Preparation method of porous calcium hexaluminate ceramic with uniform structure

The invention discloses a preparation method of porous calcium hexaluminate ceramic with a uniform structure, which comprises the following steps: CaCO3 powder and boehmite AlOOH powder are taken, the mass ratio of the CaCO3 powder to the boehmite AlOOH powder is 1: 7.2, and the particle size of the boehmite AlOOH powder is 0.1-1 [mu] m; caCO3 powder and boehmite AlOOH powder are mixed to obtain mixed powder, the mixed powder is subjected to wet ball milling in a ZrO2 ball milling medium and an ethanol solution for 12-24 h to obtain slurry, and the mass ratio of the mixed powder to the ZrO2 ball milling medium to the ethanol solution is 1: (1-2): (2-4); the slurry obtained after ball milling is dried for 10 h to 20 h at the temperature ranging from 80 DEG C to 100 DEG C; sieving the dried mixed powder with a 80-100-mesh sieve to obtain sieved powder, performing dry pressing on the sieved powder, calcining in a high-temperature furnace, cooling to room temperature along with the furnace after calcining, and ta