Nanoporous ceramic for atomization core and preparation method thereof

A preparation method of a nanoporous ceramic for an atomization core, comprising the following steps:

• (1) weighing raw materials including 5 to 40 parts of nano-silica, 20 to 70 parts of a ceramic powder, 5 to 30 parts of a pore-forming agent, and 1 to 20 parts of a sintering additive, and mixing and ball-milling the raw materials in a ball mill, wherein the nano-silica comprises colloidal nano-silica or powdery nano-silica, nanoparticles of the nano-silica have a primary particle size of 10 nm to 150 nm, and an amount of the colloidal nano-silica is calculated based on solid silica in the colloidal nano-silica;
• the ceramic powder comprises at least one selected from the group consisting of kaolin, diatomaceous earth, aluminum oxide, silicon nitride, silicon carbide, quartz sand, glass sand, clay, and a feldspar powder;
• and the sintering additive comprises at least one selected from the group consisting of boron oxide, boric acid, oleic acid, stearic acid, sodium silicate, calcium oxide, iron oxide, and titanium oxide;
• (2) oven-drying the ball-milled raw materials obtained in step (1) to obtain a dried mixed powder;
• (3) heating paraffin to molten paraffin, adding the dried mixed powder to the molten paraffin under stirring, and continuously stirring a resulting mixture for 1 hour to 8 hours to obtain a paraffin slurry;
• (4) injecting the paraffin slurry into a mold prepared in advance, cooling the mold for forming, and performing demolding to obtain a paraffin mold;
• (5) preheating the paraffin mold for paraffin removal to obtain a paraffin-removed sample;
• and
• (6) sintering the paraffin-removed sample to obtain the nanoporous ceramic, wherein the sintering comprises heating, temperature-holding, and cooling.