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Gellan gum gel-based ceramic gel injection molding method

A technology of gel injection molding and gellan gum, which is applied in the field of inorganic non-metallic ceramics, can solve the problems of easy cracking of the green body, harsh drying conditions, and low degree of process automation, and achieve the advantages of avoiding cracking, simple operation, and environmental friendliness Effect

Inactive Publication Date: 2013-05-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the drying conditions are harsh, the green body is easy to crack, monomer acrylamide is harmful to the human nervous system, and the degree of automation of the process is not high
Although people have developed a series of non-toxic gel systems, their gel effects are not as good as acrylamide monomers, and their industrial applications are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Gellan Gum Gel Casting Molding Negatively Charged Alumina Ceramic Slurry

[0023] 220 grams of alumina, 0.8 grams of ammonium citrate and 45 grams of water were mixed, ball milled for 12 hours and vacuum defoamed for 30 minutes to prepare a ceramic slurry with a solid phase volume fraction of 55%; the ceramic slurry was placed in Incubate in a water bath at 70°C for 10 minutes; add 0.3 g of gellan gum to 10 g of water and heat up to 70°C to prepare an aqueous solution; add 0.05 g of calcium chloride to 1 g of water to prepare an aqueous solution; mix gellan gum solution and calcium chloride solution Add to the ceramic slurry and stir for 8 minutes, pour into a plastic mold, cool to room temperature, release the mold after 5 hours, dry at 80°C for 48 hours, and sinter at 1550°C to obtain a ceramic sintered body.

Embodiment 2

[0024] Example 2: Gellan Gum Gel Casting Positively Charged Alumina Ceramic Slurry

[0025] 220 grams of alumina, 7 grams of 2mol / L hydrochloric acid solution and 45 grams of water were mixed, and after ball milling for 24 hours, vacuum defoaming was performed for 30 minutes to prepare a ceramic slurry with a solid phase volume fraction of 55%; Place in a water bath at 70°C for 10 minutes; add 0.3 g of gellan gum to 10 g of water, and raise the temperature to 70°C to prepare an aqueous solution; add 0.06 g of magnesium chloride to 1 g of water to prepare an aqueous solution; mix gellan gum solution and calcium chloride solution Add to the ceramic slurry and stir for 5 minutes, pour into a stainless steel mold, cool to room temperature, demould after 8 hours, dry at 100°C for 24 hours, and sinter at 1550°C to obtain a ceramic sintered body.

Embodiment 3

[0026] Example 3: Gellan Gel Casting Zirconia Ceramic Slurry

[0027] 220 grams of zirconia, 5 grams of ammonium polyacrylate and 45 grams of water were mixed, and after ball milling for 24 hours, vacuum defoaming was performed for 30 minutes to prepare a ceramic slurry with a solid phase volume fraction of 55%; the ceramic slurry was placed in Keep warm in a water bath at 70°C for 10 minutes; add 0.4 g of gellan gum to 10 g of water and heat up to 70°C to prepare an aqueous solution; add 0.1 g of magnesium sulfate to 1 g of water to prepare an aqueous solution; add gellan gum solution and calcium chloride solution into the ceramic slurry and stirred for 5 minutes, poured into a rubber mold, cooled to room temperature, demolded after 10 hours, dried at 100°C for 24 hours, and sintered at 1650°C to obtain a ceramic sintered body.

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Abstract

The invention discloses a gellan gum gel-based ceramic gel injection molding method, which belongs to the technical field of inorganic non-metal ceramic. The method comprises the following steps of: mixing ceramic powder, a dispersant and water to prepare ceramic slurry; defoaming under vacuum and then preserving heat in a water bath of 50-70 DEG C for 10-20 minutes; meanwhile, heating mixture of gellan gum and water to 70-80 DEG C to prepare uniform and stable aqueous solution with mass fraction of 1-5 percent; and adding the gellan gum aqueous solution and the aqueous solution containing calcium ions or magnesium ions with mass fraction of 1-10 percent into the prepared ceramic slurry and stirring for 5-10 minutes; finally preparing a ceramic blank in an imperforated mold; and sintering the ceramic blank to obtain a compact ceramic sintered body. The method provided by the invention has the advantages of economy, environmental friendliness, easiness in operation and convenience in industrial production, and the prepared compact ceramic sintered body has superior performance and wide application.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic ceramics, in particular to a ceramic gel injection molding method based on gellan gum gel. Background technique [0002] Ceramic colloidal molding has the advantages of low cost, simple operation, suitable for preparing ceramic parts with complex shapes, and avoids complicated machining steps. Therefore, it has received extensive attention at home and abroad as soon as it appeared. The colloidal molding method does have unparalleled advantages in the preparation of complex-shaped ceramic parts, and can effectively control the microstructure of the material, reduce various defects inside the material, and improve the mechanical properties and reliability of the material. . Further improving the reliability of materials, reducing manufacturing costs, reducing operating steps and adapting to environmental protection requirements, and transforming them into commercially applicable prod...

Claims

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Application Information

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IPC IPC(8): B28B1/14B28B17/02C04B35/10C04B35/48C04B35/584C04B35/565
Inventor 杨金龙许杰张艳学渠亚男张笑妍席小庆
Owner TSINGHUA UNIV
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