Method for precission shaping ceramic blank by semi-water-base injection-moulding gel process

A ceramic body and precision molding technology, which is applied in applications, household utensils, clay products, etc., can solve the problems that it is difficult to ensure that the body is fully dehydrated, the successful application of large-size ceramic parts, and the body is swollen and damaged, so as to avoid Easy to crack, cheap raw material, shrinkage reduction effect

Active Publication Date: 2006-05-24
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has shown that this process is quite slow, and it is still difficult to ensure that the moisture inside the green body is fully released when the volume weight of the green body is relatively large or the ceramic powder is low, which will c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] In Example 1, a large 95% alumina ceramic body was formed.

[0030] Weigh 1000g from α-Al 2 O 3, 95% alumina ceramic powder composed of kaolin and calcium carbonate, add 100ml deionized water, 40ml ethylene glycol, 10ml ethanol, 10ml ammonium polyacrylate dispersant, 1.5g acrylamide organic monomer, 25g methylene bisacrylamide The cross-linking agent is placed in a roller ball mill, and 1200g grinding balls are added at the same time. After 18 hours of mixing and grinding, the slurry is taken out. After vibration to remove air bubbles, 2ml of tetramethylethylenediamine catalyst and 4ml of pre-configured 8% concentration are added. The aqueous solution of ammonium persulfate initiator is stirred evenly and poured into a Φ80×80mm nylon mold with a gate. Leave it for 10 minutes, and the slurry will gel. Take the gel body out of the mold, cut off the gate with a knife, dry it under natural air conditions for 24 hours, and then place it in an oven at 200°C for 8 hours to evapora...

Example Embodiment

[0031] Embodiment 2, precision molding of large-size silicon nitride ceramic body.

[0032] Weigh 300g of silicon nitride powder with an average particle size of 1.4um, add 80ml of deionized water, 4.5ml of polyammonium methacrylate dispersant, 9g of acrylamide organic monomer, and 0.5g of methylenebisacrylamide crosslinker , Adjust the slurry pH=9 with tetramethylammonium hydroxide, put it in the ball mill tank 1, add 500g grinding balls at the same time, the ball milling time is 10 hours; also weigh 24g yttrium oxide and 24g lanthanum oxide powder, add 10ml ethylene Alcohol, 1ml polyammonium methacrylate dispersant, put it into the ball mill tank 2, and at the same time add 100g of the grinding balls, and ball mill for 10 hours. Then pour the slurry in the ball mill tank 2 into the ball mill tank 1, and continue mixing for 0.5 hours. At this time, the fluidity of the slurry is good. After taking it out, vacuum stirring and degassing, add 2ml of pre-configured 20% concentration o...

Example Embodiment

[0034] Example 3, precision molding of a large-size zirconia ball body.

[0035] Weigh 200g of partially stabilized zirconia ceramic powder with an average particle size of 1.8um, add 12ml of deionized water, 8ml of ethylene glycol, 1ml of methanol, 3ml of acrylic acid and methacrylic acid copolymer dispersion, and 5g of acrylamide organic monomer , 0.3g methylene bisacrylamide crosslinking agent, adjust pH=10 with ammonia water. Put it in a drum-type ball mill, and add 600g grinding balls at the same time. After ball milling for 15 hours, the slurry was taken out. After vacuum stirring and degassing, 0.5ml of tetramethylethylenediamine catalyst and 1ml of pre-configured 5% concentration ammonium persulfate aqueous solution initiator were added, stirred evenly, and poured into the steel belt. In the Φ60mm spherical combined mold with the gate and the vent hole, leave it for 5 minutes, and the slurry will gel. Open the mold and take out the ceramic ball gel body, cut off the gate a...

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Abstract

The invention belongs to the field of inorganic material, relating to the improvement of a ceramic blank precision molding technique. The steps of the invention includes: mixing, blending and ball-milling, eliminating gas, adding in catalyst or reducing agent, adding in initiator, injection molding and gelating, and demolding and drying. The invention uses less water, thoroughly eliminates organic matter, reduces the blank shrinkage and avoids larger-sized ceramic blanks from cracking in the drying course. Besides, the gelated blanks have better machining property before glycol, glycerine, and other solvents are eliminated.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and relates to an improvement of a precision forming technology of a ceramic green body. Background technique [0002] In the early 1990s, the Oak Ridge State Key Laboratory of the United States successively invented the organic slurry injection gel molding technology (U.S Patent 4894194, 1990) and the water-based slurry injection gel molding technology ( U.S. Patent 5028362, 1991). This technology combines the traditional ceramic body grouting molding technology with the theory of polymer chemistry. The organic monomer and crosslinking agent that can form a gel are prepared with an organic solvent or water to form a premixed liquid, which is mixed with ceramic powder. It is formulated into a ceramic slurry, poured into a non-leakage mold and polymerized in situ under certain conditions to form a gel with a cross-bond structure to shape the ceramic body, so it can be applied to ceramics of var...

Claims

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Application Information

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IPC IPC(8): C04B33/28C04B35/624C04B35/63
Inventor 陈大明刘晓光仝建峰李宝伟
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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