Abstract
Ethyl acetoacetate aluminium diisopropoxide, magnesium acetate tetrahydrate, titanium tetraisopropoxide, zirconium tetra-n-butoxide, tetraethyl orthosilicate and boric acid were used to prepare graphite powders coated with Al2O3-based oxides. The coating effect with Al2O3-based oxides on oxidation resistance of the graphite powders were studied. The oxidation resistance of the graphite powders coated with Al2O3-ZrO2, Al2O3-TiO2, Al2O3-B2O3 and Al2O3-SiO2 was higher than that of the graphite powder coated with Al2O3 monoxide, and the graphite powders coated with 90Al2O3⋅10SiO2 (mass%) showed the highest oxidation resistance. The coating layer of 90Al2O3⋅10SiO2 (mass%) showed the lower true density, higher specific surface area and lower linear shrinkage than those of Al2O3. It is considered that these properties of 90Al2O3⋅10SiO2 (mass%) coated graphite determined the high oxidation resistance of the graphite powders.
