Method for fabricating porous ceramic heating body

A method for fabricating a porous ceramic heating body, the method comprising:

• A) mixing, by taking diatomaceous earth accounting for 15-45%, pore-forming agent accounting for 5-19%, nano-silica solution accounting for 0-2%, deionized water accounting for 20-40%, resistive slurry accounting for 20-35%, and organic solvent accounting for 10-25% according to weight percentage, and then evenly mixing and stirring to obtain porous ceramic substrate slurry;
• B) ball-milling, by adding grinding balls to the porous ceramic substrate slurry obtained in step A), and putting them into a ball-milling tank to conduct wet ball milling for a period of 4-24 hours;
• C) defoaming the porous ceramic substrate slurry after wet ball milling in step B) under a vacuum condition;
• D) molding and drying, by casting the porous ceramic substrate slurry obtained in step C) by a casting machine to obtain a ceramic substrate with a desired shape, and drying the ceramic substrate to form a green body;
• E) discharging of pore-forming agent, by placing the green body obtained in step D) into a graphite crucible and burying it into isolating powders, and then discharging the pore-forming agent of the green body buried in the isolating powders using a box furnace under normal pressure, wherein the furnace atmosphere is oxygen;
• F) sintering, by placing the green body obtained in step E) into a graphite crucible and burying it into isolating powders, and then sintering the green body buried in the isolating powders using a box furnace under normal pressure, wherein the sintering atmosphere is oxygen, and wherein the green body is sintered to obtain a semi-finished product of porous ceramic heating body;
• and
• G) electrode leading, by performing a nickel plating process onto two ends of the semi-finished product of porous ceramic heating body obtained in step F), and then performing brazing at a position proceeded with the nickel plating process to lead out electrode to obtain a finished product of porous ceramic heating body.