添加Al粉、Si粉对镁铝尖晶石质免烧耐火材料结构与性能的影响

doi:10.3969/j.issn.1001-1935.2022.05.003

耐火材料 ›› 2022, Vol. 56 ›› Issue (5): 380-385.DOI: 10.3969/j.issn.1001-1935.2022.05.003

添加Al粉、Si粉对镁铝尖晶石质免烧耐火材料结构与性能的影响

周连卓, 王周福, 王玺堂, 刘浩, 马妍, 全正煌

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:2021-11-13 出版日期:2022-10-15 发布日期:2022-11-07
作者简介:周连卓:男,1995年生,硕士研究生。E-mail:zhoulianzhuo@foxmail.com
基金资助:
国家自然科学基金资助项目(U20A20239,51672195和51474166)。

Effect of Al powder and Si powder addition on structure and properties of unburned magnesium aluminate spinel refractories

Zhou Lianzhuo, Wang Zhoufu, Wang Xitang, Liu Hao, Ma Yan, Quan Zhenghuang

The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Received:2021-11-13 Online:2022-10-15 Published:2022-11-07

摘要/Abstract

摘要： 采用烧结镁铝尖晶石为主要原料,以酚醛树脂为结合剂,分别以2%、4%和6%(w)的Al粉,以及在4%(w)的Al粉基础上复合添加1%、2%(w)的Si粉为添加剂,制备了镁铝尖晶石质免烧耐火材料试样,研究了不同热处理温度(1 000、1 400和1 600 ℃分别保温3 h)下Al粉、Si粉添加剂对镁铝尖晶石质免烧耐火材料性能及结构的影响。结果表明,Al粉添加剂的引入能大幅提高试样1 000和1 400 ℃烧后的常温抗折强度,同时在基质中形成AlN增强相,大幅提高了试样在1 400 ℃下的高温抗折强度,但1 600 ℃热处理后,对强度影响不大;Al粉、Si粉复合添加剂会在基质中形成低熔点化合物,大幅降低了Al粉、Si粉复合添加试样的高温抗折强度,但低熔点相的存在促进了烧结,提高了其致密度和常温抗折强度,且降低了其升温过程中的体积变化,其在各个温度热处理后常温抗折强度均高于添加Al粉试样的。

关键词: Al粉, Si粉, 镁铝尖晶石, 免烧耐火材料, 强度

Abstract: Unburned magnesium aluminate spinel refractories were prepared using sintered magnesium aluminate spinel as the main raw material,phenolic resin as the binder,aluminum powder (2%,4%,and 6%,by mass) and silicon powder (when Al powder addition is 4%,Si powder addition varies:1% and 2%,by mass) as additives.The effects of the aluminum powder and silicon powder addition on the properties and the microstructure of the refractories heat treated at different temperatures (1 000,1 400,and 1 600 ℃ for 3 h) were studied.The results show that the Al powder addition can greatly enhance the cold modulus of rupture of the samples fired at 1 000 or 1 400 ℃,and meanwhile AlN reinforcement phase forms in the matrix,which greatly improves the hot modulus of rupture of the samples at 1 400 ℃;however,the heat treatment at 1 600 ℃ has little influence on the strength;the addition of aluminum powder and silicon powder result in the formation of low melting point phases,greatly reducing the hot modulus of rupture.However,the low melting point phases promote sintering,which enhances the density and the cold modulus of rupture,and decreases the volume change during heating.The specimens added with aluminum and silicon all have higher cold modulus of rupture than those added with Al powder only.

Key words: aluminum powder, silicon powder, magnesium aluminate spinel, unburned refractories, strength

中图分类号:

TQ175

周连卓, 王周福, 王玺堂, 刘浩, 马妍, 全正煌. 添加Al粉、Si粉对镁铝尖晶石质免烧耐火材料结构与性能的影响[J]. 耐火材料, 2022, 56(5): 380-385.

Zhou Lianzhuo, Wang Zhoufu, Wang Xitang, Liu Hao, Ma Yan, Quan Zhenghuang. Effect of Al powder and Si powder addition on structure and properties of unburned magnesium aluminate spinel refractories[J]. Refractories, 2022, 56(5): 380-385.

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添加Al粉、Si粉对镁铝尖晶石质免烧耐火材料结构与性能的影响

Effect of Al powder and Si powder addition on structure and properties of unburned magnesium aluminate spinel refractories

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