Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Bo Dong; Chao Yu; Guangchao Xing; Jinghui Di; Jun Ding; Qingyou Zhu; Hongxi Zhu; Chengji Deng

doi:10.3390/ma16051892

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Materials (Basel). 2023 Feb 24;16(5):1892. doi: 10.3390/ma16051892.

Authors

Bo Dong¹, Chao Yu¹, Guangchao Xing¹, Jinghui Di¹, Jun Ding¹, Qingyou Zhu¹, Hongxi Zhu¹, Chengji Deng¹

Affiliation

¹ The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.

Abstract

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^-3 cm²/min at 1500 °C for 2 h, respectively. The formation of a dense MgO-Mg₂SiO₄-MgAl₂O₄ protective layer contributed to considerable oxidation resistance, and the generation of this thicker layer was due to the combined volume effect of Mg₂SiO₄ and MgAl₂O₄. 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.

Keywords: Mg-sialon; MgO-C refractories; low-carbon; oxidation.

Abstract

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