无机材料学报 ›› 2012, Vol. 27 ›› Issue (9): 991-996.DOI: 10.3724/SP.J.1077.2012.11725 CSTR: 32189.14.SP.J.1077.2012.11725

• 研究论文 • 上一篇    下一篇

固相反应法制备MgAl2O4纳米粉体及其烧结行为研究

苏兴华1, 李建功2, 周振君1   

  1. (1. 长安大学 材料科学与工程学院, 西安 710061; 2. 兰州大学 材料科学与工程研究所, 兰州 730000)
  • 收稿日期:2011-11-18 修回日期:2012-01-04 出版日期:2012-09-20 网络出版日期:2012-08-28
  • 基金资助:

    国家自然科学基金(51102022); 高等学校博士学科点专项科研基金(20110205120001); 中国博士后科学基金(2011M501426); 中央高校基本科研业务费专项基金(CHD2012ZD015, CHD2011JC134); 长安大学基础研究支持计划专项基金

Solid-state Reaction Preparation and Sintering Behavior of MgAl2O4 Nanopowders

SU Xing-Hua1, LI Jian-Gong2, ZHOU Zhen-Jun1   

  1. (1. School of Materials Science and Engineering, Chang’an University, Xi’an 710061, China; 2. Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China)
  • Received:2011-11-18 Revised:2012-01-04 Published:2012-09-20 Online:2012-08-28
  • Supported by:

    National Natural Science Foundation of China (51102022); Specialized Research Fund for the Doctoral Program of Higher Education (20110205120001); China Postdoctoral Science Foundation (2011M501426); Special Fund for Basic Scienti?c Research of Central Colleges, Chang’an University (CHD2012ZD015, CHD2011JC134); Special Fund for Basic Research Support Programs of Chang’an University

摘要: 在800℃下煅烧Al(OH)3和MgSO4混合粉末, 冷却后经过水洗得到了结晶良好的MgAl2O4纳米粉体. 采用DSC/TG、XRD、TEM和SEM等分析手段研究了混合粉末中Mg/Al原子比对颗粒尺寸及团聚状况的影响, 以及MgAl2O4纳米粉体的烧结性能. 所制备的MgAl2O4纳米粉体平均颗粒尺寸为12 nm, 尺寸分布窄, 团聚少. MgAl2O4的生成归因于γ-Al2O3和MgSO4的固相反应. MgAl2O4纳米粉体显示了良好的烧结活性, 在1450℃烧结1 h即能获得相对密度为95%的MgAl2O4陶瓷.

关键词: MgAl2O4, 纳米粉体, 固相反应, 煅烧, 烧结

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

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