FREMGANGSMAATE FOR FREMSTILLING AV MONOKRYSTALLINSKE ALUMINIUMOKSYDKORN.

摘要

A method for producing mono-crystalline alumina grains comprising fusing alumina materials in the presence of halide to induce oxyhalide phase at grain boundaries, cooling and solidifying fused materials and separating oxyhalide phase by means of inorganic acid or alkali before or after crushing, the alumina materials being composed of aluminium oxide either alone or together with at least one of chromium, titanium, and vanadium oxides.