Preparation method of hercynite powder with sheet structure

The invention relates to a preparation method of hercynite powder with a sheet structure, which belongs to the technical field of inorganic nonmetal powder raw material preparation process and morphology control, and is characterized in that raw materials comprise sheet alpha-Al2O3 as an aluminum source, Fe2O3 and Fe3O4 as an iron source, NaCl and/or KCl as chlorine-based molten salt and C as a reducing agent. The molar ratio of the aluminum source to the iron source is FeO: Al2O3 = 1: 1, the molar ratio of Fe2O3 to C is 2: 1.05-1, and the mass ratio of the chlorine-based molten salt to the total mass of the iron source, the aluminum source and the reducing agent is 3: 1-3; all the raw materials are uniformly mixed, dried, sintered and washed to obtain the sheet hercynite powder. The preparation method disclosed by the invention is simple and feasible in process, high in synthesis purity and sheet-shaped in morphology, and can be used in the field of composite materials for enhancing the composite materials a