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Liquid phase pretreatment method for gelcasting ceramic blank before binder burning out

A technology of gel injection molding and ceramic body, which is applied in the field of ceramic molding, can solve the problems of low yield and difficulty, and achieve the effect of low cost and simple process

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the ceramic green body prepared by this method has a low content of organic matter, because the organic monomers are cross-linked with each other to form a spatial network structure, it is very difficult to debinding using the traditional thermal degreasing process, especially for large cross-sections. The yield rate of debinding ceramic green bodies is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Commercially available α-Al 2 o 3 As a raw material, the average particle size of the particles is 3 μm. A cylindrical blank with a diameter of 6.4 cm and a height of 5.9 cm was prepared by gel injection molding. Make a 20wt% solution with ammonium persulfate, immerse the green body in 200ml of the solution, and treat it at 60°C for 10 hours. After the treatment, take it out, dry it in the shade at room temperature 25°C for 3 days, dry it at 80°C for 3 days, and then degumming at 150°C for 50 hours to get a complete green body without cracks.

Embodiment 2

[0022] Commercially available ZrO 2 As a raw material, the average particle size of the particles is 1.5 μm, and a cylindrical green body with a diameter of 6.4 cm and a height of 5.9 cm is prepared by gel injection molding. Make a 0.8wt% solution with potassium persulfate, immerse the green body in 200ml of the solution, let stand at 80°C for 10 hours, and change the solution every 1 hour therebetween. After the treatment, take it out and dry it in the shade for 3 days, then dry it at 80°C for 3 days, and then degumming at 600°C for 8 hours to get a complete green body without cracks.

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Abstract

The present invention belongs to the field of ceramic forming technology, and is the new liquid phase pre-treatment method of degrading organic matter in biscuit to prevent cracking during eliminating glue. The ceramic biscuit after gel injection molding is liquid phase pre-treated inside water solution o ammonium persulfate or potassium persulfate before eliminating glue. Under the action of peroxide, the polymer inside the ceramic biscuit is chain breaking degraded, the netted macro molecule becomes small molecule and internal stress in the biscuit is released. The biscuit thus treated will not crack and will have no fault during overheat defatting and glue eliminating. The present invention is simple in technological process, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical scope of ceramic forming, and in particular relates to a new method of liquid-phase pretreatment for debinding of a gel injection molded ceramic body by degrading organic matter in the body to ensure that the ceramic body does not crack during the debinding process. Background technique [0002] The preparation process of high-performance ceramic materials and components is the premise of the development and application of ceramic materials. The molding process plays a connecting role in the entire preparation process of ceramic materials. It is the key to ensuring the reliability, yield and repeatability of ceramic materials and components, and is directly related to industrialization and large-scale production. The molding process of ceramics is divided into two categories: dry molding and colloidal molding. The uniformity of the green body formed by the dry method is poor, and it is difficult to overcome the a...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B41/85
Inventor 杨金龙戴春雷黄勇
Owner TSINGHUA UNIV
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