and heating rate. The results show that particle sizes of MgAl2O4 spinel powder increase with the heating temperature of polymer precursors. When the precursors are heated in O2 atmosphere, the reduced formation temperature of pure MgAl2O4 phase and accelerated reactive species diffusion along with enlarged particle sizes can be achieved. Under the conditions of fast heating, 2∶1 molar ratio of sucrose to nitrates and O2 atmosphere, the formation temperature of MgAl2O4 phase is at 400℃ and further pure single phase is obtained at 700℃. The highly crystalline, soft agglomerated nano-sized MgAl2O4 powders are in favor of decreasing sintering temperature of high dense MgAl2O4 ceramics.

Key words: magnesium aluminate spinel, nanocrystalline powder, low temperature synthesis, solid state combustion, sucrose

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