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Gel casting molding method based on gelose and ceramic slurry mixed solution

A technology of gel injection molding and ceramic slurry, which is applied in the field of ceramic materials, can solve the problems of water loss, inconvenient process, and temperature rise, and achieve the effect of less organic matter content, excellent effect, and increased solid phase content

Active Publication Date: 2016-11-09
湖北迪洁膜科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method also has disadvantages: the vacuum defoaming of the ceramic slurry removes the air bubbles to a certain extent, but the ceramic slurry after vacuum defoaming before injection molding needs to be heated, and then the agarose dissolved at high temperature is added Solution, mixing, stirring, cooling and forming
The agarose solution is heated during the preparation process, and the water in the system will also be lost. During the process operation, it is easy to cause water evaporation and bubbles will be generated during the stirring process, which will affect the compactness of the ceramics, so it brings inconvenience to the process.
In addition, it is difficult to further increase the solid content of general ceramic slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Measure 10ml of distilled water and add it to the ball mill jar, and add a total of 68.78g of zirconia powder (theoretical density is 6.1g / cm 3 , particle size is 1um) and mass fraction of 0.8% ammonium citrate (about 0.55g) was added to the ball mill at one time and stirred to make a zirconia ceramic slurry with a solid phase volume fraction of 53%. 0.481 g of agarose powder was added to 10.2 ml of distilled water to prepare an agarose solution with a mass fraction of 4.5%, and all of it was added to the zirconia ceramic slurry to mix and stir evenly. The pH of the obtained mixed slurry was adjusted to 8 with ammonia water, ball milled for 24 hours, and then vacuum defoamed at room temperature for 60 minutes. After the vacuum defoaming is completed, inject the mixed slurry into a non-porous glass mold at room temperature, and then put the mold into a 90°C oven to fully heat, and the mixed slurry does not need to be stirred during this process. After it is cooled to ro...

Embodiment 2

[0020] Measure 10ml of distilled water and add it to the ball mill jar, and add a total of 87.8g of zirconia powder (theoretical density is 6.1g / cm 3 , a particle size of 1um) and a mass fraction of 0.8% ammonium citrate (about 0.7g) was added to a ball mill at one time and stirred to prepare a zirconia ceramic slurry with a solid phase volume fraction of 59%. 0.615g of agarose powder was added to 19.9ml of distilled water to make an agarose solution with a mass fraction of 3.0%, and all of it was added to the zirconia ceramic slurry to mix and stir evenly. The pH of the obtained mixed slurry was adjusted to 9 with urea, ball milled for 24 hours, and then vacuum defoamed at room temperature for 60 minutes. After the vacuum defoaming is completed, the mixed slurry is injected into a non-porous metal mold at room temperature, and then the mold is placed in a 90°C water bath to fully heat, and the mixed slurry does not need to be stirred during this process. After it is cooled t...

Embodiment 3

[0022] Measure 10ml of distilled water and add it to the ball mill jar, and add a total of 77.7g of zirconia powder (theoretical density is 6.1g / cm 3 , a particle size of 1um) and a mass fraction of 0.8% ammonium citrate (about 0.622g) was added to a ball mill at one time and stirred to prepare a zirconia ceramic slurry with a solid phase volume fraction of 56%. 0.544g of agarose powder was added to 11.54ml of distilled water to make an agarose solution with a mass fraction of 4.5%, and all of it was added to the zirconia ceramic slurry to mix and stir evenly. The pH of the obtained mixed slurry was adjusted to 10 with urea, ball milled for 24 hours, and then vacuum defoamed for 60 minutes at room temperature. After the vacuum defoaming is completed, the mixed slurry is injected into the non-porous rubber mold at room temperature, and then the mold is placed in a 90°C water bath to fully heat, and the mixed slurry does not need to be stirred during this process. After it is c...

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Abstract

The invention discloses a gel casting molding method based on a gelose and ceramic slurry mixed solution. The method comprises the specific steps that firstly, ceramic powder and a dispersing agent are added into water for preparing ceramic slurry with the solid phase volume fraction of 53-59%; then a gelose solution with the concentration of 3-4.5 wt% is added into the ceramic slurry, so that the pH value is regulated to 8-11, and the ceramic slurry is made even by means of ball-milling; the mixed slurry is injected into an imperforate mould for to be heated sufficiently after vacuum bubble removing is conducted; and then ceramic parts are obtained after cooling, drying and sintering are conducted. Due to the fact that the gelose solution and the ceramic slurry are mixed firstly and made even by means of ball-milling, and then are subjected to vacuum bubble removing and casting molding, bubbles are not generated in the process, and ceramic blanks are free of defects. By means of the method, the mixed slurry with the high solid phase content and the low viscosity can be prepared, and the compact ceramic parts in complicated shapes and with different sizes can be obtained after the blanks are sintered. In addition, the gelose is naturally macromoledular, the organic content in the blanks is low, and debonding is not needed; and the ceramic blanks have certain strength and can be processed to a certain extent before being sintered.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a gel injection molding method based on a mixed solution of agarose and ceramic slurry. Background technique [0002] Gel injection molding is a ceramic net size molding technology invented by Oak Ridge National Laboratory in the early 1990s. This technology combines ceramic molding technology with polymer chemistry, and polymer monomers of polymer chemistry Introduced into the ceramic molding process. The gel injection molding process is suitable for preparing ceramic parts with complex shapes. The solid content of the slurry is high and the green body has a certain strength, which can be machined before ceramic sintering. The AM-MBAM system is a gel system used in industrial production. The reaction of this system is controllable and adaptable. The resulting gel strength is very high, the price is low, and the source is wide. However, AM and MBAM have ne...

Claims

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Application Information

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IPC IPC(8): B28B1/26C04B35/48C04B35/10C04B35/565
CPCB28B1/26B28B1/261C04B35/10C04B35/48C04B35/565
Inventor 陈常连王璀璨黄小雨余涵宇
Owner 湖北迪洁膜科技有限责任公司
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