Effect of magnesia-zirconia powder on properties of corundum-spinel based castables

doi:10.3969/j.issn.1001-1935.2026.05.005

Abstract

Abstract: To develop high-performance chrome-free purging plugs,corundum-spinel castables were prepared using tabular corundum,sintered corundum,pure calcium aluminate cement,magnesia-zirconia powder,and premixed fine powders (spinel powder,tabular corundum,white corundum,alumina-rich spinel powder,and α-Al₂O₃ micropowder) as raw materials.The effects of magnesia-zirconia powder addition (0,0.5%,1.0%,1.5%,2.0%,2.5%,3.0%,and 3.5%,by mass) on the cold physical properties and thermal shock resistance of the corundum-spinel castables were investigated.The results show that after the heat treatment at 1 550 ℃,with the increasing magnesia-zirconia powder addition,ZrO₂ is uniformly distributed in the matrix;MgAl₂O₄ and CA₆ interlock with ZrO₂ in the matrix,making the structure denser;the permanent linear change decreases;and the strength of the samples increases.In addition,adding an appropriate amount of magnesia-zirconia powder significantly improves the thermal shock resistance of the samples.For the sample with 3.5% magnesia-zirconia powder,the retention ratio of the cold modulus of rupture reaches 63%,which is significantly higher than that of the sample without magnesia-zirconia powder.Considering overall performance and cost,the purging plug prepared with the castable formulation containing 3.5% magnesia-zirconia powder was trial-used in an LF refining ladle.Its service life was basically comparable to that of the chrome-containing purging plugs currently used in the steel plant,reaching 48-50 heats.

Key words: magnesia-zirconia powder, castables, corundum-spinel, thermal shock resistance

摘要： 为了开发高性能无铬透气砖,以板状刚玉、烧结刚玉、纯铝酸盐水泥、镁锆粉以及预混合细粉(尖晶石粉、板状刚玉、白刚玉、富铝尖晶石粉和α-Al₂O₃微粉)为原料,制备了刚玉-尖晶石质浇注料,探讨了镁锆粉加入量(加入质量分数分别为0、0.5%、1.0%、1.5%、2.0%、2.5%、3.0%和3.5%)对刚玉-尖晶石质浇注料常温物理性能及抗热震性能的影响。结果表明:1 550 ℃热处理后,随着镁锆粉加入量的增多,ZrO₂能均匀地分布在基质中,MgAl₂O₄及CA₆在基质中与ZrO₂穿插结合,结构更加致密,加热永久线变化降低,试样的强度提高;此外,加入一定量的镁锆粉可以明显改善试样的抗热震性,镁锆粉加入量为3.5%(w)试样的常温抗折强度保持率高达63%,较未添加镁锆粉试样的明显提升。综合各项性能及成本考虑,镁锆粉加入量为3.5%(w)的浇注料配比制备的透气砖在LF精炼钢包上试用,其与钢厂现用含铬透气砖的使用寿命基本相当,达48~50次。

关键词: 镁锆粉, 浇注料, 刚玉-尖晶石质, 抗热震性

CLC Number:

TQ175

Lei Yutian, Nie Jianhua, Chen Ruifeng, Zhang Xiaoxu, Liang Yonghe. Effect of magnesia-zirconia powder on properties of corundum-spinel based castables[J]. Refractories, 2026, 60(5): 397-401.

雷宇湉, 聂建华, 陈瑞峰, 张小旭, 梁永和. 镁锆粉对刚玉-尖晶石质浇注料性能的影响[J]. 耐火材料, 2026, 60(5): 397-401.

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URL: http://www.nhcl.cn/EN/10.3969/j.issn.1001-1935.2026.05.005

http://www.nhcl.cn/EN/Y2026/V60/I5/397

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