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Silica sol solidification method for forming ceramic component

A technology of coagulation molding and silica sol, which is applied in the field of ceramic parts molding to achieve the effects of high drying strength, simple molding process, and convenient preparation

Inactive Publication Date: 2005-10-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, various complex shapes of ceramic parts can be formed without any defects such as cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Forming of alumina ceramic ring

[0023] Dissolve 140 ml of sodium hydroxide with a pH value of 11.9 and 60 ml of tetraethyl orthosilicate at room temperature, stir mechanically for 2 hours, and then leave for 5 days to obtain a silica sol solution. Then 700 grams of ceramic powder was added to the solution, and 7 milliliters of dispersant polyacrylate solution was added at the same time. Use a stirrer to stir for 1 hour to make it completely and evenly dispersed to obtain a stable ceramic slurry. Then inject the above ceramic slurry into the metal mold, place it at 15°C for curing, and the slurry solidifies in about 30 minutes to form a ceramic ring body with a certain strength, which can be demolded.

Embodiment 2

[0024] Example 2: Silicon carbide ceramic tube forming

[0025] Mix 100 ml of sodium hydroxide solution with a pH value of 12.3 and 35 ml of tetraethyl orthosilicate at room temperature, stir mechanically for 1.5 hours, and place it for 4 days to obtain a silica sol solution; then add 480 grams of silicon carbide ceramic powder to the above silica sol At the same time, 2 ml of tetramethylammonium hydroxide solution was added to the solution, and mechanically stirred for 1 hour to achieve complete dispersion, suspension and stable silicon carbide ceramic slurry. Immediately, the silicon carbide slurry was injected into a plastic mold, and the slurry was solidified after being placed at 10° C. for 25 minutes to obtain a silicon carbide ceramic tube body. After demoulding, the shape is intact, no cracks, no deformation.

Embodiment 3

[0026] Embodiment 3: Forming of silicon nitride ceramic green body

[0027] Mix 120 ml of sodium hydroxide solution with a pH value of 12.8 and 43 ml of tetraethyl orthosilicate at room temperature, stir for about 1 hour, and stand for 3 days to obtain a silica sol solution. Add 570 grams of silicon nitride ceramic powder into the silica sol solution to disperse and stir, and at the same time add 1.5 ml of polyacrylic acid solution as a dispersant, and mechanically stir for 1.5 hours to obtain a uniformly dispersed silicon nitride slurry, and then inject the slurry into the glass In the mold, the gel reacts and solidifies at 15°C. After about 40 minutes, the slurry solidifies to form a green body, which can be demoulded directly without damage.

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Abstract

The present invention relates to a method for producing ceramic component by utilizing silica sol coagulation forming process. Said method includes the following steps: mixing ethyl orthosilicate and sodium hydroxide solution, mechanically-stirring to make the ethyl orthosilicate be hydrolyzed to obtain silica sol, then adding the engineering ceramic powder into said silica sol solution, stirring and mixing then to obtain ceramic pulp material, injuecting said ceramic pulp material into a hole-free mould, coagulating at 25-10 deg.C and forming so as to obtain the ceramic blank body with required shape.

Description

technical field [0001] The present invention relates to a new method of forming ceramic components. By adopting this process, the non-viscous barren engineering ceramic slurry can be directly solidified to form a desired shape, and a ceramic green body with a certain strength can be obtained. It belongs to the technical field of material preparation. Background technique [0002] Engineering ceramic materials, such as alumina, zirconia, silicon nitride, silicon carbide, etc., have a series of excellent mechanical properties and chemical stability such as high strength, high hardness, high temperature resistance, wear resistance and corrosion resistance, so in There are more and more applications in modern science and technology and industrial fields (such as aerospace, chemical industry, machinery, information, electronics, life science, etc.). These materials are mostly used as a structural component, have various shapes, and require precise dimensions to achieve near-net...

Claims

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Application Information

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IPC IPC(8): C04B35/624
Inventor 谢志鹏黄勇罗杰盛高燕
Owner TSINGHUA UNIV
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