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Method for in-situ solidification of ceramic suspension by dispersant cross-linking, and ceramic molding method

A technology of dispersant and suspension is applied in the field of forming of dispersant cross-linking in-situ solidified ceramic suspension to improve the strength of green body, which can solve the problems of low strength, long curing time, unfavorable industrial production, etc. The effect of improving mechanical properties

Inactive Publication Date: 2019-09-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, in order to overcome the shortcomings of the existing direct solidification injection molding and ceramic dispersant reaction failure in-situ solidification injection molding methods, the strength of the ceramic body is low and the curing time is long, which is not conducive to industrial production. The present invention provides a dispersant Method for Improving Green Body Strength by Cross-linking and Solidifying Ceramic Suspension

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dimethyl sulfate was used as curing agent to solidify polyvinylpyrrolidone-dispersed alumina ceramic suspension in situ.

[0032] Mix 1.464 grams of polyvinylpyrrolidone, 488 grams of alumina and 100 grams of water, and ball mill for 24 hours to prepare alumina ceramic suspension with a solid phase volume fraction of 55%. Put the alumina ceramic suspension in a water bath at 40°C for 15 minutes, add 3 ml of dimethyl sulfate, stir in vacuum for 10 minutes to remove air bubbles, inject it into a plastic mold, and continue the water bath treatment at 70°C for 1 hour before demoulding to obtain The wet billet was dried at 100°C for 24 hours to obtain a dry billet, and the temperature was raised to 1550°C at a heating rate of 5°C per minute, and kept for 2 hours to obtain alumina ceramics. Among them, the compressive strength of the wet billet is 6.34±1.1MPa, the bending strength of the ceramic is 488±42MPa, and the Weber modulus is 22.

Embodiment 2

[0034] Diethyl sulfate was used as curing agent to solidify polyvinylpyrrolidone-dispersed zirconia ceramic suspension in situ.

[0035] Mix 1.22 grams of polyvinylpyrrolidone, 610 grams of zirconia and 100 grams of water, and ball mill for 24 hours to prepare a zirconia ceramic suspension with a solid phase volume fraction of 50%. Put the zirconia ceramic suspension in a water bath at 40°C for 15 minutes, add 4 ml of diethyl sulfate, inject it into a rubber mold, treat it in a water bath at 50°C for 2 hours, and then demould it to obtain a wet body, and dry it at 80°C The dry body was obtained in 48 hours, and the temperature was raised to 1450° C. at a heating rate of 7° C. per minute, and kept for 4 hours to obtain zirconia ceramics. Among them, the compressive strength of the wet billet is 6.9±0.9MPa, the bending strength of the ceramic is 920±90MPa, and the Weber modulus is 15.

Embodiment 3

[0037] Diisopropyl sulfate was used as curing agent to solidify polyvinylpyrrolidone-dispersed silica ceramic suspension in situ.

[0038]0.795 g of polyvinylpyrrolidone, 265 g of silicon oxide and 100 g of water were mixed and ball milled for 24 hours to prepare a zirconia ceramic suspension with a solid phase volume fraction of 50%. Put the silica ceramic suspension in a water bath at 40°C for 30 minutes, add 2 ml of diisopropyl sulfate, inject it into a rubber mold, treat it in a water bath at 60°C for 0.5 hours, and then demould to obtain a wet billet. Dry for 48 hours to obtain a dry body, raise the temperature to 1270°C at a heating rate of 7°C per minute, and keep the temperature for 4 hours to obtain silicon oxide ceramics. Among them, the compressive strength of the wet billet is 5.9±0.7MPa, the bending strength of the ceramic is 138±47MPa, and the Weber modulus is 17.

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Abstract

The invention discloses a method for in-situ solidification of a ceramic suspension by dispersant cross-linking, and a ceramic molding method, and belongs to the technical field of solidification of inorganic nonmetallic ceramic suspensions. The method realizes the in-situ solidification of the ceramic suspension through initiating a cross-linking reaction of a dispersant by adding a curing agent.Organic sulfonate and cellulose are used as the curing agent, and the curing agent initiate or directly participate in the cross-linking reaction of the dispersant under external controllable conditions to realize the in-situ solidification of the ceramic suspension; and a three-dimensional net structure is formed in a ceramic green body through the cross-linking of the dispersant, so the mechanical properties of the green body are effectively improved, the defect of low strength of the ceramic green body produced through direct solidification injection molding and dispersant reaction failureinjection molding is overcome, the green body can meet the later machining process, and the methods are suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of solidification of inorganic non-metallic ceramic suspensions, in particular to a molding method for crosslinking and in-situ solidification of ceramic suspensions by dispersants to improve the strength of green bodies. Background technique [0002] Dispersion removal coagulation casting (DRCC) is a new type of ceramic coagulation casting process proposed in recent years. The curing principle is: through external freely controllable conditions (such as temperature, pH value, pressure, etc.), using the reactivity of the dispersant, or the intrinsic physical properties, the dispersant in the suspension can react, hydrolyze, precipitate, etc. Lose the dispersion effect, reduce the electrostatic repulsion between ceramic particles, or desorb from the surface of ceramic particles, resulting in suspension instability and in-situ solidification. This method is applicable to both water-based and non-water-based c...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/634C04B35/48C04B35/14C04B35/584C04B35/58C04B35/565B28B1/14B28B13/06B28B11/24
CPCB28B1/14B28B11/243B28B13/06C04B35/10C04B35/14C04B35/48C04B35/565C04B35/58078C04B35/584C04B35/622C04B35/63408C04B2235/61C04B2235/96
Inventor 杨金龙干科盖艳娇刘静静鲁毓钜张笑妍席小庆任博
Owner TSINGHUA UNIV
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