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Preparation method of ceramic slurry capable of high solid content and good fluidity

A technology of ceramic slurry and high solid content, applied in chemical instruments and methods, clay preparation equipment, mixing operation control, etc., can solve the problems of strong interaction between particles, large specific surface energy, difficult fluidity, etc., and achieve improved Reproducibility, improvement of fluidity, and effect of reducing viscosity

Inactive Publication Date: 2007-08-01
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ordinary powders, the traditional wet molding process can meet the requirements of ordinary ceramic material wet molding process for ceramic slurry to a certain extent by adding dispersants, but for the submicron and nanometer powder as the base material For the wet molding of high-tech ceramic materials, due to the small particle size of the ultrafine powder, large specific surface energy, and high surface activity, in the water medium, the highly active powder particles interact with water molecules, and a large amount of free water It is difficult to make the slurry maintain good fluidity while having a high solid phase volume fraction when converted into structural water, and when the solid phase volume fraction of the slurry is high, the distance between particles is small and the force between particles is strong , the particles are easy to agglomerate and lose the original unique properties of ultrafine particles
The surface modification of ultrafine powder is the main technical way for people to solve this problem at present, but the surface modification process is complex and technically difficult, thus restricting the wide application of ultrafine powder in the field of high-tech ceramic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0009] Take α-Al with an average particle size of 0.51 μm 2 o 3 160g of powder is placed in a round-bottomed flask; the mass ratio of alumina dry powder is 1.5%, and the ammonium polyacrylate (PAA-NH 4 ) Dispersant 2.40g, dispersant and 30ml of deionized water are mixed evenly, adjust the pH value to 4.5 with 0.5M HCl and heat to 85°C; pour the dispersant aqueous solution into the powder, stir and mix, Sonicate in a constant temperature water bath for 5 minutes, and continue to adsorb for 12 hours at 85°C under stirring to obtain a slurry. The solid content of the slurry, that is, the solid phase volume fraction is 57% vol, and its fluidity is measured with a rotational viscometer, and its apparent viscosity is 0.35 Pa.s; the slurry has the same solid phase volume fraction prepared at 20°C Compared with the slurry, its apparent viscosity decreased by 16% (20°C, η=0.42Pa.s).

example 2

[0011] Take α-Al 2 o 3 -ZrO 2 Composite powder 200g, in which α-Al 2 o 3 The content is 80%, α-Al 2 o 3 and ZrO 2 The average particle diameters are 0.51μm and 0.43μm respectively; measure 38ml of deionized water and 3.6g of PAA / PEO copolymer dispersant with a molecular weight of 12000-14000 and stir and mix, adjust the pH value to 3.5, and heat to 95°C; the aqueous solution of the dispersant Pour in the powder and stir to mix, ultrasonicate for 10 minutes in a constant temperature water bath at 95°C, and continue to absorb for 10 hours at 95°C under stirring to obtain a slurry. The solid content of the slurry, that is, the solid phase volume fraction, is 53% vol, and its fluidity is measured with a rotational viscometer, and its apparent viscosity is measured to be 0.39Pa.s; the slurry has the same solid phase volume fraction prepared at 20°C Compared with the slurry, its apparent viscosity decreased by about 22% (20°C, η=0.50Pa.s).

example 3

[0013] Weigh α-Al with an average particle size of 0.68 μm 2 o 3 Put 200g of powder in a round bottom flask; weigh 3.0g of PAA / PEO dispersant with a molecular weight of 12000-14000, accounting for 1.8% of the weight of the alumina dry powder, mix the dispersant with 32ml of deionized water, and adjust the pH value to 5.0 with , heated to 90°C; the dispersant aqueous solution was poured into the powder, fully stirred, ultrasonicated in a constant temperature water bath at 90°C for 6 minutes, and adsorbed at 90°C and stirred for 8 hours to obtain a slurry. The solid content of the slurry, that is, the solid phase volume fraction is 61% vol, and its fluidity is measured with a rotational viscometer, and its apparent viscosity is 0.78Pa.s, which is the same as that of the same solid phase volume fraction prepared at 20°C. Compared with the slurry, its apparent viscosity decreased by about 12% (20°C, η=0.89Pa.s).

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Abstract

The invention discloses a preparation method of ceramic slurry with high solid content and good mobility. First weighing certain quality alumina powder and putting in boiling flask with temperature control and stirring device; then weighing polyacrylic acid dispersant according 0.8 to 1.8% of dry powder quality, weighing deionized water according to the solid-phase volume percentage of actual needed prepared slurry and preparing dispersant water solution, adjusting the pH to 2.5~6.5, heating to 60 ~ 95 degree C; finally, mixing the dispersant water solution and the powder body, putting it in ultrasonic instrument 5 ~ 10 mins at constant temperature 60-95DEG C, adsorbing 2~12 hours in the constant temperature stirring status after ultrasound action then preparing the slurry product. The invention reduces the structural water of solid particles surface of slurry through heating, increases the free water amount in slurry, reduces the slurry viscosity, increases the chain segment density of dispersant through temperature, increases the repelling force position energy between particles to making the slurry keep uniform and stable performance while the flowability is increased.

Description

technical field [0001] The invention relates to a high-tech ceramic material wet processing technology, in particular to a preparation method of ceramic slurry with high solid content and good fluidity. Background technique [0002] Wet forming is a common forming method for high-tech ceramic materials. Wet forming is highly valued by material workers for its advantages of high green body density, small pores, narrow pore size distribution, and the ability to form ceramic devices with complex shapes in net dimensions. The requirements of wet molding process for ceramic slurry mainly include three aspects: first, high solid phase volume fraction φ > 50%, that is, high solid content, the higher the solid phase volume fraction, the greater the density of the green body after molding, and the green body The smaller the shrinkage after sintering, the better the effect of net size molding; the second is good fluidity, good fluidity of slurry, that is, low viscosity characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C1/04B28C1/06B28C7/04
Inventor 李登好朱晓文
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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