塩化アルミニウムの気相酸素分解によるアルミナ微粒子の生成と性質

概要

論文の詳細を見る
The formation of finely-divided alumina from AlCl_3 by the vapor phase decomposition with steam or oxygen was investigated with emphasis on the effects of its reaction conditions on the properties of the productions. The reaction apparatus and conditions are shown in Fig. 1 and Table I, respectively. The reaction products from AlCl_3 and H_2O at 700° and 900℃were amorphous and contaminated with a Cl-containing compound, presumably AlOCl. The amorphous products crystallized in k-Al_2O_3 by heating to 830℃. The products from AlCl_3 and H_2O at 1 100℃ and from AlCl_3 and O_2 at 1 00° and 1 100℃ were δ-Al_2O_3 with a small amount of k-Al_2O_3 (Table I). The electron micrographs (Fig.3) show that the reaction products are spheres with diameters smaller than 2 000Å. The particle sizes of the products prepared from AlCl_3 and H_2O are smaller and gave wider distributions than those from AlCl_3 and O_2. The particle size distributions of products from AlCl_3 and O_2 are shown in Fig 4. The distribution in Run 0-4 where AlCl_3 and O_2 were mixed at the highest temperature zone spreads toward smaller particle sizes. The wider distributions in AlCl_3-H_2O systems and in Run 0-4 are considered to have been caused by the fact that the reaction between AlCl_3 and H_2O at 1 100℃ took place rapidly before both the reactants were mixed homogeneously. The present results show that the alumina powder with narrow particle size distribution can be obtained from AlCl_3 and O_2 by mixing them at a lower temperature and subsquently heating the mixture at temperature above 1 000℃.
社団法人日本材料学会の論文
1972-06-15

塩化アルミニウムの気相酸素分解によるアルミナ微粒子の生成と性質

スポンサーリンク

概要

著者

関連論文

スポンサーリンク