Effects of nano-zirconia on microstructure and properties of mullite-corundum castables

doi:10.3969/j.issn.1001-1935.2026.05.004

Abstract

Abstract: To enhance their hot mechanical strength and satisfy their applicability and reliability in high-temperature industries,mullite-corundum castables were prepared using fused mullite as aggregates,corundum powder and α-Al₂O₃ powder as fine powders,ρ-Al₂O₃ powder and calcium aluminate cement as binders,and nano-ZrO₂ as the modifier.The effects of the nano-ZrO₂ additions (0,0.4%,0.8%,1.2%,1.5%,2.0%,and 3.0%,by mass) on the microstructure and properties of the castables were investigated.The results show that nano-ZrO₂ is dispersed in the matrix of the castables and promotes the nucleation and growth of calcium hexaluminate (CA₆) grains.With the increase of the nano-ZrO₂ addition,the amount of plate-like CA₆ increases,and CA₆ exhibits interlocking distribution in the matrix.Compared with the castable without nano-ZrO₂,the one with 2.0% nano-ZrO₂ demonstrates the optimal mechanical properties,while the one with 0.8% nano-ZrO₂ shows the best thermal shock resistance and slag corrosion resistance.

Key words: mullite-corundum castables, nano-ZrO₂, calcium hexaaluminate, hot modulus of rupture, corrosion resistance

摘要： 为提升莫来石-刚玉浇注料的高温力学强度,满足其在高温工业中的应用性与可靠性,以电熔莫来石为骨料,刚玉粉和α-Al₂O₃粉为细粉,ρ-Al₂O₃粉和铝酸盐水泥为结合剂,外加纳米ZrO₂为改性剂,制备莫来石-刚玉浇注料。研究纳米ZrO₂添加量(加入质量分数分别为0、0.4%、0.8%、1.2%、1.5%、2.0%和3.0%)对浇注料显微结构和性能的影响。结果表明:纳米ZrO₂分散在浇注料基质中,促进了六铝酸钙(CA₆)晶粒的形核和长大;随着纳米ZrO₂添加量的增加,板片状CA₆生成量增多,且交错分布在基质中;与未添加纳米ZrO₂的浇注料相比,添加2.0%(w)纳米ZrO₂的莫来石-刚玉浇注料的力学性能最好,添加0.8%(w)纳米ZrO₂的莫来石-刚玉浇注料的抗热震性和抗渣侵蚀性最好。

关键词: 莫来石-刚玉浇注料, 纳米ZrO₂, CA₆, 高温抗折强度, 抗侵蚀性能

CLC Number:

TQ175

Li Shien, Chen Ping’an, Qiao Mengke, Zhu Yingli, Chen Fu, Wu Jiang, Luo Gangtao, Li Xiangcheng. Effects of nano-zirconia on microstructure and properties of mullite-corundum castables[J]. Refractories, 2026, 60(5): 389-396.

李世恩, 陈平安, 乔梦珂, 朱颖丽, 陈浮, 吴江, 罗港涛, 李享成. 纳米氧化锆对莫来石-刚玉浇注料显微结构和性能的影响[J]. 耐火材料, 2026, 60(5): 389-396.

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URL: http://www.nhcl.cn/EN/10.3969/j.issn.1001-1935.2026.05.004

http://www.nhcl.cn/EN/Y2026/V60/I5/389

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