アルミナ系複合酸化物コーティング黒鉛粉末の耐酸化性

概要

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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 Al_2O_3-based oxides. The coating effect with Al_2O_3-based oxides on oxidation resistance of the graphite powders were studied. The oxidation resistance of the graphite powders coated with Al_2O_3-ZrO_2, Al_2O_3-TiO_2, Al_2O_3-B_2O_3 and Al_2O_3-SiO_2 was higher than that of the graphite powder coated with Al_2O_3 monoxide, and the graphite powders coated with 90Al_2O_3・10SiO_2(mass%)showed the highest oxidation resistance. The coating layer of 90Al_2O_3・10SiO_2(mass%)showed the lower true density, higher specific surface area and lower linear shrinkage than those of Al_2O_3. It is considered that these properties of 90Al_2O_3・10SiO_2(mass%)coated graphite determined the high oxidation resistance of the graphite powders.
社団法人日本セラミックス協会の論文
1999-09-01