Effect of A1_2O_3 Coating on Wettability and Oxidation Resistance of Graphite

摘要

In this research, the graphite powders were coated with A1_2O_3 by hydrolysis of an Aluminum nitrate aqueous solution. The surface of the graphite particles coated with Al_2O_3 was investigated by XRD and the quality of Al_2O_3 coating on the surface of graphite was observed by SEM and was investigated by EDS. For detail investigation on the surface of coated graphite TEM was used and then wettability and oxidation resistance were investigated. To compare the effect of coating and antioxidant on oxidation resistance of graphite, Al and SiC were used as antioxidant. The results showed that the surface of graphite flakes was successfully coated and modified so that wettability and oxidation resistance of graphite greatly improved and the amount of antioxidant needed for application of graphite in the refractory decreased.