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Method for preventing oxygen inhibition in injection moulding process

A molding process and oxygen inhibition technology, which is applied in the field of ceramic material preparation technology, can solve the difficulties in preparing water-based ceramic slurry with high solid content and good fluidity, increase the complexity of the preparation process, increase the preparation cost and other problems, and achieve Consistent surface and internal structure performance, low cost, simple and easy operation

Active Publication Date: 2011-05-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former method not only increases the preparation cost, but also has complex processes and harsh conditions. The latter method will inevitably change the characteristics of the slurry due to the addition of water-soluble polymers to the slurry, which will greatly increase the viscosity of the slurry. Difficulties in formulating water-based ceramic slurry with high solid content and good fluidity, which increases the complexity of the preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Forming of zirconia ceramic cylinder green body

[0043] Weigh 500g of partially stabilized zirconia ceramic powder with an average particle size of 0.5μm, add 60ml of deionized water, 12ml of acrylic acid and methacrylic acid amine copolymer dispersant, 13g of acrylic amine organic monomer, 1g of methylenebispropylene Amide cross-linking agent, adjust pH=9 with ammonia water. Add 750g of grinding balls, place in a drum mill and mill for 18 hours and take out the slurry, add 0.8ml of tetramethylethylenediamine catalyst and 1.0ml of ammonium persulfate aqueous solution initiator with a concentration of 7% after vacuum stirring and degassing Evenly, pour into a steel cylindrical mold with a size of Φ60mm×43mm and leave a mold space with a height of 3mm, then add glycerol to cover the surface slurry, the thickness of glycerol is 1.5mm, and place it at room temperature for 10 Minutes, the slurry gelled. Pour off the glycerol on the surface, open the mold, pl...

Embodiment 2

[0044] Embodiment 2: Forming of 96% alumina ceramic green body

[0045] Weigh 2000g by α-Al 2 o 3 , 96% alumina ceramic powder composed of kaolin, talc and calcium carbonate, add 280ml deionized water, 50g acrylamide monomer, 3.0g ammonium methylene bisacrylate crosslinking agent, 20ml ethylene glycol, 30ml ammonium acrylate dispersant , add 3000g grinding ball simultaneously, place in the drum type ball mill, take out slurry after mixing mill 22 hours, add 3ml tetramethylethylenediamine catalyst and 4ml concentration after adding 3ml tetramethylethylenediamine catalyst and 4ml concentration and be 5% ammonium persulfate initiator aqueous solution, Stir evenly, add to a glass plate mold of 300mm×250mm×10mm, then add ethylene glycol with a thickness of 2mm on the surface of the slurry on the side of the mold opening, and place it at room temperature for 15 minutes until the slurry gels. Pour out the ethylene glycol on the surface, and after the mold is opened, a green body wi...

Embodiment 3

[0046] Embodiment 3: Forming of silicon nitride ceramic cylindrical green body

[0047]Weigh 200g of silicon nitride powder with an average particle size of 1.0μm, 15g of yttrium oxide and 15g of lanthanum oxide powder, add 40ml of deionized water, 3ml of polyammonium methacrylate dispersant, 6g of acrylamide monomer, and 0.6g of methylene ammonium bisacrylate cross-linking agent, adjust the pH of the slurry to 10 with tetramethylammonium hydroxide, add 250g of balls, place it in a planetary mill for ball milling for 4 hours, take out the slurry, and add it after vacuum stirring and degassing 1.5ml tetramethylethylenediamine catalyst and 2ml ammonium persulfate aqueous solution initiator with a concentration of 8%, stir evenly, then divide the slurry into two parts equally, and pour them into steel cylindrical molds of Φ20mm×80mm respectively And leave a mold space with a height of 3ml, cover the surface with 1,4 butanediol and 1,3 butanediol respectively, and leave it for 15 ...

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Abstract

The invention belongs to the technical field of the preparation of the ceramic material and relates to a method for preventing oxygen inhibition in the gel injection moulding process. The invention provides a method which can be operated under air condition and prevent the oxygen inhibition of slurry in the gel injection moulding process. In the method in the invention, a layer of alcohol type organic solvent which can not affect the gelation of slurry is covered on the surface of the part of slurry contacting with the air before the gelation so as to separate slurry and air; and the organic solvent on the surface is poured away after the gelation of slurry, thus complete gel can be obtained without any surface treatment. The technology comprises the following steps: proportioning, mixingthrough ball milling, defoaming, adding catalyst and initiator, pouring, covering a layer of alcohol type antioxidation polymerization inhibitor on the surface of slurry, performing gelation, pouringaway the antioxidation polymerization inhibitor on the surface, demoulding and drying. The method in the invention is convenient to operate, is simple and practical, and can be used to effectively solve the oxygen inhibition problem in the gel injection moulding process of ceramic slurry and obtain a ceramic blank with bright surface and fully consistent internal structure.

Description

technical field [0001] The invention belongs to the field of preparation technology of ceramic materials, and relates to a method for preventing oxygen inhibition in the gel forming process of injection molding. Background technique [0002] In the early 1990s, the Oak Ridge State Key Laboratory of the United States invented the gel injection molding technology of the ceramic body. This technology combines the traditional organic body grouting molding technology with the theory of polymer chemistry. The organic monomers and crosslinking agents that form the gel are prepared with organic solvents or water to form a premixed solution, mixed with ceramic powder to form a ceramic slurry, poured into a non-permeable mold and made in situ under certain conditions It can be polymerized to form a gel body with a cross-bond structure to shape the ceramic body, so it can be applied to the precision molding of various complex shapes of ceramic bodies. However, as a free radical polyme...

Claims

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Application Information

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IPC IPC(8): C04B35/624
Inventor 梁艳媛陈大明仝建峰李宝伟焦春荣
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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