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Method for precisely shaping non-water-base injection molding gel of ceramic body

A ceramic body and precision molding technology, applied in the field of inorganic non-metallic materials, can solve the problems of difficulty in preparing high solid phase content and fluidity ceramic slurry, limited application range, and difficulty in elimination, so as to avoid deformation and cracking, The shrinkage and deformation of the green body are small, and the effect of expanding the scope of use

Active Publication Date: 2013-02-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These solvents and polymer systems have high viscosities, and it is difficult to prepare ceramic slurry with high solid content and good fluidity. In addition, the price is high, and it is also difficult to exclude, which limits the scope of application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1. MgO ceramic green body molding

[0023] Weigh 1000g of magnesia ceramic powder with a median diameter of 0.2μm, add 500ml of ethylene glycol, and add 20ml of commercially available JA281 dispersant, 50g of acrylamide organic monomer, 2.5g of N'N-methylenebisacrylamide The coupling agent is placed in a drum-type ball mill, and 1500g of balls are added at the same time, and the slurry is taken out after 18 hours of mixed grinding. After vacuum stirring and degassing, the fluidity of the slurry is good. Add the pre-configured 5% ammonium persulfate ethylene glycol solution initiator, stir evenly, and pour it into a Φ22mm×80mm metal mold. Heating in an oven at 60° C. for 30 minutes, the slurry gelled. After taking it out, demould it at room temperature, take the gel body out of the mold, place it in an oven, and raise the temperature from 40°C to 20°C per hour until it reaches 200°C, and keep warm for 3 hours to evaporate the ethylene glycol. Sinter in an ai...

Embodiment 2

[0024] Embodiment 2. The precise molding of magnesium oxide / barium strontium titanate ceramic substrate green body

[0025] Weigh 120g of magnesium oxide powder with an average particle size of 0.2um and 80g of strontium barium titanate superfine powder with an average particle size of 0.5um, add 100ml of ethylene glycol, 20ml of glycerol, 10ml of absolute ethanol, and 4ml of commercially available JA-281 dispersant, 6g of acrylamide organic monomer, 0.3g of methylene bisacrylamide crosslinking agent, placed in a planetary ball mill, at the same time add 500g of grinding balls, take out the slurry after ball milling for 4 hours, and vibrate to remove air bubbles Add 0.4ml tetramethylethylenediamine catalyst and 0.5ml pre-configured 5% concentration ammonium persulfate aqueous solution initiator, stir evenly, pour into a mold with a gap of 1.2mm formed by flat glass, place for 8 minutes, The slurry gelled. Open the mold and take off the gel ceramic blank, put it between the gy...

Embodiment 3

[0026] Embodiment 3. Precision molding of aluminum nitride ceramic substrate green body

[0027]Weigh 360g of aluminum nitride powder with an average particle size of 3.0μm, 20g of yttrium oxide and 20g of calcium fluoride powder, add 100ml of ethylene glycol and 1,3-butanediol, 1,4-butanediol, isopropyl 10ml of each alcohol, add 20ml of commercially available JA281 dispersant, 10g of acrylamide monomer, 0.5g of ammonium methylenebisacrylate crosslinking agent, add 1000g of grinding balls, place in a planetary mill for ball milling for 12 hours, and then take out the slurry After vacuum stirring and degassing, add 3ml tetramethylethylenediamine catalyst and 2ml ammonium persulfate ethylene glycol solution initiator with a concentration of 10%, stir evenly, and pour them into steel cylindrical molds of Φ20mm×80mm respectively , placed for 15 minutes, the slurry gelled. The gel body was taken out from the mould, and a body with a smooth surface and no oxygen-inhibited polymeriz...

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Abstract

The invention belongs to the field of inorganic nonmetallic materials, relating to a method for precisely shaping the non-water-base injection molding gel of a ceramic body. The method comprises the following steps of: mixing one or more of anhydrous alcohol organic solvents with low viscosity to serve as a solvent; adding ceramic powder, an organic monomer and a cross linking agent, wherein the organic monomer and the cross linking agent can be dissolved in a solvent system; after mixed milling, obtaining the non-water-base ceramic slurry with high ceramic powder volume weight and good flowability; adding a proper quantity of initiator; pouring the initiator into a die after the initiator is evenly mixed with the mixture; solidifying slurry gel in the presence of a catalyst or reducing agent or under the heating condition so as to precisely shape the non-water-base ceramic solvent; removing glue and sintering for the obtained blank to obtain the required ceramic. Because of adopting the non-aqueous solvent in the process, the method can be suitable for precisely shaping the gel of the easily-hydrolytic ceramic powder raw material, and the danger that the large-size ceramic blank is easy to deform and crack in the drying process can be avoided.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a non-water-based injection molding gel precision forming method of a ceramic body. Background technique [0002] In the early 1990s, the Oak Ridge State Key Laboratory of the United States successively invented "Organic Slurry Injection Molding Gel Molding Technology for Ceramic Body" (U.S 4894194,) and "Water-based Slurry Injection Molding Gel Molding Technology". "(U.S. 5028362,). 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/14
Inventor 焦春荣陈大明仝建峰梁艳媛李宝伟黄浩
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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