Method of preparing zirconium oxide ceramic by curtain coating method and product obtained by using the method

Abstract

The invention discloses a method for preparing zirconia ceramics by a casting method. (1) pretreating zirconia micropowder with a partially stable tetragonal crystal phase produced by a wet chemical method at 600-800° C. for 1-3 hours, and (2) ) the pretreated zirconia micropowder is added to the ball mill, and then based on the weight of the zirconia powder, 1-3% of the dispersant, 50-60% of the solvent, and 0.5-3% of the leveling agent are added according to the weight percentage, and the ball mill is made for 10 hours. into a slurry. Then add 2-8% plasticizer and 3-10% adhesive to the above-mentioned primary slurry to make casting slurry after secondary ball milling for 10 hours. The above-mentioned dispersant is castor oil or phosphoric acid ester, and the adhesive It is polyvinyl butyral, the plasticizer is a mixture of dibutyl phthalate and dioctyl phthalate, the weight ratio is 1:1, the solvent is absolute ethanol, and the leveling agent is cyclohexanone , (3) After ball milling, the casting slurry is vacuum stirred and defoamed for 10-30 minutes, the viscosity of the slurry is controlled to 10000-30000mPa.s, and then cast on a large casting machine, while drying at 60°C-100°C After 2-3 hours, a zirconia ceramic green body is prepared, and the cast green body is placed on a setter plate from room temperature to 600 °C at a heating rate of 0.5-1.5 °C / min, kept for 4 hours to remove the glue, and then Sintering at less than 1540°C for 2-4 hours.

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...

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 serious 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.