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

A ceramic green body, semi-water-based technology, applied in applications, household utensils, clay products, etc., can solve the problems of cracking and damage of green body, successful application of large-size ceramic parts, slowness, etc., to simplify the drying process and avoid easy drying Effects of cracking and surface force reduction

Active Publication Date: 2007-05-16
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 cause the green body to burst and damage during the drying and sintering process.
This is also one of the main obstacles to the successful application of water-based slurry injection gel molding technology in large-scale ceramic parts in recent years.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1, a large-sized 95% alumina ceramic green body is formed.

[0030] Weigh 1000g made of 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 methylenebisacrylamide Cross-linking agent, placed in a drum-type ball mill, add 1200g grinding balls at the same time, take out the slurry after mixing and grinding for 18 hours, after vibrating to remove air bubbles, add 2ml of tetramethylethylenediamine catalyst and 4ml of pre-configured 8% concentration The ammonium persulfate initiator aqueous solution is stirred evenly and poured into a Φ80×80mm nylon mold with a gate. After standing for 10 minutes, the slurry gelled. Take the gel body out of the mold, carve 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 volatilize ethy...

Embodiment 2

[0031] Example 2, precision molding of large-scale silicon nitride ceramic body.

[0032] Weigh 300g of silicon nitride powder with an average particle size of 1.4μm, add 80ml of deionized water, 4.5ml of polyammonium methacrylate dispersant, 9g of acrylamide organic monomer, and 0.5g of methylenebisacrylamide crosslinking agent , adjust slurry pH=9 with tetramethylammonium hydroxide, place in ball milling tank 1, add 500g balls at the same time, ball milling time is 10 hours; in addition, weigh 24g yttrium oxide and 24g lanthanum oxide powder, add 10ml ethyl Diol, 1ml polyammonium methacrylate dispersant, put into the ball mill tank 2, add 100g balls at the same time, ball mill for 10 hours. Then pour the slurry in the ball mill jar 2 into the ball mill jar 1 and continue mixing for 0.5 hour. At this time, the fluidity of the slurry is good. After taking it out, it is degassed by vacuum stirring. Add 2ml of ammonium sulfite reducing agent aqueous solution with a concentratio...

Embodiment 3

[0034] Example 3, precision molding of large-sized zirconia ball green 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 dispersant, and 5g of acrylamide organic monomer , 0.3g of methylenebisacrylamide cross-linking agent, adjust pH=10 with ammonia water. Place it in a drum-type ball mill and add 600g of balls at the same time. After ball milling for 15 hours, take out the slurry, add 0.5ml of tetramethylethylenediamine catalyst and 1ml of pre-configured 5% concentration of ammonium persulfate aqueous solution initiator after vacuum stirring and degassing, stir evenly, pour into steel with Place it in the Φ60mm spherical combination mold of gate and air outlet for 5 minutes, and the slurry will gel. Open the mold and take out the ceramic ball gel body, cut off the gate and air outlet, place i...

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PUM

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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 for ceramic bodies (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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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