Study on reaction interface of carbon‐free oxide‐based refractories with lanthanum oxide and lanthanum aluminate

In this study, the reaction interfaces of four kinds of oxide refractories (corundum, spinel, mullite, and zirconia) with lanthanum oxide (La 2 O 3 ) and lanthanum aluminate (LaAlO 3 ) under different atmospheres at high temperatures (1550°C) were analyzed. The results show that the four oxides have a strong reaction with La 2 O 3 , and the corresponding rare earth aluminate, rare earth silicate, and rare earth zirconate are formed respectively. The reaction with LaAlO 3 is weak, and almost no reaction occurs. Mullite has poor structural stability in a high‐temperature reduction atmosphere, easy decomposition, and strong reaction with La 2 O 3 . This study provides an important reference for the study of the reaction mechanism between rare earth steel and lining materials and the research and development of special lining materials for rare earth steel.