Preparation and ladle slag resistance mechanism of MgAlON bonded Al2O3 -MgAlON-Zr2Al3C4-(Al2CO)1-x(AlN)x refractories

Abstract MgAlON bonded Al 2 O 3 -MgAlON-Zr 2 Al 3 C 4 -(Al 2 CO) 1- x (AlN) x refractories were prepared at high temperatures from 1300 ℃ to 1600 ℃ in N 2 -flowing based on the design of Al-AlN core-shell. The refractory prepared at 1500 ℃ was chosen to conduct the ladle slag resistance test at 1600 ℃ in air. All the refractories are composed of MgAlON, Zr 2 Al 3 C 4 , (Al 2 CO) 1- x (AlN) x and Al 2 O 3 . The ladle slag resistance test for the chosen refractory presents a good result and there exist two different reaction layers —— the reacted slag layer and the spinel solid solution layer. The reacted slag layer consists of spinel solid solution, Ca-ZrO 2 and gehlenite/gehlenite solution, where the formation of those phases has changed the chemical composition and phase composition of the original ladle slag. The compact spinel solid solution layer forms by the decomposition of MgAlON into rich-Al 2 O 3 spinel and the incorporation of Mn 2+ and Fe 2+/3+ into rich-Al 2 O 3 spinel, which plays an important role in slag penetration resistance.