热处理温度对矾土基莫来石材料结构及晶体生长的影响

doi:10.3969/j.issn.1001-1935.2023.04.009

耐火材料 ›› 2023, Vol. 57 ›› Issue (4): 314-319.DOI: 10.3969/j.issn.1001-1935.2023.04.009

热处理温度对矾土基莫来石材料结构及晶体生长的影响

麦海香¹⁾, 赵飞¹⁾, 安建成^2),3), 王亚利³⁾, 连伟康³⁾, 胡杨¹⁾, 葛铁柱¹⁾, 刘新红¹⁾

1)郑州大学河南省高温功能材料重点实验室河南郑州 450052
2)北京金隅通达耐火技术有限公司北京 100085
3)阳泉金隅通达高温材料有限公司山西阳泉 045000

收稿日期:2022-08-16 出版日期:2023-08-15 发布日期:2023-08-30
通讯作者: 赵飞,男,1982年生,博士,工程师。E-mail:zhaofeiln@zzu.edu.cn
作者简介:麦海香:女,1997年生,硕士研究生。E-mail:202012192013580@gs.zzu.edu
基金资助:
国家自然科学基金资助项目(51872266)。

Effect of heat-treatment temperature on crystal growth and structure of bauxite based mullite materials

Mai Haixiang, Zhao Fei, An Jiancheng, Wang Yali, Lian Weikang, Hu Yang, Ge Tiezhu, Liu Xinhong

First author’s address:Henan Key Laboratory of High Temperature Functional Ceramics,Zhengzhou University,Zhengzhou 450052,Henan,China

Received:2022-08-16 Online:2023-08-15 Published:2023-08-30

摘要/Abstract

摘要： 为了优化矾土基莫来石材料的性能,以Al₂O₃含量约为70%(w)的Ⅱ等高铝矾土为原料,采用湿法均化、高温热处理工艺制备矾土基莫来石试样,研究了热处理温度(空气气氛下分别在1 350～1 650 ℃保温4 h)对试样物相组成与显微结构的影响,并探讨了柱状莫来石晶体的生长机制。结果表明,莫来石符合固-液环境下生长发育的特征:1)1 350~1 500 ℃时,大量Al₂O₃溶解至SiO₂非晶质中加快了二次莫来石化反应进程,该阶段液相的过饱和度较高,莫来石晶粒伴随有台阶生长的特征;2)在重结晶烧结阶段(1 500~1 650 ℃),结晶相的增加消耗了液相中的Al₂O₃,液相过饱和度降低,莫来石晶体表现出螺旋位错为主的生长特征;3)随热处理温度的升高(1 350~1 650 ℃),试样中的液相黏度降低,从而减少了晶体各向异性生长的阻力,使莫来石晶粒逐渐发育成长柱状并形成连续交叉的网络结构。

关键词: 高铝矾土, 矾土基莫来石材料, 晶体结构, 晶体生长

Abstract: In order to optimize the properties,bauxite based mullite materials were prepared by wet homogenization and high-temperature treatment,using high alumina bauxite (grade Ⅱ,Al₂O₃ content of about 70 mass%) as the raw material.Effect of the heat-treatment temperature (hold at 1 350-1 650 ℃ for 4 h in air atmosphere) on the phase composition and microstructure of the samples was studied,and the growth mechanism of columnar mullite crystals was discussed.The results show that the mullite conforms to the growth characteristics in a solid-liquid environment:(1)at 1 350-1 500 ℃,a large amount of Al₂O₃ dissolves into amorphous SiO₂,which accelerates the secondary mullitization;at this stage,the supersaturation of the liquid phase is high,and the mullite grains are accompanied by the step growth characteristic;(2)during the re-crystallization sintering stage (1 500-1 650 ℃),the increase of the crystalline phase consumes Al₂O₃ in the liquid phases,so the liquid phase supersaturation decreases,and the mullite grains exhibit a screw dislocation growth characteristic;(3)as the heat-treatment temperature increases (1 350-1 650 ℃),the viscosity of the liquid phase decreases,thereby reducing the resistance of crystal anisotropic growth,the mullite grains gradually develop into columnar shapes and form a continuous intersecting network structure.

Key words: high-alumina bauxite, bauxite based mullite material, crystal structure, crystal growth

中图分类号:

TQ175.71

麦海香, 赵飞, 安建成, 王亚利, 连伟康胡杨, 葛铁柱, 刘新红. 热处理温度对矾土基莫来石材料结构及晶体生长的影响[J]. 耐火材料, 2023, 57(4): 314-319.

Mai Haixiang, Zhao Fei, An Jiancheng, Wang Yali, Lian Weikang, Hu Yang, Ge Tiezhu, Liu Xinhong. Effect of heat-treatment temperature on crystal growth and structure of bauxite based mullite materials[J]. Refractories, 2023, 57(4): 314-319.

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热处理温度对矾土基莫来石材料结构及晶体生长的影响

Effect of heat-treatment temperature on crystal growth and structure of bauxite based mullite materials

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