RETRACTED: Phase composition, microstructure, and properties of Al4O4C– (Al2OC)1-x(AlN)x –Zr2Al3C4–Al2O3 refractories prepared at high temperatures in nitrogen

Abstract

The novel Al 4 O 4 C–(Al 2 OC) 1- x (AlN) x –Zr 2 Al 3 C 4 –Al 2 O 3 refractories with ultra-low carbon content have been successfully prepared by constructing the core-shell structure of aluminum at 1300–1700°C in nitrogen. The phase composition, microstructure, and properties of the novel refractories are deeply investigated. The cracking temperature on the core-shell structure of aluminum is further explored and the reaction mechanism of Zr 2 Al 3 C 4 has also added explanation. The results show that the novel refractories have excellent physical properties and cannot be corroded by molten iron. There exist two different Al 2 OC solid solutions in the novel refractories, Al 2 OC-rich (Al 2 OC) 1- x (AlN) x and AlN-rich (Al 2 OC) 1- x (AlN) x . The temperatures affect their relative content. When temperatures are less than 1600°C, the relative content of Al 2 OC-rich (Al 2 OC) 1- x (AlN) x is more than that of AlN-rich (Al 2 OC) 1- x (AlN) x . When temperatures are above 1700°C, the relative content of AlN-rich (Al 2 OC) 1- x (AlN) x is more than that of Al 2 OC-rich (Al 2 OC) 1- x (AlN) x . The core-shell structure of aluminum fully ruptures at about 1200°C. Zr 2 Al 3 C 4 begins to form at about 1000°C and generates in large at 1200°C.