Method and device for preparing porous ceramic by heavy gas-protective direct-foaming technology

A technology of porous ceramics and foaming devices, applied in ceramic products, applications, household appliances, etc., can solve the problems of difficult polymerization of ceramic slurry, long production experiment cycle, hindering polymerization reaction, etc., and achieve fast gelation speed and stable foam , easy-to-operate effect

Active Publication Date: 2015-03-11
AVIC COMPOSITES
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Problems solved by technology

However, as a free radical polymerization reaction, since the monomer is in contact with the air during polymerization, the oxygen in the air will hinder the polymerization reaction, so the ceramic slurry is difficult to polymerize in the air bubbles.
In order to overcome the problem that surface oxygen hinders the polymerization reaction, there is a patent to prepare porous ceramics by using nitrogen protection free radical polymerization foaming method. This method requires heating and curing (60-150°C) during the gelation process, and the gelation process takes a long time, resulting in a production experiment cycle. Long, high equipment requirements

Method used

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  • Method and device for preparing porous ceramic by heavy gas-protective direct-foaming technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Weigh 500g of alumina ceramic powder with an average particle size of 0.5μm, add 80ml of deionized water, 10ml of ammonium acrylate dispersant, 10ml of ammonia water (10%), 1g of basic magnesium carbonate powder, and 12g of acrylamide organic monomer , 0.8g methylenebisacrylamide; put the above mixture into a roller mill for 15 hours; Activator 0.5g, put into special foaming equipment, and keep the Ar gas flow rate 500ml / min; after 2min, adjust the rotor speed of the mixer to 1000r / min, and foam the slurry to 500ml; drop in ammonium persulfate aqueous solution (10%) 1.5 g, 1.5 g of tetramethyl-ethylenediammonium (50%) aqueous solution; inject the above-mentioned foamed ceramic slurry into a glass mold; after 1 hour, demould the porous ceramic body and place it on a transparent sieve to dry freely for 10 days ; The dried body is calcined at 1600°C for 2 hours in an air furnace to obtain alumina foam ceramics with a porosity of 65%.

Embodiment 2

[0026] Weigh 500g of silicon nitride ceramic powder with an average particle size of 0.5 μm, 7g of alumina ceramic powder, 7g of yttrium oxide powder, measure 150ml of deionized water, 15ml of ammonium acrylate dispersant, 15ml of ammonia water (10%), 20g Acrylamide organic monomer, 1g methylene bisacrylamide; put the above mixture into a ball mill jar and mill for 15 hours; measure 100ml of ceramic suspension slurry; the slurry is degassed by vacuum stirring until no bubbles overflow, add surface active 0.5g; put the slurry into special foaming equipment, feed Ar gas at 500ml / min for 2min, adjust the mixer speed to 1000r / min, foam the slurry to 500ml, drop in 2ml of ammonium persulfate aqueous solution (10%), Tetramethyl ethylenediammonium (50%) aqueous solution 3ml; The above-mentioned slurry is injected in the glass mould; After 1h, the green body is taken out from the mould, placed on the upper and lower transparent screens and dried for 10 days; The silicon nitride green ...

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Abstract

The invention belongs to the field of inorganic non-metallic materials and relates to a method and device for preparing porous ceramic by a heavy gas-protective direct-foaming technology. The method comprises preparing suspension slurry, carrying out vacuum bubble-removal, removing environment air by heavy gas, carrying out heavy gas-protective stirring foaming, carrying out pouring, carrying out demolding, carrying out drying and carrying out sintering. The foamed ceramic is prepared by heavy gas (such as argon or carbon dioxide)-protective stirring foaming and the water-based ceramic slurry foaming special-purpose device is designed. The method for preparing the foamed ceramic adopts a stirring foaming method adopting heavy gas to extrude air upward, utilizes simple equipment and is convenient for operation. The foamed ceramic slurry undergoes a free radical polymerization reaction for gelation curing, has a fast gelation rate, has uniform blank aperture distribution and is suitable for preparation of a porous ceramic material with apertures of 50-300 microns.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a method and a device for preparing porous ceramics by a heavy gas protection direct foaming method. Background technique [0002] In the early 1990s, the Oak Ridge State Key Laboratory of the United States invented the gel injection molding technology of the ceramic body. This technology combines the traditional organic body grouting molding technology with the theory of polymer chemistry. The organic monomers and crosslinking agents that form the gel are prepared with organic solvents or water to form a premixed solution, mixed with ceramic powder to prepare a ceramic slurry, poured into a non-permeable mold and made in situ under certain conditions Polymerize to form a gel body with a cross-bond structure to shape the ceramic body, which is suitable for the precision molding of various complex shapes of ceramic bodies. However, as a free radical polymerization re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/10C04B35/584C04B35/622
Inventor 李宝伟焦建焦春荣王岭梁艳媛张冰玉
Owner AVIC COMPOSITES
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