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Method of preparing zirconium oxide ceramic by curtain coating method and product obtained from said method

A technology of zirconia ceramics and casting method is applied in the field of preparing zirconia ceramics by casting method and products obtained therefrom, which can solve the problems of low solid phase content, large sintering deformation, difficult control of product size, etc. The effect of reducing specific surface area and increasing solid content

Inactive Publication Date: 2004-10-06
珠海粤科京华电子陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a relatively low solid phase content (mainly inorganic material content) of the slurry, which eventually leads to a serious deterioration in the formability of the green body and the performance of the sintered ceramic body.
Therefore, the powder cannot meet the needs of the current traditional casting production
[0004] 2. The low solid phase content of the slurry will lead to severe cracking during the casting process, and it is very difficult to dry, and the green body is easy to curl and deform during drying.
At the same time, the sintering deformation is relatively large, the product size is difficult to control, and the yield is extremely low.
Therefore, this powder cannot be directly adapted to the large-scale production of zirconia ceramic substrates that require large areas and high precision.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0013] The basic steps are as follows:

[0014] 1. Calcining zirconia micropowder with partially stabilized tetragonal crystal phase produced by ordinary wet chemical method at 600-800°C for 1 hour for pretreatment. The dispersibility of the pretreated powder is improved, the specific surface area of ​​the powder is effectively reduced, the viscosity of the slurry is reduced, and the solid phase content of the slurry is increased.

[0015] 2. Put the pretreated zirconia micropowder into a ball mill, then add 1% of the corresponding dispersant, 50% of solvent, and 0.5% of leveling agent, and ball mill for 10 hours to make a slurry. Add 2% of plasticizer and 3% of adhesive to the above-mentioned primary slurry, and then ball mill for 10 hours to make casting slurry (the above are weight percentages, calculated based on the weight of zirconia powder). Dispersant is castor oil or phosphoric acid ester in the above-mentioned formula, and binding agent is polyvinyl butyral PVB, and...

Embodiment approach 2

[0018] The basic steps are as follows:

[0019] 1. Calcining zirconia micropowder with partially stabilized tetragonal crystal phase produced by ordinary wet chemical method at 600-800°C for 2 hours for pretreatment. The dispersibility of the pretreated powder is improved, the specific surface area of ​​the powder is effectively reduced, the viscosity of the slurry is reduced, and the solid phase content of the slurry is increased.

[0020] 2. Put the pretreated zirconia micropowder into a ball mill, then add 2% of the corresponding dispersant, 55% of solvent, and 2% of leveling agent, and ball mill for 10 hours to make a slurry. Add 6% of plasticizer and 6% of adhesive to the above-mentioned primary slurry, and then ball mill for 10 hours to make casting slurry (the above are weight percentages, calculated based on the weight of zirconia powder). Dispersant is castor oil or phosphoric acid ester in the above-mentioned formula, and binding agent is polyvinyl butyral PVB, and ...

Embodiment approach 3

[0023] The basic steps are as follows:

[0024] 1. Calcining zirconia micropowder with partially stabilized tetragonal crystal phase produced by ordinary wet chemical method at 600-800°C for 3 hours for pretreatment. The dispersibility of the pretreated powder is improved, the specific surface area of ​​the powder is effectively reduced, the viscosity of the slurry is reduced, and the solid phase content of the slurry is increased.

[0025] 2. Put the pretreated zirconia micropowder into a ball mill, then add 3% of the corresponding dispersant, 60% of solvent, and 3% of leveling agent, and ball mill for 10 hours to make a slurry. Add 8% of plasticizer and 10% of adhesive to the above-mentioned primary slurry, and then ball-mill for 10 hours to make casting slurry (the above are weight percentages, calculated based on the weight of zirconia powder). Dispersant is castor oil or phosphoric acid ester in the above-mentioned formula, and binding agent is polyvinyl butyral PVB, and...

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Abstract

A process for preparing the zirconium oxide ceramics by doctor blading method includes calcining the square-crystal zirconium oxide powder at 600-800 deg.C for 1-3 hr, proportionally mixing it with disperser, solvent and homogenizing agent, ball grinding for 10 hr, adding plasticizer and defoaming agent, ball grinding for 10 hr, vacuum stirring for defoaming, doctor blading, drying at 60-100 deg.C for 2-3 hr, degumming by heating to 600 deg.C and holding the temp for 4 hr, and sintering at temp lower than 1540 deg.C for 2-4 hr.

Description

technical field [0001] The present invention relates to a method for preparing zirconia ceramics by casting method and the products obtained by the method. Background technique [0002] Tape casting (Tape Casting) is a molding method that can obtain high-quality, ultra-thin ceramic substrates. At present, it has been able to form many thin ceramic materials except zirconia, such as alumina, aluminum nitride, and barium titanate. Wait. It is characterized by stable process, high production efficiency, automatic continuous production, high product quality and low mass production cost. The conventional thickness required by general ceramic substrates is 0.4-1.0mm, and the dimensional accuracy is high. The production of cast ceramic substrates with this thickness requires very strict requirements on the average particle size of the ceramic powder. The average particle size of the powder measured by the laser method must be stable at 2-3 μm. When the average particle size of t...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/488C04B35/622C04B35/63C04B35/64
Inventor 周和平党桂彬吴崇隽
Owner 珠海粤科京华电子陶瓷有限公司
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