Effect of additives on the oxidation resistance of aluminum-carbon submerged nozzles

Effect of additives on the oxidation resistance of aluminum-carbon submerged nozzles
1. SiC can not play the role of anti-oxidation on aluminum carbon refractory materials, Si, Al, B4C and composite additives can play a certain degree of anti-oxidation effect on aluminum carbon submerged entry nozzle, among which B4C anti-oxidation effect is the best.
2. The anti-oxidation mechanism of Si, B4C and Al powders is mainly based on their affinity for oxygen being greater than C, which is preferentially oxidized. In addition, they generate new phases during the oxidation process, change the microstructure of the material, reduce the porosity of the material, and improve the oxidation resistance of the material.
3. Both Al and Si powder form a ceramic bond with other components in the refractory material during heat treatment, so they can increase the strength of the material to a certain extent, and Si powder increases the strength of the material to a greater extent.