Porous ceramic and preparation method thereof

The invention discloses porous ceramic and a preparation method thereof, and belongs to the technical field of functional ceramic materials. According to the invention, a film with a breathable structure is used as an inner pad of upper and lower pressure heads of the porous ceramic forming die; the preparation method comprises the following steps: putting mixed and granulated powder into a mold cavity of a forming mold, uniformly spreading, jolt-ramming and strickling, clamping films on two sides of the granulated powder, pressing into a formed ceramic wet blank with a certain shape and thickness, then putting the formed ceramic wet blank on a breathable tray with the planeness lower than 0.1 mm, and performing microwave and hot air circulation drying and high-temperature sintering to obtain the ceramic. The large-size and thin-wall porous ceramic is prepared. By adopting the film prepared by the invention, the problems of mold sticking, microcracks and the like of a porous ceramic molded blank are effective