Preparation method of porous ceramic with controllable aperture and porosity

The invention discloses a preparation method of porous ceramic with controllable aperture and porosity, and relates to the technical field of aluminum oxide ceramic. According to the preparation method, the ceramic raw materials are subjected to mechanical grinding twice, so that a uniform and refined matrix structure can be formed in the subsequent sintering process, and the strength of the ceramic is improved; according to the invention, borax and basic magnesium carbonate are used as sintering aids, the ceramic is fully sintered, whiskers are formed in the ceramic, the internal strength of the ceramic is enhanced, the basic magnesium carbonate and asphalt in the ceramic raw materials act together, certain initial pores are formed in the ceramic, and then the aerogel fibers and other raw materials are added, so that the strength of the ceramic is improved. And carrying out third wet grinding and spray granulation, then carrying out gradient heating sintering treatment, and forming a micro-skeleton by virtue