Preparation method of flexible alumina-based ceramic fiber thick film

The invention discloses a preparation method of a flexible alumina-based ceramic fiber thick film. The preparation method comprises the following specific steps: mixing metal aluminum powder, aluminum salt and water according to a certain proportion, heating, stirring and dissolving to obtain a mixed solution; adding an acidic protective solution into the mixed solution to enable the mixed solution to be acidic, and then adding water-soluble inorganic silica sol to obtain a precursor solution; carrying out dehydration condensation on the precursor solution under a constant-temperature heating condition to obtain precursor sol; respectively adding a ceramic additive and a spinning aid into the precursor sol, respectively adjusting the colloid viscosity in the process stages of preparing the precursor sol and spinning sol, and then carrying out electrostatic spinning to obtain an alumina-based ceramic fiber membrane precursor; and finally sintering to obtain the flexible alumina-based ceramic ...