东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (6): 814-818.DOI: 10.12068/j.issn.1005-3026.2017.06.011

• 材料与冶金 • 上一篇    下一篇

纳米镁铝尖晶石粉体的低温燃烧合成与表征

霍地1， 皮春阳1， 孙旭东1， 康雁2   

  1. (1. 东北大学 材料各向异性与织构教育部重点实验室， 辽宁 沈阳110819; 2. 东北大学 中荷生物医学与信息工程学院， 辽宁 沈阳110169)
  • 收稿日期:2016-01-20 修回日期:2016-01-20 出版日期:2017-06-15 发布日期:2017-06-11
  • 通讯作者: 霍地
  • 作者简介:霍地(1966-)，男，吉林长春人，东北大学副教授； 孙旭东(1961-)，男，吉林磐石人，东北大学教授，博士生导师；康雁(1964-)，男，辽宁沈阳人，东北大学教授，博士生导师.
  • 基金资助:

    国家自然科学基金资助项目(61372014).

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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摘要：

以硝酸盐和蔗糖为原料，利用低温燃烧合成制备纳米镁铝尖晶石(MgAl2O4)粉体，研究了不同煅烧温度、气氛以及加热速率等因素对纳米MgAl2O4粉体特性的影响.结果表明:随着前驱体煅烧温度的升高，纳米MgAl2O4晶粒尺寸逐渐增大；在O2环境中煅烧前驱体可以降低纯MgAl2O4相的形成温度，促进反应物质扩散、增大晶粒尺寸.在快速升温、蔗糖与硝酸盐物质的量比为2∶1以及通入O2的条件下，在400℃下煅烧生成MgAl2O4相，700℃时得到单相MgAl2O4纳米粉体.低温燃烧合成制备纳米MgAl2O4粉体结晶度高、晶粒尺寸细小，呈松散的软团聚态，有利于降低MgAl2O4陶瓷致密化烧结温度.

关键词: 镁铝尖晶石, 纳米粉体, 低温合成, 固相燃烧, 蔗糖

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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