Preparation method of alumina porous ceramic

Abstract

The invention relates to the field of ceramics, and provides a preparation method of aluminum oxide porous ceramics in order to solve the problem of low strength of the traditional aluminum oxide porous ceramics, which comprises the following steps: mixing aluminum oxide fine powder with water, sequentially adding a dispersing agent, a monomer, a cross-linking agent and an initiator, and carrying out ball milling for 20-30 minutes; after ball milling, aluminum oxide coarse powder, a sintering aid, a pore forming agent, a suspending agent and a defoaming agent are sequentially added and stirred, and slurry is obtained; performing ultrasonic treatment on the slurry, performing vacuum defoaming, and pouring the slurry into a forming mold for forming; and finally, demolding, drying, degreasing and sintering. The performance of the prepared alumina porous ceramic is greatly improved, the porosity is 30-50%, the bending strength is larger than or equal to 80 Mpa, and the performance requirement of the alumina porous ceramic adsorption disc for the semiconductor industry is met.

Description

technical field

[0001] The invention relates to the field of ceramics, and mainly relates to a preparation method of high-strength and high-porosity alumina porous ceramics. Background technique

[0002] Alumina porous ceramics is a kind of porous ceramic material with opening aperture and high opening porosity, which is made of alumina as the main raw material and prepared by molding and special high-temperature sintering process. It has high temperature resistance, high pressure resistance, acid resistance , alkali and organic medium corrosion, good biological inertness, controllable pore structure and high opening porosity, long service life, good product regeneration performance, etc., can be applied to precision filtration and separation of various media, high-pressure gas exhaust Gas silencing, gas distribution and electrolytic diaphragm, etc.

[0003] High porosity is beneficial to the functions of porous ceramics such as filtration, temperature insulation and sound ...

Examples

Embodiment 1

[0030] (1) Mix 25 parts of alumina fine powder with 18 parts of water, add 0.3 parts of dispersant polyacrylic acid, 1.48 parts of monomer N-methylolacrylamide, and cross-linking agent N, N'-methylenebispropylene 0.01 part of amide and 0.01 part of initiator ammonium persulfate, ball milled for 20 minutes; the average particle size of alumina fine powder is 0.8-1.0um;

[0031] (2) After ball milling, 25 parts of alumina coarse powder, 6 parts of sintering aid kaolin, 25 parts of pore-forming agent carbon powder, 0.1 part of a mass concentration of 0.1% sodium carboxymethylcellulose aqueous solution, polyether Type defoamer (GPES type) 0.1 part, add to the slurry after ball milling in step (1), stir for 20 minutes to a uniform state; the average particle size of alumina coarse powder is 3.2-3.6um;

[0032] (3) Put it into the defoaming machine, vacuum defoaming; the vacuum degree during vacuum defoaming is set to -0.1Mpa, and the defoaming time is 30 minutes; then the slurry af...

Embodiment 2

[0035] (1) Mix 20 parts of alumina fine powder with 20 parts of water, add 0.3 parts of dispersant polyacrylic acid, 1 part of monomer N-methylolacrylamide, and cross-linking agent N, N'-methylenebispropylene 0.06 part of amide and 0.06 part of initiator ammonium persulfate, ball milled for 30 minutes; the average particle size of alumina fine powder is 1.5-2um;

[0036] (2) After ball milling, successively with 20 parts of alumina coarse powder, 4 parts of sintering aid silicon micropowder and 2 parts of potassium feldspar, 30 parts of pore-forming agent polymethyl methacrylate, suspending agent is that the mass concentration is 0.5% Add 0.28 parts of carboxymethylcellulose sodium aqueous solution and 0.3 parts of polyether type defoamer (GPES type) to the slurry after ball milling in step (1), and stir for 10 minutes to a uniform state; the average particle size of alumina coarse powder is 8 -10um.

[0037] (3) Put it into the degassing machine, vacuum degassing; the vacuum...

Embodiment 3

[0040] (1) Mix 22 parts of alumina fine powder with 19 parts of water, add 0.5 parts of dispersant polyacrylic acid, 1 part of monomer N-methylol acrylamide, and cross-linking agent N, N'-methylenebispropylene 0.05 part of amide and 0.05 part of initiator ammonium persulfate, ball milled for 25 minutes; the average particle size of alumina fine powder is 1-1.5um.

