Method of starch in situ coagulation colloidal shaping oxide ceramic

A technology of oxide ceramics and solidified glue is applied in the field of ceramic molding to achieve the effects of low cost and easy availability, compatibility with the environment, low cost and high reliability

Inactive Publication Date: 2004-12-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are no reports at home and abroad on the direct use of starc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Get 1 gram of dispersant 9020 (polyacrylic acid ammonium salt) and dissolve it in 180 grams of water, and dissolve 1000 grams of Al 2 o 3 The fine powder is gradually dispersed in water containing dispersant, Al 2 o 3 The particle size of the micropowder is 2.4 microns, adjust the pH value with HCl and NaOH to keep the pH value of the slurry at 7.5, and after ball milling and mixing for 6 hours, an Al with a volume fraction of 58% is obtained 2 o 3 slurry. Get 5 grams of tapioca starch (moisture content is 15.3%) and disperse into Al 2 o 3 In the slurry, and kept stirring for 3h. The prepared starch-Al 2 o 3 The ceramic slurry was poured into a non-porous mold after shaking and vacuuming for 0.8h, and kept at 80°C for 1h to shrink the green body until it could be demolded. After demoulding, the green body was dried at 120°C for 24 hours, and the linear shrinkage rate of the green body was measured to be 0.86%, and the dry green body density was 2.4g / cm 3 , The...

Embodiment 2

[0023] Take 10 grams of dispersant 9020 and dissolve it in 1800 grams of water, and stir 8000 grams of Al 2 o 3 The fine powder is gradually dispersed in water containing dispersant, Al 2 o 3 The particle size is 0.8 microns, and the pH value is adjusted with HCl and NaOH to keep the pH value of the slurry at 8. After mixing and ball milling for 10 hours, a volume fraction of 53% Al 2 o 3 slurry. Get 95 grams of waxy corn starch (moisture content is 15.0%) and disperse into Al 2 o 3 In the slurry, and kept stirring for 5h. The prepared starch-Al 2 o3 The ceramic slurry was poured into a non-porous mold by shaking, vacuuming and defoaming for 1 hour, and kept at 80°C for 2.5 hours to shrink the green body until it could be demolded. After demoulding, the green body was dried at 120°C for 24 hours, and the linear shrinkage rate of the green body was measured to be 1.83%, and the dry green body density was 2.23g / cm 3 , The dry billet strength is 3.4MPa.

Embodiment 3

[0025] Get 0.6 grams of dispersant 9020 and dissolve it in 100 grams of water, and stir 390 grams of Al 2 o 3 micronized powder and 145 g ZrO 2 The fine powder is gradually dispersed in water containing dispersant, Al 2 o 3 The particle size is 1.2 microns, ZrO 2 The particle size is 0.7 microns, and the pH value is adjusted with HCl and NaOH to keep the pH value of the slurry at 9.0. After mixing and ball milling for 6 hours, a volume fraction of 55% Al 2 o 3 base composite ceramic slurry. 2 g of esterified starch (with a water content of 13.6%) was dispersed into the ceramic slurry and stirred continuously for 4.5 h. The prepared starch-ceramic slurry was poured into a non-porous mold after shaking and vacuuming for 2 hours, and kept at 80°C for 1.5 hours to shrink the green body until it could be demolded. The green body after demoulding was dried at 120°C for 24 hours, the measured linear shrinkage rate of the green body was 1.28%, and the dry green body density was...

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Abstract

A process for shaping the raw oxide ceramics by in-situ solidification of starch includes dispersing the powder of oxide ceramics (Al2O3 ceramics, ZrO2 ceramics, Al2O3 -base ceramics, etc) in the water containing disperser, ball grinding, adding starch or modified starch, stirring, removing foams, pouring it in mould, keeping the temp for a certain time, and demoulding.

Description

technical field [0001] The invention relates to a molding method of ceramics, in particular to a method for in-situ solidification of starch to form oxide ceramics in a colloidal state. Background technique [0002] In the ceramic molding process, in-situ solidification colloidal molding technology has many advantages: (1) It is easier to control the agglomeration and impurities between powder materials in the green body, reduce internal defects, and realize the molding of various special-shaped complex ceramic parts; ( 2) The solid content of the slurry is high, so the density of the green body is high; (3) The content of organic matter in the green body is low, which overcomes the shortcomings of injection molding green bodies that are easy to cause defects and collapse due to debinding, and can form ceramic parts with thin-walled structures (4) By adjusting the process parameters, it is possible to adjust and control the molding time, the time for the elimination of organ...

Claims

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Application Information

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IPC IPC(8): C04B33/28C04B35/624C04B35/63C04B35/636
Inventor 陈玲宋贤良叶建东李琳胡松青李冰
Owner SOUTH CHINA UNIV OF TECH
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