Dong Bo, Yu Chao, Xing Guangchao, Di Jinghui, Ding Jun, Zhu Qingyou, Zhu Hongxi, Deng Chengji
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
Materials (Basel). 2023 Feb 24;16(5):1892. doi: 10.3390/ma16051892.
The in situ Mg-sialon in low-carbon MgO-C refractories was studied with respect to its oxidation behavior and mechanism at 1500 °C. The results indicated that the oxidation index and rate constant of low-carbon MgO-C refractories with Mg-sialon were 26.2% and 0.51 × 10 cm/min at 1500 °C for 2 h, respectively. The formation of a dense MgO-MgSiO-MgAlO protective layer contributed to considerable oxidation resistance, and the generation of this thicker layer was due to the combined volume effect of MgSiO and MgAlO. The reduced porosity and more complex pore structure were also found in the refractories with Mg-sialon. Therefore, further oxidation was restricted as the oxygen diffusion path was effectively blocked. This work proves the potential application of Mg-sialon in improving the oxidation resistance of low-carbon MgO-C refractories.
针对低碳MgO-C耐火材料中的原位Mg-赛隆，研究了其在1500℃下的氧化行为及机理。结果表明，含Mg-赛隆的低碳MgO-C耐火材料在1500℃下2小时的氧化指数和速率常数分别为26.2%和0.51×10⁻⁶cm/min。致密的MgO-MgSiO-MgAlO保护层的形成有助于显著提高抗氧化性，而这一较厚层的产生是由于MgSiO和MgAlO的综合体积效应。在含Mg-赛隆的耐火材料中还发现孔隙率降低且孔隙结构更为复杂。因此，由于氧扩散路径被有效阻断，进一步的氧化受到限制。这项工作证明了Mg-赛隆在提高低碳MgO-C耐火材料抗氧化性方面的潜在应用。
