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Preparation method of freeze-cast Y-TZP slurry

A freezing molding and slurry technology, applied in the field of ceramic preparation, can solve the problems of low strength, long grouting time, and poor uniformity of the green body, and achieve high quality molding, simple preparation process, and reduced usage. Effect

Inactive Publication Date: 2016-11-09
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wet molding also has various limitations, such as long grouting time for ordinary grouting molding, high moisture content of the green body, poor uniformity, rough shape, large drying and firing shrinkage, low strength, and low production efficiency. ;Injection molding needs to add organic additives with a volume content of 45%-50%, and thermoplastic resin is used as a plastic carrier in the molding, and the content is relatively high. Before sintering, the green body must be degreased. Agglomeration and rearrangement of particles, etc., make the uniformity of the green body worse and easy to crack

Method used

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Examples

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Effect test

preparation example Construction

[0011] The present invention is a kind of Y-TZP slurry preparation method that is used for freezing forming, and its steps are:

[0012] (1) Using deionized water as a solvent, add freezing aid, dispersant and binder into deionized water, and stir for 10-20 minutes to obtain a mixed liquid; deionized water, freezing aid, and dispersant in the mixed liquid The mass ratio to the binder is 100: (1.0~2.5): (0.5~2.0): (0.4~1.0); the freezing aid is glycerol, dimethyl sulfoxide, triglycerol monostearin One or more mixtures of esters, ethylene glycol, gelatin peptide, propylene glycol; the dispersant is one of polyacrylic acid, polyammonium methacrylate, polyethylene glycol, and ammonium citrate or a mixture of several; the binder is one or a mixture of polyvinyl alcohol, polyacrylate polymer, methylcellulose, carrageenan;

[0013] (2) Add the mixed liquid obtained above into the ball milling tank, add the micron-sized Y-TZP powder into the mixed liquid in the ball milling tank in b...

Embodiment 1

[0022] Prepare 500ml of Y-TZP slurry for grouting and freeze molding, and select a volume solid content of 40vol%. First, take 300 g of deionized water, add 18 g of glycerol, 3 g of polyacrylic acid, and 30 g of 5% polyvinyl alcohol aqueous solution into the deionized water, and stir with an electric mechanical stirrer in a 500 ml beaker for 20 minutes to obtain a mixed liquid. Then measure 300ml of the mixed liquid and add it to the ball mill jar, weigh 1178g of Y-TZP powder with an average particle diameter of 2.8 μm, divide it into four parts (500g, 300g, 200g, 178g), and add the mixed liquid in the ball mill jar in batches In the process, each batch of newly added powder is carried out after the previous batch of powder is fully wetted. After all the powder is added, ball mill for 20 hours to obtain the Y-TZP slurry. After 10 minutes of vacuum degassing, the slurry was injected into a molding mold, and placed in a freezer at minus 25°C for 4 hours, the mold was opened to t...

Embodiment 2

[0024] Prepare 200ml of Y-TZP slurry for frozen extrusion 3D printing technology, and select a volume solid content of 44vol%. First weigh 120g of deionized water, add glycerol 6g, propylene glycol 3g, polyammonium methacrylate 1.5g, 5% polyvinyl alcohol aqueous solution 10g, 5% carrageenan aqueous solution 10g in the deionized water, put in a 200ml beaker Stir with a magnetic stirrer for 20 minutes to obtain a mixed liquid. Then measure described mixed liquid 112ml and add in the ball mill jar, take by weighing the Y-TZP powder 518g that average particle diameter is 2.8 μm, divide into three parts (250g, 150g, 118g), add in the mixed liquid in the ball mill jar in batches, Each batch of newly added powder is carried out after the previous batch of powder is fully wetted. After all the powder is added, ball mill for 20 hours. After ball milling, the pH value is adjusted to 6.0 with 5% dilute hydrochloric acid, and the Y-TZP slurry is obtained by vacuum degassing for 10 minutes...

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Abstract

A preparation method of freeze-cast Y-TZP slurry is disclosed. The slurry is composed of micron-size Y-TZP (tetragonal polycrystal zirconia with Y2O3 as a stabilizing agent) powder and a mixed liquid. The mass ratio of the Y-TZP powder to the mixed liquid is (320-600): 100. The mixed liquid is obtained by the following steps: using deionized water as a solvent, adding a freezing auxiliary agent which accounts for 1.0-2.5% of mass of deionized water, a dispersant which accounts for 0.5-2.0% of mass of deionized water and an organic binder which accounts for 0.4-1.0% of mass of deionized water, and mixing. By adding the Y-TZP powder into the mixed liquid in batches and ball-milling for 12-24 h, the slurry is then prepared. According to requirements of the forming process, viscosity of the slurry also can be further adjusted through pH value. The Y-TZP slurry is freeze-cast in a low-temperature environment, and can be used for extrusion freezing 3D printing technology and a slip-casting freezing forming technology.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, and relates to a slurry preparation technology for freezing and forming in a low-temperature environment. Background technique [0002] Y-TZP is Y 2 o 3 Tetragonal polycrystalline zirconia as a stabilizer, this material is composed of very fine zirconia grains, the sintering temperature is low, it has high melting point, high strength, high fracture toughness, high chemical stability, and good biological phase Capacitance and other advantages, widely used in aerospace, mechanical engineering, energy, electronic information, stomatology and other industries. [0003] Forming technology is the key technology for preparing Y-TZP parts, and the improvement of forming technology and process is of great significance to improve the manufacturing quality of parts and reduce the manufacturing cost. Various molding techniques of ceramics can be used in the molding of Y-TZP parts, which can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/632
CPCC04B35/48C04B35/632C04B2235/3225
Inventor 刘洪军李亚敏
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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