[0041] (2) After ball milling, 23 parts of alumina coarse powder, 6 parts of sintering aid kaolin and 2 parts of albite, 10 parts of pore-forming agent starch and 18 parts of sawdust, and suspending agent are carboxymethyl Add 0.4 parts of cellulose sodium aqueous solution and 0.2 parts of polyether type defoamer (GPES type) to the slurry after ball milling in step (1), and stir for 15 minutes to a uniform state; the average particle size of alumina coarse powder is 6-8um.

[0042] (3) Put it into the degassing machine, vacuum degassing, the vacuum degree during vacuum degassing is set to -0.1Mpa, and the degassing ...

technical field

[0001] The invention relates to the field of ceramics, and mainly relates to a preparation method of high-strength and high-porosity alumina porous ceramics. Background technique

[0002] Alumina porous ceramics is a kind of porous ceramic material with opening aperture and high opening porosity, which is made of alumina as the main raw material and prepared by molding and special high-temperature sintering process. It has high temperature resistance, high pressure resistance, acid resistance , alkali and organic medium corrosion, good biological inertness, controllable pore structure and high opening porosity, long service life, good product regeneration performance, etc., can be applied to precision filtration and separation of various media, high-pressure gas exhaust Gas silencing, gas distribution and electrolytic diaphragm, etc.

[0003] High porosity is beneficial to the functions of porous ceramics such as filtration, temperature insulation and sound ...

Examples

Embodiment 1

[0030] (1) Mix 25 parts of alumina fine powder with 18 parts of water, add 0.3 parts of dispersant polyacrylic acid, 1.48 parts of monomer N-methylolacrylamide, and cross-linking agent N, N'-methylenebispropylene 0.01 part of amide and 0.01 part of initiator ammonium persulfate, ball milled for 20 minutes; the average particle size of alumina fine powder is 0.8-1.0um;

[0031] (2) After ball milling, 25 parts of alumina coarse powder, 6 parts of sintering aid kaolin, 25 parts of pore-forming agent carbon powder, 0.1 part of a mass concentration of 0.1% sodium carboxymethylcellulose aqueous solution, polyether Type defoamer (GPES type) 0.1 part, add to the slurry after ball milling in step (1), stir for 20 minutes to a uniform state; the average particle size of alumina coarse powder is 3.2-3.6um;

[0032] (3) Put it into the defoaming machine, vacuum defoaming; the vacuum degree during vacuum defoaming is set to -0.1Mpa, and the defoaming time is 30 minutes; then the slurry af...

Embodiment 2

[0035] (1) Mix 20 parts of alumina fine powder with 20 parts of water, add 0.3 parts of dispersant polyacrylic acid, 1 part of monomer N-methylolacrylamide, and cross-linking agent N, N'-methylenebispropylene 0.06 part of amide and 0.06 part of initiator ammonium persulfate, ball milled for 30 minutes; the average particle size of alumina fine powder is 1.5-2um;

[0036] (2) After ball milling, successively with 20 parts of alumina coarse powder, 4 parts of sintering aid silicon micropowder and 2 parts of potassium feldspar, 30 parts of pore-forming agent polymethyl methacrylate, suspending agent is that the mass concentration is 0.5% Add 0.28 parts of carboxymethylcellulose sodium aqueous solution and 0.3 parts of polyether type defoamer (GPES type) to the slurry after ball milling in step (1), and stir for 10 minutes to a uniform state; the average particle size of alumina coarse powder is 8 -10um.

[0037] (3) Put it into the degassing machine, vacuum degassing; the vacuum...

Embodiment 3

[0040] (1) Mix 22 parts of alumina fine powder with 19 parts of water, add 0.5 parts of dispersant polyacrylic acid, 1 part of monomer N-methylol acrylamide, and cross-linking agent N, N'-methylenebispropylene 0.05 part of amide and 0.05 part of initiator ammonium persulfate, ball milled for 25 minutes; the average particle size of alumina fine powder is 1-1.5um.

[0041] (2) After ball milling, 23 parts of alumina coarse powder, 6 parts of sintering aid kaolin and 2 parts of albite, 10 parts of pore-forming agent starch and 18 parts of sawdust, and suspending agent are carboxymethyl Add 0.4 parts of cellulose sodium aqueous solution and 0.2 parts of polyether type defoamer (GPES type) to the slurry after ball milling in step (1), and stir for 15 minutes to a uniform state; the average particle size of alumina coarse powder is 6-8um.

[0042] (3) Put it into the degassing machine, vacuum degassing, the vacuum degree during vacuum degassing is set to -0.1Mpa, and the degassing ...

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