Radical reaction-induced Turing pattern corrosion of alumina refractory ceramics with CaO-Al2O3-SiO2-MgO slags

作者：Peng, Yuefang; Huang, Ao^*; Li, Shenghao; Chen, Xinyu; Gu, Huazhi

来源：Journal of the European Ceramic Society, 2023, 43(1): 166-172.

DOI：10.1016/j.jeurceramsoc.2022.09.044

• Alumina refractory ceramics
• Triple-phase interface
• Turing pattern corrosion
• Slag structure
• Superoxide free-radical

Quasi-volcanic corrosion occurs at the triple-phase interface of alumina refractory ceramics and MgO-containing CaO-Al2O3-SiO2 slags in the air, causing severe damage to ceramics. To address this limitation, in this study, a slag corrosion experiment is performed on alumina refractory ceramics using CaO-Al2O3-SiO2-MgO slags. Various spectroscopic techniques, including electron paramagnetic resonance spectroscopy, are used to inves-tigate the influence of slag structures with varied MgO contents on the corrosion peaks and mechanism. The results show large quantities of reactive radicals, including superoxide radicals, in the slags. Free-radical re-actions between refractory ceramics and slags lead to Turing pattern corrosion. An increase in the amount of non-bridged oxygen in the slag structure decreases the amount of original superoxide radicals. Consequently, the intensity of the free-radical reactions of alumina dissolution increases, thereby increasing the height of the corrosion peaks.