可水合氧化铝添加量对中温处理后刚玉浇注料强度和显微结构的影响

doi:10.3969/j.issn.1001-1935.2023.01.004

耐火材料 ›› 2023, Vol. 57 ›› Issue (1): 15-19.DOI: 10.3969/j.issn.1001-1935.2023.01.004

可水合氧化铝添加量对中温处理后刚玉浇注料强度和显微结构的影响

李耀征¹⁾, 张举²⁾, 王赛鑫²⁾, 周文英²⁾, 穆元冬²⁾, 陈留刚²⁾, 叶国田²⁾

1)郑州城市职业学院材料工程学院河南郑州 452370
2)郑州大学材料科学与工程学院河南郑州 450001

收稿日期:2022-04-20 出版日期:2023-02-15 发布日期:2023-02-21
作者简介:李耀征:男,1987年生,硕士研究生。E-mail:402488527@qq.com
基金资助:
国家自然科学基金项目(52172030)。

Effect of hydratable alumina additions on strength and microstructure of corundum castables after medium temperature treatment

Li Yaozheng, Zhang Ju, Wang Saixin, Zhou Wenying, Mu Yuandong, Chen Liugang, Ye Guotian

School of Materials Engineering,City University of Zhengzhou,Zhengzhou 452370,Henan,China

Received:2022-04-20 Online:2023-02-15 Published:2023-02-21

摘要/Abstract

摘要： 为弄清可水合氧化铝(HA)结合浇注料中温强度低的原因,以板状刚玉、活性氧化铝粉、HA为原料制备刚玉浇注料。研究了HA添加量(w,1%、3%、6%、9%)和热处理温度(110 ℃保温24 h,400、600、800、1 000、1 100 和1 250 ℃保温5 h)对浇注料强度和显微结构的影响。结果表明:1)养护和干燥过程中,HA通过水化反应生成蜂窝状产物勃姆石和拜耳石,起到结构骨架的作用,为浇注料提供强度。2)HA结合浇注料在1 000 ℃热处理后强度最低;在低于1 000 ℃时,热处理温度的升高会逐渐破坏水化产物的结构,降低浇注料的强度;高于 1 000 ℃时,浇注料基质中发生了局部烧结,使得强度有所回升。3)提高HA的加入量无法提升浇注料的中温强度,说明中温热处理使得HA的水化产物结构完全坍塌,无法起到结构支撑的作用。

关键词: 可水合氧化铝, 刚玉浇注料, 强度, 显微结构, 中温, 水化产物

Abstract: In order to find out the reason for the low strength of HA-bonded castables at intermediate temperatures,corundum castables were prepared using tabular corundum,active alumina powder,and hydratable alumina (HA) as raw materials.The effects of different HA additions (1%,3%,6%,and 9%,by mass) and the heat treatment temperature (drying at 110 ℃ for 24 h,heat treatment at 400,600,800,1 000,1 100 or 1 250 ℃ for 5 h) on the strength and the microstructure of the castables were studied.The results show that:(1)during the curing and drying process,HA generates honeycomb products boehmite and bayerite through hydration,which act as the structural skeleton and provide strength for castables;(2)HA-bonded castables have the lowest strength after the heat treatment at 1 000 ℃;with the increase of the heat treatment temperature below 1 000 ℃,the structure of hydrates is damaged gradually,thus reducing the strength of the castables;when the heat treatment temperature is higher than 1 000 ℃,partial sintering occurs in the castable matrix,enhancing the strength a little bit;(3)the strength of castables at intermediate temperatures cannot be improved by increasing the addition of HA,indicating that the hydration product structure of HA collapses completely due to the thermal treatment at intermediate temperatures,which could not play the role of structural support.

Key words: hydratable alumina, corundum castables, strength, microstructure, intermediate temperature, hydration products

中图分类号:

TQ175

李耀征, 张举, 王赛鑫, 周文英, 穆元冬, 陈留刚, 叶国田. 可水合氧化铝添加量对中温处理后刚玉浇注料强度和显微结构的影响[J]. 耐火材料, 2023, 57(1): 15-19.

Li Yaozheng, Zhang Ju, Wang Saixin, Zhou Wenying, Mu Yuandong, Chen Liugang, Ye Guotian. Effect of hydratable alumina additions on strength and microstructure of corundum castables after medium temperature treatment[J]. Refractories, 2023, 57(1): 15-19.

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可水合氧化铝添加量对中温处理后刚玉浇注料强度和显微结构的影响

Effect of hydratable alumina additions on strength and microstructure of corundum castables after medium temperature treatment

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