Effect of phase evolution and microstructure on thermal shock resistance and hydration resistance of low-carbon MgO-C refractories: Al-TiB2 hybrid addition

被引:3
作者
Liu, Jiangao [1 ]
Chen, Min [1 ]
Wang, Nan [1 ]
Sui, Xi [1 ]
机构
[1] Northeastern Univ, Sch Met, Key Lab Ecol Met Multimet Mineral, Shenyang 110819, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
Low-carbon MgO-C refractories; Thermal shock resistance; Hydration resistance; Al-TiB2; additive; In-situ synthesized ceramic phase; AL; BEHAVIOR; AL4O4C; RESIN;
D O I
10.1016/j.conbuildmat.2025.140141
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The thermal shock resistance (TRS) is essential to the service life of low-carbon MgO-C refractories. In the experiment, the low-carbon MgO-C refractories with the excellent TRS and the hydration resistance (HR) were obtained by using an Al-TiB2 additive instead of the traditional Al additive. The results showed that the TiB2 improved the binding affinity between Al and O, causing the formation of the non-hydratable Al4O4C and suppressing the formation of the hydratable Al4C3. Meanwhile, the formation of the in-situ synthesized ceramic phases such as Mg3B2O6, MgAl2O4, TiO2, and TiC enhanced the densification and strength of the refractories. Additionally, the liquid B2O3 provided the liquid-phase condition in the V-L-S growth mechanism to various carbon structures. The TSR was improved by the combined effects of these in-situ ceramic phases and carbon structures, including carbon nanospheres, carbon nanotubes, carbon films, rod-shaped and baseball-bat-shaped carbon structures. Compared with the Al additive, the TRS and HR of the refractories with the 2 wt% Al-1wt % TiB2 additive increased by 18.8 % and 42.9 %, respectively.
引用
收藏
页数:11
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