ABSTRACT

Effect of MgO content on wetting and corrosion behaviour of corundum substrate by CaO–SiO₂–MgO (−15%Al₂O₃) molten slags was investigated at 1450°C via joint application of a sessile drop technique, SEM–EDS detection and FactSage thermodynamic software. All slags exhibit good wettability on the substrate, and the contact angle values are small. Increasing MgO content from 7% to 9% in CaO-SiO₂-MgO slags can increase the contact angle between the droplet and the substrate, while the substrate dissolution thickness and the slag penetration depth tend to decrease. Increasing MgO content from 8% to 15% in CaO-SiO₂-MgO-15% Al₂O₃ slags can also increase the contact angle, but significantly decrease the slag penetration depth. The indirect dissolution thickness increases instead due to the formation of a large amount of MgAl₂O₄ by the interface reaction. The wettability can give an indication of the slag penetration depth in the substrate but not the dissolution thickness of the substrate.

摘要

通过坐滴技术、SEM-EDS 检测和联合应用，在 1450°C 下研究了MgO 含量对 CaO-SiO ₂ -MgO (-15%Al ₂ O ₃ ) 熔渣对刚玉基体润湿和腐蚀行为的影响。 FactSage 热力学软件。所有炉渣对基材均表现出良好的润湿性，接触角值较小。_{当CaO-SiO 2} -MgO渣中MgO含量从7%增加到9%时，液滴与基体的接触角增大，而基体溶解厚度和熔渣渗透深度趋于减小。CaO-SiO ₂ -MgO-15% Al ₂ O _{3中MgO含量从8%提高到15%}炉渣还可以增加接触角，但会显着降低炉渣的渗透深度。由于界面反应形成大量MgAl ₂ O _{4 ，间接溶解厚度反而增加。}润湿性可以指示炉渣在基底中的渗透深度，但不能指示基底的溶解厚度。