Mullite porous ceramic and preparation method thereof

Abstract

The invention relates to mullite porous ceramic and a preparation method thereof. The invention adopts the technical scheme that the preparation method comprises the following steps: soaking a stabilizer in deionized water for 12-24 hours according to the mass ratio of the stabilizer to the deionized water being (0.001-0.006):1 and stirring to prepare a solution; adding a dispersing agent and mullite powder into the solution according to the mass ratio of the dispersing agent to the mullite powder to the deionized water being (0.003-0.03): (2-3.6):1, stirring for 10-30 minutes and preparing mullite slurry; adding a foaming agent into the mullite slurry according to the volume ratio of the foaming agent to the mullite slurry being (0.00025-0.012):1, stirring and preparing foam slurry; injecting the foam slurry into a mold, carrying out in-situ solidification for 3-12 hours at a temperature of 10-70 DEG C, demolding, drying and then calcining for 1-6 hours at a temperature of 1450-1650 DEG C and preparing the mullite porous ceramic. The mullite porous ceramic and the preparation method thereof have the benefits that the preparation process is simple, the process is easy to control, and in the preparation process, the pollution is less, and the production cost is low; the mullite porous ceramic has high product strength, small aperture and wide industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics. It specifically relates to a mullite porous ceramic and a preparation method thereof. Background technique [0002] Porous ceramics is an inorganic non-metallic material with many pores. It has excellent characteristics such as high porosity, high permeability, large specific surface area, low bulk density and low thermal conductivity. It is widely used in chemical industry, metallurgy, energy and Thermal engineering and other fields. [0003] Gel injection molding is one of the most commonly used processes for preparing porous ceramics. This process uses simple equipment to prepare porous ceramics with complex shapes. "Method for Preparing Porous Ceramic Composite Materials by Protein Foaming" (CN101967064A) Using egg white as foaming agent and polysaccharide as gelling agent, mullite, silica, and alumina were prepared by gel injection molding Porous ceramics, the ceramic body prepar...

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Problems solved by technology

"Method for Preparing Porous Ceramic Composite Materials by Protein Foaming" (CN101967064A) Using egg white as foaming agent and polysaccharide as gelling agent, mullite, silica, and alumina were prepared by gel injection molding Porous ceramics, the ceramic body prepared by this method needs to be solidified and formed under the environment of 75~85°C, and the amount of organic matter is relatively large. Although the foaming agent and gelling agent used are non-toxic, a large amount of The burning of organic matter seriously pollutes the environment

"A tert-butanol-based gel injection molding method to prepare Si 3 N 4 Forming method of porous ceramics" (CN102344297 A) using tert-butanol as solvent, acrylamide as monomer, nitrogen-nitrogen methylenebisacrylamide as crosslinking agent, prepared silicon nitride porous ceramics with high porosity and high strength , this method has the following disadvantages: ① the amount of organic matter is large, the content of organic matter in the waste liquid generated during the preparation process is high, and the toxicity of organic matter is relatively large, such as solvent tert-butanol, monomer acrylamide and crosslinking agent nitrogen - Nitromethylenebisacrylamide is irritating to the eyes, skin, mucous membranes and respiratory tract, and will endanger the health of operators; at the same time, the combustion of organic matter in the sintering process produces a large amount of waste gas, which seriously pollutes the environment

②This method needs to be molded in a water bath at 30-65°C after injection molding, which is inconvenient to operate

③This method consumes a large amount of organic matter, and the cost is high, so it is not suitable for large-scale production

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