耐火材料 ›› 2021, Vol. 55 ›› Issue (4): 305-308.DOI: 10.3969/j.issn.1001-1935.2021.04.007

• 研究开发 • 上一篇    下一篇

氢氧化镁粒度对刚玉-尖晶石材料结构与性能的影响

黄传(), 倪月娥, 柯昌明, 刘学新, 王景然, 张锦化()   

  1. 武汉科技大学 省部共建耐火材料与冶金国家重点实验室 湖北武汉 430081
  • 收稿日期:2021-01-29 出版日期:2021-08-15 发布日期:2021-08-22
  • 通讯作者: 张锦化,男,1981年生,副教授。E-mail: zhangjinhua@wust.edu.cn
  • 作者简介:黄传:男,1995年生,硕士研究生。E-mail: huangchuan1016@qq.com

Effect of magnesium hydroxide particle size on structure and properties of corundum-spinel materials

Huang Chuan(), Ni Yue’e, Ke Changming, Liu Xuexin, Wang Jingran, Zhang Jinhua()   

  1. The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
  • Received:2021-01-29 Online:2021-08-15 Published:2021-08-22
  • Contact: Zhang Jinhua

摘要:

以氢氧化镁和α-Al2O3微粉为原料,经过干混、成型和1 750 ℃反应烧结制备了刚玉-尖晶石骨料,研究了氢氧化镁粒度(平均粒径分别为55、36.4和10.6 μm)对刚玉-尖晶石材料体积密度、气孔率及显微结构等的影响。结果表明:随着氢氧化镁粒度的减小,试样的体积密度增加,显气孔率下降,封闭气孔增加,总气孔率和孔径逐渐下降;当氢氧化镁粒度减小时,氢氧化镁和Al2O3的分布更为均匀,有效接触面积增大,可以促进固相反应的进行,会形成更为细小的、分布更为均匀、广泛的封闭气孔;试样在500 ℃下的热导率随着氢氧化镁粒度的减小而增大。

关键词: 刚玉-尖晶石骨料, 氢氧化镁, 气孔分布, 显微结构

Abstract:

Corundum spinel aggregates were prepared using magnesium hydroxide and α-Al2O3 micropowder as starting materials,dry mixing,molding and reaction sintering at 1 750 ℃.The effect of the particle size of magnesium hydroxide (average size of 55,36.4 and 10.6 μm) on the bulk density,the porosity and the microstructure of corundum-spinel materials was studied.The results show that with the decreasing particle size of magnesium hydroxide,(1)the bulk density of corundum-spinel materials increases,the apparent porosity decreases,the closed pores increase,and the total porosity and the pore size decrease gradually;(2)the distribution of magnesium hydroxide and Al2O3 is more uniform and the effective contact area increases,which can promote the solid reaction and form finer,more uniform and extensive closed pores;(3)the thermal conductivity at 500 ℃ of the sample increases.

Key words: corundum-spinel aggregates, magnesium hydroxide, pore distribution, microstructure

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