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Method for rapidly curing ceramic slurry

A ceramic slurry and rapid curing technology, which is applied in the field of inorganic non-metallic ceramic curing, can solve the problems of poor uniformity, long curing time, and low molding efficiency, and achieve less curing agent consumption, short curing time, and uniformity Good results

Inactive Publication Date: 2017-01-25
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the present invention provides a method for rapidly solidifying ceramic slurry, which increases the ionic strength and ester pH in the ceramic slurry by decomposing and releasing high-valent metal cations through temperature control The decomposition of the regulator makes the pH value of the ceramic slurry close to the isoelectric point, and realizes the rapid solidification of the ceramic slurry to solve the problem of long curing time, high curing temperature, and low Problems such as poor uniformity and low molding efficiency

Method used

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  • Method for rapidly curing ceramic slurry
  • Method for rapidly curing ceramic slurry
  • Method for rapidly curing ceramic slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 6.5g / L calcium iodate, 2.0vol% glyceryl diacetate solidified 2.0wt% tetramethylammonium hydroxide dispersed 50vol% SiO 2 slurry.

[0044] 100 grams of silica powder, 2.0 grams of tetramethylammonium hydroxide and 37.7 grams of water were mixed, and ball milled for 1.5 hours at a ball milling rate of 250 r / min to prepare a negatively charged particle surface with a solid phase volume fraction of 50%. Ceramic slurry, then add 0.54g of calcium iodate, mix and mill at a ball milling rate of 250r / min for 8 minutes, stir and degas under vacuum for 15 minutes, then add 1.66ml of glyceryl diacetate, and stir with a glass rod for 30 seconds After injection molding, place at 60°C for 20 minutes before demoulding, dry at 80°C for 12 hours, then heat up to 1250°C at a heating rate of 3°C / min for 3 hours and sinter. The relative theoretical density of the obtained ceramic dry body is 60.0%, and the shrinkage rate is 2.8%; the relative theoretical density of the obtained ceramic sin...

Embodiment 2

[0046] 7.5g / L calcium iodate, 1.5vol% triacetin solidified 0.5wt% ammonium citrate dispersed 60vol% Al 2 o 3 slurry.

[0047] Mix 100 grams of alumina powder, 0.5 grams of ammonium citrate and 16.7 grams of water, and mill at a ball milling speed of 200 r / min for 2 hours to prepare a negatively charged ceramic slurry with a solid phase volume fraction of 60%. Then add 0.6 g of calcium iodate, mix and ball mill for 10 minutes at a ball milling rate of 200 r / min, then stir and degas under vacuum for 10 minutes. Then add 1.2 ml triacetin, stir with a glass rod for 15 seconds and then inject into the mold. After being placed at 50°C for 30 minutes, it was removed from the mold, dried at 70°C for 24 hours, and then heated to 1550°C at a heating rate of 5°C / min for 2 hours for sintering. The relative theoretical density of the obtained ceramic dry body is 61.8%, and the shrinkage rate is 2.5%; the relative theoretical density of the obtained ceramic sintered part is 99.5%, and th...

Embodiment 3

[0049] 6.0g / L nickel iodate, 2.5vol% ethyl acetate curing 2.5wt% ammonium polyacrylate dispersed 55vol% SnO 2 slurry.

[0050] Mix 100 grams of tin oxide powder, 2.5 grams of ammonium polyacrylate and 16.7 grams of water, and mill at a ball milling rate of 150 r / min for 3 hours to prepare a negatively charged ceramic slurry with a solid phase volume fraction of 55%. Then add 0.50 g of nickel iodate, mix and ball mill for 10 minutes at a ball milling rate of 150 r / min, and then stir and degas under vacuum for 20 minutes. Then add 2.1 ml of ethyl acetate, stir the glass rod for 10 seconds, and inject it into the mold. After being placed at 45°C for 45 minutes, the mold was removed, dried at 80°C for 24 hours, and then heated to 1500°C at a heating rate of 10°C / min for 4 hours for sintering. The relative theoretical density of the obtained ceramic dry body is 62.3%, and the shrinkage rate is 2.6%; the relative theoretical density of the obtained ceramic sintered part is 99.6%, ...

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Abstract

The invention discloses a method for rapidly curing ceramic slurry. The method comprises the following steps: firstly, mixing ceramic powder, a dispersant and water and sufficiently carrying out ball milling to prepare the ceramic slurry with a negatively-charged particle surface; then, adding iodate of high-valence metal cations and carrying out the ball milling; stirring the obtained slurry under a vacuum condition and degassing; then adding an esters pH (Potential of Hydrogen) regulator; after uniformly stirring, injecting the slurry into a pore-free mold; storing the pore-free mold at 45 DEG C to 70 DEG C for 15 minutes to 45 minutes; de-molding to obtain a ceramic wet blank; drying the ceramic wet blank to obtain a dry blank; then putting the dry blank into a sintering furnace and sintering to obtain a sintered ceramic body. According to the method provided by the invention, the common effect of decomposing the iodate through temperature control to release the high-valence metal cations and decomposing and regulating the pH value to an isoelectric point through the esters pH regulator realizes rapid curing and molding of the ceramic slurry; the method has the advantages that the method is suitable for any ceramic slurry with negative charges, is rapid in curing speed, high in slurry molding efficiency, environment-friendly, excellent in performance and simple to operate, is convenient for large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of solidification methods for inorganic non-metallic ceramics, and more specifically relates to a method for rapidly solidifying ceramic slurry. Background technique [0002] The direct coagulation injection molding process (Direct Coagulation Casting, DCC) uses biological enzymes or self-catalyzed reactions to cause chemical reactions inside the slurry to increase the salt ion strength in the slurry or adjust the pH value of the slurry to the isoelectric point. Realize the curing of the ceramic slurry. Among them, the method of increasing the ionic strength has a long curing time (1 to 3 days) and the wet ceramic billet is prone to cracks, thereby affecting the performance of the ceramics; although the method of adjusting the pH value to the isoelectric point can prepare ceramics with good performance, but The strength of the ceramic green body is too low, which is inconvenient for demoulding and post-proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/10C04B35/457C04B35/632C04B35/634C04B35/63C04B35/64
CPCC04B35/10C04B35/14C04B35/457C04B35/6303C04B35/632C04B35/63404C04B35/64C04B2235/6022C04B2235/6562C04B2235/6567C04B2235/77
Inventor 吴甲民陈安南刘梦月陈敬炎史玉升李晨辉张启富贺智勇
Owner HUAZHONG UNIV OF SCI & TECH
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