Method for curing ceramic slurry by controlling sustained release of high-valence counter ions through temperature

A technology of ceramic slurry and temperature control, which is applied in the field of solidification of inorganic non-metallic ceramics, can solve the problems of long curing time and easy cracks, and achieve the effects of simple operation, avoiding cracking and facilitating industrial production

Inactive Publication Date: 2012-06-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing direct solidification molding method, such as long curing time and eas...

Method used

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  • Method for curing ceramic slurry by controlling sustained release of high-valence counter ions through temperature
  • Method for curing ceramic slurry by controlling sustained release of high-valence counter ions through temperature
  • Method for curing ceramic slurry by controlling sustained release of high-valence counter ions through temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 5g / L calcium iodate solidifies 50vol% Al dispersed in 0.2wt% ammonium citrate 2 o 3 slurry.

[0026] 50vol% Al dispersed in 0.2wt% ammonium citrate and fully ball milled at 10°C 2 o 3 Add 0.5g of calcium iodate to 100ml of slurry, mix ball mill for 20min, exhaust and inject mold, treat in water bath at 65-70℃ for 1h-2h, demould, dry at 80℃ for 24h, then heat up at 5℃ / min to 1500-1550℃ for 2h Sintering to obtain a ceramic sintered body.

Embodiment 2

[0028] 6.25g / L calcium iodate solidifies 50vol% Al dispersed in 0.3wt% ammonium citrate 2 o 3 slurry.

[0029] 50vol% Al dispersed in 0.3wt% ammonium citrate and fully ball milled at 10°C 2 o 3 Add 0.625g of calcium iodate to 100ml of slurry, mix ball mill for 20min, exhaust and inject mold, treat in water bath at 60~70℃ for 1h~2h, demould, dry at 80℃ for 24h, then raise temperature at 5℃ / min to 1500~1550℃ for 2h Sintering to obtain a ceramic sintered body.

Embodiment 3

[0031] 7.5g / L calcium iodate solidifies 50vol% Al dispersed in 0.4wt% ammonium citrate 2 o 3 slurry.

[0032] 50vol% Al dispersed in 0.4wt% ammonium citrate and fully ball milled at 10°C 2 o 3 Add 0.75g of calcium iodate to 100ml of slurry, mix ball mill for 20min, exhaust and inject mold, treat in water bath at 60~70℃ for 1h~2h, demould, dry at 80℃ for 24h, then heat up at 5℃ / min to 1500~1550℃ for 2h Sintering to obtain a ceramic sintered body.

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Abstract

The invention relates to the technical field of curing of inorganic nonmetal ceramics and particularly relates to a method for curing ceramic slurry by controlling sustained release of high-valence counter ions through temperature. The method comprises the following steps: mixing ammonium citrate, water and ceramic powder, fully performing ball milling to prepare the ceramic slurry with negative electricity on the surfaces of particles, cooling to 10 DEG C, then adding calcium iodate and performing ball milling; performing exhaust and injection molding on the obtained slurry, performing water bath treatment, then performing demolding to get a ceramic wet green, and drying to get a dried green; and then placing in an electric furnace to sinter so as to get a ceramic sintered body. The ceramic particles stably exist in water with same charges, and coagulation of the ceramic slurry can be realized by adopting the high-valence ions with the charges which are opposite to the charges carried by the ceramic particles so as to achieve solidification; and the density of a biscuit obtained by the method disclosed by the invention is 53%-55% of theoretical density, the shrinkage rate is 2%-4%, the density of the sintered body is 97%-99% of the theoretical density, the shrinkage rate is 17%-20%, and the method has the advantages of being suitable for any ceramic slurry with the negative electricity, environment-friendly, simple in operation and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic ceramic solidification, in particular to a method for temperature-controlled high-valent counterion slow-release solidification ceramic slurry. Background technique [0002] Ceramic colloidal molding technology, because it can effectively control particle agglomeration, reduce green body defects, prepare high-density uniform green body, and significantly improve the mechanical properties of ceramics, is considered to be the best way to solve the reliability of ceramic materials. The colloidal molding technology first prepares a stable ceramic slurry with high solid content and low viscosity, and realizes the curing of the ceramic slurry through various curing methods to form a green body. Gel casting (gelcasting) is achieved through the polymerization of organic monomer molecules to achieve curing. Although high green body strength can be obtained through organic polymerization, wh...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/63C04B35/10
Inventor 杨金龙许杰温宁李和欣席小庆齐飞
Owner TSINGHUA UNIV
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