臭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

概要

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The preparation of finely-divided alumina by vapor phase reaction between aluminum tribromide and oxygen was investigated at 950° to 1200°C, with an emphasis on the effects of the reaction conditions on the particle size distribution of the products. The results were as follows:1) The reaction products were amorphous at 950°C and were δ- or γ-Al2O3 at 1100° and 1200°C. Products were spherical and non-porous particles with the diameter of 350 to 3000Å. The particle size decreased with the increase in temperature and with the decrease of [AlBr3]. When [AlBr3]≅4.5%, the particle size increased with the increase of [O2]. When [AlBr3]≅1%, the particle size was minimum at about [O2]=32%. By controlling these three factors, ultrafine alumina powders with a controlled particle-size distribution were prepared by the vapor phase oxygenolysis of aluminum trihalides.2) In contrast with AlCl3-O2 system, alumina powders obtained from AlBr3-O2 system. The concentration of oxygen influenced Predominantly on the bromine content which was 7-16wt% at [O2]≥32% and was less than 2.5wt% at [O2]<8%. A heat treatment above 1100°C was required to remove bromine.
社団法人日本セラミックス協会の論文
1975-01-01