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Novel vacuum degassing method for gelcasting ceramic slurry

A technology of gel injection molding and ceramic slurry, which is applied to clay products, other household appliances, household appliances, etc., can solve the problems of oxygen consumption and incomplete removal of slurry bubbles, so as to ensure smooth curing and operation. effect of time

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the vacuuming time is long, all the oxygen will be easily consumed, so that the slurry will be solidified in advance during the vacuum degassing process; if the vacuuming time is too short, the air bubbles in the slurry will not be completely removed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Commercially available TiO 2 As a raw material, it is prepared into a 50vol% slurry. Take 0.125g of phenothiazine, 0.345g of catechol, dissolve in 100ml of ethanol to make a polymerization inhibitor. Get 100ml slurry, add 0.14mmol ammonium persulfate, 2mmol N, N, N', N'-tetramethylethylenediamine under stirring condition. The slurry was solidified after being vacuumed and degassed for 10 minutes at an ambient temperature of 30°C. Get 100ml slurry again, add 0.14mmol ammonium persulfate, 2mmol N, N, N', N'-tetramethylethylenediamine and 100 μl inhibitor under stirring condition. After vacuuming and degassing at an ambient temperature of 30°C for 10 minutes, the fluidity of the slurry was good and the curing time after injection molding was basically unchanged.

Embodiment 2

[0019] Commercially available Al 2 o 3 As a raw material, it is prepared into a 55vol% slurry. Take 0.125g of phenothiazine, 0.345g of catechol, dissolve in 100ml of ethanol to make a polymerization inhibitor. Get 100ml slurry, add 0.25mmol potassium persulfate, 3mmol N, N, N', N'-tetramethylethylenediamine under stirring condition. The slurry was solidified after being vacuumed and degassed for 15 minutes at an ambient temperature of 30°C. Get 100ml slurry again, add 0.25mmol potassium persulfate, 3mmol N, N, N', N'-tetramethylethylenediamine and 200 μl inhibitor under stirring condition. After vacuuming and degassing at an ambient temperature of 30°C for 10 minutes, the fluidity of the slurry was good and the curing time after injection molding was basically unchanged.

Embodiment 3

[0021] Commercially available Al 2 o 3 As a raw material, it is prepared into a 55vol% slurry. Take 0.125g of phenothiazine, 0.345g of catechol, dissolve in 100ml of ethanol to make a polymerization inhibitor. Get 100ml slurry, add 0.25mmol hydrogen peroxide, 3mmol N, N, N', N'-tetramethylethylenediamine under stirring condition. The slurry was solidified after being vacuumed and degassed for 15 minutes at an ambient temperature of 30°C. Get 100ml slurry again, add 0.25mmol hydrogen peroxide, 3mmol N, N, N', N'-tetramethylethylenediamine and 200 μl inhibitor under stirring condition. After vacuuming and degassing at an ambient temperature of 30°C for 10 minutes, the fluidity of the slurry was good and the curing time after injection molding was basically unchanged.

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PUM

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Abstract

The present invention discloses vacuum bubble-eliminating method for injected ceramic slurry via adding polymerization retarder to ensure no curing during vacuum pumping, and belongs to the field of ceramic forming technology. Into slurry, initiator, catalyst and polymerization retarder comprising phenothiazine and catechol are added through stirring; and the slurry is then pumped to eliminate bubble for 10-15 min to obtain slurry with excellent flowability and no bubble for injection directly. Adding polymerization retarder in certain amount can delay the cure of the slurry to ensure vacuum deairing effect without affecting the normal curing of the slurry in subsequent step.

Description

technical field [0001] The invention belongs to the ceramic molding technology, and particularly relates to a new method for removing air bubbles in a gel injection molded ceramic slurry by adding a polymerization inhibitor to ensure that the slurry will not solidify during vacuuming. Background technique [0002] The preparation process of high-performance ceramic materials and components is the premise of the development and application of ceramic materials. The molding process plays a connecting role in the entire preparation process of ceramic materials. It is the key to ensuring the reliability, yield and repeatability of ceramic materials and components, and is directly related to industrialization and large-scale production. After entering the 1990s, focusing on improving the uniformity of the ceramic body and solving the reliability of ceramic materials, the colloidal in-situ solidification molding process came into being and became a research hotspot. Gelcasting, te...

Claims

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Application Information

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IPC IPC(8): C04B33/28
Inventor 杨金龙戴春雷黄勇
Owner TSINGHUA UNIV
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