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Method for promoting healing of crackles in gelatin casting molding biscuit

A technology of pouring molding and gelling, which is applied in the direction of ceramic molding machines, manufacturing tools, etc., to achieve the effect of easy realization, easy access, uniform and complete structure

Active Publication Date: 2009-08-26
中国科学院上海硅酸盐研究所苏州研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And about the scheme of healing the cracks in the gel-cast biscuit by controlling the curing and drying process, there is no report at home and abroad at present

Method used

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  • Method for promoting healing of crackles in gelatin casting molding biscuit

Examples

Experimental program
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Effect test

Embodiment 1

[0014] The monomer acrylamide was dissolved in deionized water to make a 15wt% solution, and the cross-linking agent N,N'-methylenebisacrylamide (MBAM) was added. The ratio of crosslinking agent to monomer is 1:6. The dispersant tetramethylammonium hydroxide (TMAH) was then added to prepare a premix. Add silicon carbide powder and ball mill to obtain a slurry with a solid content of about 50vol%, and the viscosity of the slurry is about 300-600mPa.s. Add the initiator azo[2-(2-imidazolin-2-yl)]propane hydrochloride (AZIP·2HCl)), wherein the addition amount of the initiator is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Curing in the temperature range of 40-60 ℃ for 30-60min. Take it out and get a wet biscuit after demoulding. Then put the wet biscuit in a constant temperature and humidity oven, and dry it for 24-96 hours at 50-75°C and a relative humidity of 80-95%, and finally use a multi-step drying method to obta...

Embodiment 2

[0016]The monomer methacrylamide was dissolved in deionized water to make a 15wt% solution, and the cross-linking agent N,N'-methylenebisacrylamide (MBAM) was added. The ratio of crosslinking agent to monomer is 1:3. A dispersant polyethyleneimine (PEI) was then added to prepare a premix. Add titanium carbide powder and ball mill to obtain a slurry with a solid content of about 50vol%, and the viscosity of the slurry is about 300-600mPa.s. Ammonium persulfate (APS) is added as an initiator, wherein the amount of the initiator added is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Curing in the temperature range of 40-50 ℃ for 20-60min. Take it out and get a wet biscuit after demoulding. Then put the wet biscuit in a constant temperature and constant humidity oven, and dry it for 24-96 hours at 50-70°C and a relative humidity of 80-95%, and finally obtain a defect-free gel-cast bisque by a multi-step drying method.

Embodiment 3

[0018] The monomer N,N-dimethylacrylamide was dissolved in deionized water to make a 15wt% solution, and the cross-linking agent N,N'-methylenebisacrylamide (MBAM) was added. The ratio of crosslinking agent to monomer is 1:6. Then add the dispersant tetramethylammonium hydroxide to prepare the premix. Add boron carbide powder and ball mill to obtain a slurry with a solid content of about 57vol%, and the viscosity of the slurry is about 400-600mPa.s. Azo(2-mimidylpropane) hydrochloride (AZAP·2HCl) is added as an initiator, wherein the amount of the initiator added is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Curing in the temperature range of 40-60°C for 30-90min. Take it out and get a wet biscuit after demoulding. Then put the wet green body in a constant temperature and constant humidity oven, and dry it for 60-96 hours at 60-80° C. and a relative humidity of 85-95%, and finally adopt a multi-step drying method t...

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Abstract

Aiming at the shortcoming that crackles easily appear in gelatin casting wet biscuit, the invention provides an improved curing and drying proposal which can effectively heal the micro crackles appeared owing to demoulding, moving and too fast volatilization of surface solvent of the wet biscuit and ensures that complete and flawless biscuit is obtained after drying. The crackle healing proposal provided by the invention mainly comprises two steps which are curing and drying. In the curing stage, the gelation process of the monomers in the slurry is controlled by regulating a controlling curing temperature and curing time so as to ensure that part of cured monomers form gelatin in a bond crossing way and the other part of monomer are still preserved in the form of the monomers. In the subsequent drying process, the constant temperature and humidity drying proposal is adopted for causing the remained monomers in the biscuit to continously be cured and form bridging among sides of crackles, thus promoting the healing of the crackles. The crackle healing proposal provided by the invention has simple and reliable technique and is suitable for the preparation of blocks or porous ceramics.

Description

technical field [0001] The present invention relates to a method of promoting the healing of cracks in gel cast biscuits. The invention belongs to the preparation technology and application field of ceramics. Background technique [0002] With the development of modern science and technology, the advanced preparation technology of high-performance ceramic components has become one of the focus and hot spots of research, especially the preparation technology of large-sized and complex-shaped products. Ceramic materials are not only prone to defects during the molding process, but also the formed defects are often difficult to make up and eliminate through subsequent processes. In addition, the high hardness and high wear resistance of ceramic materials make subsequent processing difficult and expensive. For products with complex shapes, the processing problem is particularly difficult. Therefore, molding technology, as a key link in the preparation process, directly affects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B11/24C04B35/624
Inventor 张景贤江东亮林庆玲陈忠明黄政仁
Owner 中国科学院上海硅酸盐研究所苏州研究院
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