Abstract
A α-alumina fine powder was coated by SiO2 ultra-fine particles with a diameter of nano-meters. SiO2 by hydrolysis of ethyl silicate with water adsorbed on the powder was precipitated onto the powder in the hydrophobic liquid which contained 90 vol.% ligroin, 10 vol.% ethyl silicate and 0.015 mol/l stearic acid. The thickness of the coated layer was controllable by changing the amount of the adsorbed water up to 10 wt.% of the powder.
† This report was originally printed in J. Soc. Powder Technology, Japan. 27(3), 170-173 (1990) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
