fine alpha aluminiumoxidpulver and methods for its manufacture

摘要

alpha -Alumina powder of fine particles having the primary particle diameters of from 10 nm to 100 nm, and of a high ratio of alpha -phase and further having capability to provide a sintered body with high density, and a method of manufacturing the alpha -alumina powder is provided. The method for manufacturing the alpha -alumina powder comprises a step of mixing an aluminum compound which is the precursor for the corresponding alpha -alumina and at least one selected from the group consisting of a titanium compound, an iron compound, a chromium compound, and alpha -alumina, and aluminum nitride, aluminum carbide and a aluminum boride as a seed crystal(s), and a step of calcining the mixture at a temperature of from 600 DEG C to 1000 DEG C in the presence of HCl gas in an concentration of 1% by volume to 20% by volume.