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Sizing material for improving ceramic shaped body prepared by gel pouring shaping method

A technology for casting and molding, which is used in clay preparation devices, mixing operation control, clay processing equipment, etc. The effect of the ability to initiate curing

Inactive Publication Date: 2007-04-18
SHANGHAI GAOCHENG CREATIVE TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the fluidity of the slurry is not good and it is difficult to pour in the gel casting molding, the purpose of the present invention is to propose a slurry for improving the gel casting molding to prepare ceramic molding. The proposed slurry adopts a new type of slurry The slurry is used to improve the fluidity of the slurry, and finally obtain high-quality ceramic green body and sintered body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Prepare two kinds of slurries respectively by the prescription listed in table 1, place at normal temperature, formula 1 measures apparent viscosity under the condition that shear rate is 10 / s after placing 5 hours, and size is 150mPa.s, and The apparent viscosity of the comparative component under the same conditions after 2 hours exceeds 500 mPa.s.

[0026] components

example 2

[0028] Prepare 3 parts of slurry according to formula 1 in Example 1, add 0.5 mL of 10% azobis(2-imidazolylpropane) aqueous solution respectively after degassing to obtain slurry A, and add 0.5 mL of 10% ammonium persulfate to obtain slurry B , Add 0.01 g of tetramethylethylenediamine and 0.3 mL of 10% ammonium persulfate to obtain slurry C. Slurry A still has good fluidity after 1 hour, slurry B cannot flow after about 20 minutes, and slurry C has significantly worse fluidity after about 5 minutes. The slurry A is poured into the mold, the temperature is raised to 60°C and maintained for 20 minutes, after the temperature is lowered, the mold is demolded and dried to obtain a green body with a strength of about 20 MPa.

example 3

[0030] Add 3 g of N-methacrylamide and 0.5 g of methylenebisacrylamide to 24 g of water to form a pre-preparation solution, add 100 g of alumina powder (d50 = 0.3 μm), 3 g of dispersant (Lopon 885, 50% ammonium polyacrylate) under stirring Salt) and 5g of yttrium oxide powder are used as sintering aids to make a slurry, and the alkalinity is adjusted to about pH 10 with tetramethylammonium hydroxide. After degassing, add 0.3mL of 10% azobis(2-imidazolylpropane), heat to 60°C after injection molding and solidify to obtain alumina ceramic green body.

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PUM

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Abstract

The present invention relates to a slurry material for preparing ceramic forming body. The described slurry material is made up by using water, ceramic powder, N-substituted acrylamide or methyl acrylamide monomer, cross-linking agent and water-soluble azo initiator, and can be used for improving gel injection forming process. Its preparation method includes the following steps: (1), using water, ceramic powder, N-substituted acrylamide or methyl acrylamide monomer, cross-linking agent and water-soluble azo initiator to make them into pre-mixing liquor, then adding ceramic powder boy under the condition of stirring so as to obtain the slurry. The mass percentage of added pre-mixing liquor is 10-100% of ceramic powder body; (2), in the pre-mixing liquor the mass percentage concentration of added monomer is 2-50% of pre-mixing liquor; the mass percentage concentration of added initiator is 0.1-10% of pre-mixing liquor; and the mass percentage concentration of added cross-linking agent is 0-10% of pre-mixing liquor.

Description

technical field [0001] The invention relates to a slurry for improving gel casting molding to prepare ceramic moldings. Background technique [0002] Gel casting (Gelcasting) is a new ceramic molding process that has emerged since the 1990s (see US Patent No. 4,894,194), and it can be widely used in the preparation of various ceramic green bodies. The principle is to add inorganic powder to an organic solvent containing vinyl monomers and cross-linking agents to make a suspension. Under the action of a free radical initiator, the monomers are polymerized into a gel, thereby obtaining a high-strength green body. US patents 5,028,362 and 5,145,908 use aqueous solution to prepare slurry, which greatly reduces the content of volatile organic components and improves the practicability of the process. US Patent No. 6,066,279 proposes a water-based polymerization system without cross-linking agent, which improves the performance of green body. [0003] However, the existing water...

Claims

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Application Information

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IPC IPC(8): C04B35/632B28C1/04B28C7/04
Inventor 张兆泉江东亮
Owner SHANGHAI GAOCHENG CREATIVE TECH GRP
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