Wetting Behavior of High Alumina Slags on the Fused Magnesia under Different Atmospheres and Low Static Magnetic Field

With the growing demand for high‐aluminum steel, there is an urgent need to enhance the slag resistance of magnesia‐based refractories. The wettability of high‐alumina slag on magnesia‐based refractories serves as a crucial indicator of the refractory's slag resistance. In this study, the influence of atmosphere and magnetic flux density on the wetting behavior between the slags with different basicity (CaO wt%/SiO 2 wt%) and fused magnesia is explored using a high‐temperature visualization device with a controllable static magnetic field. Compared to air and argon atmospheres, the apparent contact angle of the slag on the fused magnesia decreases significantly in a vacuum environment as the violent interfacial radical reaction. The static magnetic field of 0.5 mT can regulate the spin state of a single electron in the free radical pair, resulting in an increase of the apparent contact angle by 21.1% in a vacuum atmosphere. It provides new thoughts on the development of external field protection technology for the corrosion resistance of magnesia‐based refractories.