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Method of manufacturing ceramic green body

A green body and ceramic technology, which is applied in the direction of ceramic molding machines, manufacturing tools, cold cathode manufacturing, etc., can solve problems such as green body damage and achieve the effect of preventing damage

Inactive Publication Date: 2010-05-05
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The demoulding process described above may include the following problems: when the core is thermally fused, thermal expansion forces act on the green body and cause damage to the green body, such as cracks

Method used

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  • Method of manufacturing ceramic green body
  • Method of manufacturing ceramic green body
  • Method of manufacturing ceramic green body

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] according to figure 1 The preparation process shown in the embodiment embodies the method for preparing hollow ceramic green bodies according to the present invention. according to figure 2 The preparation process shown in exemplifies the method for preparing a solid ceramic green body according to the present invention.

[0029] In the preparation method, a ceramic paste that causes the green body in the mold to show a volume shrinkage rate of 5% or less is selected as the molding paste. Therefore, in the process of preparing the ceramic green body by molding, no damage to the green body, such as cracks, is generated in the mold, otherwise, the green body shrinks and will cause damage.

[0030] If proper measurement is not performed, the green body with the low volume shrinkage rate will show high resistance to demolding from the mold and is easily damaged. Therefore, the production method utilizes a demolding process that smoothly demolds the green body from the mold to ...

Embodiment

[0087] according to figure 1 The preparation steps of the hollow ceramic green body were prepared experimentally. The following two kinds of molding pastes were used in the experimental preparation: ceramic paste (slurry A) for forming a green body with a low volume shrinkage rate of 5% or less as measured in the mold; and for forming as in the mold Measured, the ceramic paste (slurry B) of the green body having a high volume shrinkage rate of 5% or more.

[0088] image 3 (a)-3(c) graphically show the preparation steps in the experiment. Figure 4 (a) A diagram shows the steps of discharging the wax-molded body of the core in the hollow ceramic green body in a molten state in the experiment, and Figure 4 (b) A diagram shows the hollow ceramic green body demolded from the outer mold in the experiment. Table 1 shows the composition and characteristics of ceramic paste A and B.

[0089] Table 1

[0090] Molding paste

[0091] Composition, dosage, characteristics

Pulp A

Pulp B...

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PUM

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Abstract

A method for producing a ceramic formed article which comprises forming a ceramic formed article by the use of the gel cast method, heating the resulting formed article to take out a solvent containedin the ceramic formed article to the exterior of the article, and then releasing the article from a mold. The solvent taken out from the article forms a solvent film between the outer surface of thearticle and the inner surface of the mold and the solvent film aids the release of the article from the mold. Thus, the above method can be used for preventing such a ceramic formed article from beingdamaged in a releasing operation.

Description

Technical field [0001] The invention relates to a method for preparing ceramic green bodies. Background technique [0002] According to the known method for preparing ceramic green bodies, a ceramic slurry containing ceramic powder, a dispersion medium and a gelling agent is molded in a mold, and the resulting molded product is released from the mold to obtain ceramics Green body. This preparation method is the so-called gel casting method. Traditionally, a method of preparing a solid ceramic green body by gel casting has been proposed (for example, in Japanese Patent Application Publication (kokai) No. H01-261251). Also, a method of preparing a hollow ceramic green body or a ceramic green body having a cavity therein by gel casting has been proposed (for example, in Japanese Patent Application Publication (kokai) No. 2002-216626). [0003] The method for preparing ceramic green bodies proposed in the above-mentioned patent documents is a gel casting method, which uses a specifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B13/06B28B1/14C04B35/00B28B7/34B28B7/38B28B11/24C04B35/111
CPCC04B2235/6023C04B2235/6582C04B35/6264C04B35/62655B28B13/065B28B7/342C04B35/62625C04B35/6263C04B35/111C04B2235/94C04B35/624H01J9/247
Inventor 宫泽杉夫
Owner NGK INSULATORS LTD