Alumina grain, preparation method therefor and use thereof

Abstract

A preparation method of an alumina powder includes the following steps: subjecting the raw material powder having a particle size not exceeding 1,000 mesh to a shear treatment in the presence of a solvent and a polymerization inhibitor to obtain a stable suspension; mixing the suspension with a crystal plane growth guiding agent uniformly and subjecting the mixture to a hydrothermal treatment under a hermetic conditions, then performing a solid-liquid separation, and subjecting the solid to drying and roasting. The alumina powder contains alumina grains having a single-crystal structure and bas an approximate regular octahedral stereoscopic morphology. Eight sides of the alumina grain belong to the {111} family of crystal planes of γ-state alumina, and the grain size is 5-100 μm.

Dependencies are inferred from the claim text.