Preparation method for large-size high-purity aluminum oxide ceramic material

A technology of high-purity alumina and alumina ceramics, which is applied in the field of alumina ceramic material production, can solve the problems of semi-finished product deformation, acrylamide system cannot be mass-produced industrially, etc., and achieves low production cost, small deformation and shrinkage, and simple and easy method line effect

Active Publication Date: 2013-10-09
杭州大和江东新材料科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the acrylamide system used in the preparation of high-purity alumina ceramic materials by the traditional gel-casting gel-casting process cannot be mass-produced due to neurotoxicity, and to provide a large-scale high-purity alumina ceramic The preparation method of the material is simple and easy, the production cost is low, and it is suitable for industrialized large-scale production. The semi-finished product after demoulding is dried, and the deformation and shrinkage after sintering are small, and the obtained large-scale high-purity alumina ceramic material is of good quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046](1) Preparation of water-based gel system premix: Stir and mix 15 kg of dimethylacrylamide, 0.2 kg of N,N'-methylenebisacrylamide, 0.1 kg of ammonium persulfate and 100 kg of distilled water to form a water-based gel The glue system premix is ​​ready for use.

[0047] (2) Preparation of alumina ceramic slurry: 150 kg of modified high-purity alumina powder, 100 kg of water-based gel system premix solution and 3 kg of slurry fluidity modifier were mixed with a ball mill at high speed for 1 hour to obtain a solid Alumina ceramic slurry with a phase content of about 60% and a viscosity of about 200mPa.s; modified high-purity alumina powder is prepared by the following method: Submicron α-Al 2 o 3 100kg, 0.5kg of organic acid salt solution and 70kg of distilled water were mixed and ball-milled for 3 hours to make a slurry, and the slurry was dried at 80°C for 10 hours to obtain modified high-purity alumina powder. The organic acid salt solution is prepared by reacting palm...

Embodiment 2

[0081] (1) Preparation of water-based gel system premix: Stir and mix 20 kg of dimethylacrylamide, 0.3 kg of N,N'-methylenebisacrylamide, 0.2 kg of ammonium persulfate and 100 kg of distilled water to form a water-based gel The glue system premix is ​​ready for use.

[0082] (2) Preparation of alumina ceramic slurry: 400 kg of modified high-purity alumina powder, 100 kg of water-based gel system premix solution and 5 kg of slurry flow performance modifier were mixed with a ball mill for 2 hours at high speed to prepare Alumina ceramic slurry with a solid phase content of about 85% and a viscosity of about 250mPa.s; modified high-purity alumina powder is prepared by the following method: Submicron α-Al 2 o 3 100kg, 1.5kg of organic acid salt solution and 80kg of distilled water were mixed and ball milled for 4 hours to make a slurry, and the slurry was dried at 125°C for 5 hours to obtain modified high-purity alumina powder. The organic acid salt solution is made by reacting...

Embodiment 3

[0116] (1) Preparation of water-based gel system premix: Stir and mix 17 kg of dimethylacrylamide, 0.25 kg of N,N'-methylenebisacrylamide, 0.15 kg of ammonium persulfate and 100 kg of distilled water to form a water-based gel The glue system premix is ​​ready for use.

[0117](2) Preparation of alumina ceramic slurry: 300 kg of modified high-purity alumina powder, 100 kg of water-based gel system premix solution and 4 kg of slurry flow performance modifier were mixed with a ball mill for 1.5 hours at high speed to prepare Alumina ceramic slurry with a solid phase content of about 80% and a viscosity of about 220mPa.s; modified high-purity alumina powder is prepared by the following method: Submicron α-Al 2 o 3 100kg, 1kg of organic acid salt solution and 75kg of distilled water were mixed and ball-milled for 3.5 hours to make a slurry, and the slurry was dried at 100°C for 7 hours to obtain modified high-purity alumina powder. The organic acid salt solution is prepared by r...

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Abstract

The invention discloses a preparation method for a large-size high-purity aluminum oxide ceramic material and aims to solve the problems that an acrylamide system is used for preparing the high-purity aluminum oxide ceramic material, and the high-purity aluminum oxide ceramic materials cannot be industrially produced on large scale due to neurotoxicity in the conventional gel-casting process. The method comprises the following steps of: preparing a premixed solution of a water-based gel system; preparing the aluminum oxide ceramic material; defoaming; performing injection molding; drying; degreasing; sintering and the like. The preparation method is simple and practicable, low in production cost and suitable for industrial large-scale production; a semi-finished product obtained after demolding is slightly deformed and retracted after being dried and sintered; and the obtained large-size high-purity aluminum oxide ceramic material is high in quality.

Description

technical field [0001] The invention relates to the technical field of production of alumina ceramic materials, in particular to a preparation method of large-scale high-purity alumina ceramic materials. Background technique [0002] The traditional gel injection molding process prepares high-purity alumina ceramic materials. The basic principle is that the monomer acrylamide (AM) and the crosslinking agent are N, N'-methylenebisacrylamide (MBAM) according to a certain ratio. , add initiator and catalyst (antioxidant) to make a premixed solution, then introduce powder and dispersant, make a slurry with a certain concentration after ball milling and dispersion, and inject it into the mold at a certain temperature after stirring and vacuum degassing The curing reaction is carried out under the environment, and it can be dried and sintered after demoulding. This molding process cannot realize industrialized production for the mass production of large-scale high-purity alumina ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/632
Inventor 马玉琦顾永明姚相民
Owner 杭州大和江东新材料科技有限公司
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