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Gel casting forming method for high-voltage dielectric ceramic

A technology of gel injection molding and dielectric ceramics, which is applied in ceramic molding machines, chemical instruments and methods, clay processing equipment, etc., can solve problems such as pollution, toxicity, and unfavorable development, and achieve simple process operation, environmental friendliness, and non-toxicity. Pollution, overcoming the effect of body surface oxidation

Active Publication Date: 2009-09-30
XIAN YISH ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because when the initiator and catalyst exist, the polymerization reaction of the monomer is easy to occur under vacuum conditions, so it is difficult to carry out the vacuum defoaming method commonly used.
In addition, from an environmental point of view, the monomers used in gel injection molding are highly toxic and will cause certain pollution, which is not conducive to long-term development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Make sure to prepare a suspension with a solid phase volume content of 45%. First weigh barium titanate powder (theoretical density 6g / cm 3 ) and 150g of zirconia balls, put the balls into the ball mill jar, the volume of water added can be calculated as (150×55) / (6×45)=30.56ml;

[0018] 2) Slowly add barium titanate powder, and stir while adding, when the viscosity increases slightly, add 0.45ml of dispersant, which is 3‰ of the powder mass, and stir;

[0019] 3) Add 0.61 g of agarose, which is 20‰ of the mass of water, stir, and continue to add barium titanate powder until the addition is complete;

[0020] 4) ball milling and mixing the slurry obtained in the previous step for 24 hours;

[0021] 5) The inner surface of the metal mold is coated with a release agent in advance, and the suspension obtained in the previous step is poured and filled;

[0022] 6) Put the sample obtained in the previous step into an oven at 90°C for 30 minutes to fully dissolve the ag...

Embodiment 2

[0024] 1) Make sure to prepare a suspension with a solid phase volume content of 50%. First weigh barium titanate powder (theoretical density 6g / cm 3 ) and 150g of zirconia balls, the balls are put into the ball mill jar, and the added water volume can be calculated as 150 / 6=25ml;

[0025] 2) Slowly add barium titanate powder, and stir while adding, when the viscosity increases slightly, add 0.45ml of dispersant, which is 3‰ of the powder mass, and stir;

[0026] 3) Add 0.5 g of agarose, which is 20‰ of the mass of water, stir, and continue to add barium titanate powder until the addition is complete;

[0027] 4) ball milling and mixing the slurry obtained in the previous step for 24 hours;

[0028] 5) The inner surface of the metal mold is coated with a release agent in advance, and the suspension obtained in the previous step is poured and filled;

[0029] 6) Put the sample obtained in the previous step into an oven at 90°C for 30 minutes to fully dissolve the agarose. T...

Embodiment 3

[0031] 1) Make sure to prepare a suspension with a solid phase volume content of 55%. First weigh barium strontium titanate powder (theoretical density 6g / cm 3 ) and 150g of zirconia balls, put the balls into the ball mill jar, the volume of water added can be calculated as (150×45) / (6×55)=20.45ml;

[0032] 2) Slowly add strontium barium titanate powder, and stir while adding, when the viscosity increases slightly, add 0.45ml of dispersant, which is 3‰ of the powder mass, and stir;

[0033] 3) Add 0.307 g of agarose, which is 15‰ of the mass of water, stir, and continue to add strontium barium titanate powder until the addition is complete;

[0034] 4) ball milling and mixing the slurry obtained in the previous step for 24 hours;

[0035] 5) The inner surface of the metal mold is coated with a release agent in advance, and the suspension obtained in the previous step is poured and filled;

[0036] 6) Put the sample obtained in the previous step into an oven at 90°C for 30 m...

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Abstract

The invention relates to a casting formingmethod for producing dielectric ceramic. Barium titanate powders, dispersants, agarose and deionized water are mixed through ball milling according to a certain proportion; experiment on the rheological property is carried out on the obtained suspension liquid after ball milling for certain time, and casting is carried out under the room temperature; and green bodies obtained by casting together with molds are put in a drying oven of 90 DEG C. The method has the advantages that firstly the defects of the traditional forming method are overcome, the gel casting technology is adopted for forming, and novel environment-friendly and non-pollution nontoxic gel system agarose is used, great improvement is made in regulating the gel technology, the gel forming time is controlled through changing the using amount of the components of a gel system, the gel temperature, and the like, so that forming in short time can be realized, and the settlement of suspended solids is reduced to obtain evenly formed ceramic green bodies with little defect. Compared with other methods, the invention has the advantages of moderate reaction conditions, simple technological operation, non-toxicity, no pollution, high forming quality of green bodies, small internal stress and small cracks, so that the dielectric ceramic has a broader application prospect in the high voltage field.

Description

technical field [0001] The invention relates to a gel injection molding method for high-voltage dielectric ceramics. The method adopts an environment-friendly gel agent agarose and combines a gel injection molding process to prepare dielectric ceramics. Background technique [0002] Pulse forming (dielectric ceramic) technology is an important topic in the research of high voltage pulses, and pulse forming lines are key components in pulse power equipment. Its miniaturization is of great significance to reduce the volume of the overall equipment. At present, foreign countries have used high-dielectric ceramics, such as titanium dioxide and barium titanate, to replace traditional water media as pulse-forming lines to reduce their volume, but domestic research in this area is still in its infancy. Due to the high voltage and the requirements of high dielectric constant and small size, it is required that the ceramic body must have very few internal defects and have a relative...

Claims

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Application Information

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IPC IPC(8): B28C1/04B28C1/08B28B1/14B28B7/38B28B11/24B02C17/20C04B35/468
Inventor 陈维刘斌周芳
Owner XIAN YISH ELECTRIC
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