▎ 摘　　要

NOVELTY - Preparing superfine crystal grain alpha -phase alumina ceramic is prepared by using graphene oxide as template to prepare amorphous aluminum hydroxide, heating amorphous aluminum hydroxide at 1100 degrees C in air to obtain sheet alpha -phase alumina, and sintering to obtain alpha -phase alumina ceramic. USE - The method is useful for preparing superfine-grained alpha-phase alumina ceramic with high strength and high hardness. ADVANTAGE - The crystal alpha-phase alumina ceramic with high strength and high hardness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for superfine crystal grain alpha-phase alumina ceramic prepared by above mentioned method.