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Microwave curing process for ceramic material gel casting

A technology of gel injection molding and microwave curing, which is applied in the field of forming inorganic non-metallic materials, can solve problems such as rare reports, and achieve the effects of uniform microstructure, high performance, and shortened time

Inactive Publication Date: 2010-03-10
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, until now, there have been few reports on gelcasting of ceramic materials using microwave treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 3.4g of acrylamide, 0.2g of N,N'-methylenebisacrylamide, and 0.34g of polyammonium methacrylate in 20mL of distilled water once to prepare the pre-preparation liquid, adjust the pH value of the pre-preparation liquid to 10.5 with ammonia water, Add 113g of zirconia powder and stir vigorously for 1 hour to obtain a uniform slurry; then add 0.2mL of 10% ammonium persulfate aqueous solution and 0.2ml of 50% tetramethylethylenediamine aqueous solution to mix; after stirring evenly Vacuum degassing for 15 minutes, inject the slurry into the polytetrafluoroethylene mold; put the mold containing the slurry into a microwave oven at a power of 140 watts, and use continuous heating for 120 seconds to cure and form; inject the gel The molded ceramic green body was dried at 55° C. and relative humidity of 60% for 10 hours, and the bending strength of the ceramic green body reached 30.5 MPa, and then sintered at 1450° C. for 2 hours.

Embodiment 2

[0020] Dissolve 3.4g of acrylamide, 0.2g of N,N'-methylenebisacrylamide, and 0.34g of polyammonium methacrylate in 20mL of distilled water once to prepare the pre-preparation solution; adjust the pH value of the pre-preparation solution to 10.5 with ammonia water; Add 113g of zirconia powder and stir vigorously for 1 hour to obtain a uniform slurry; then add 0.2ml of 10% ammonium persulfate aqueous solution and 0.2ml of 50% tetramethylethylenediamine aqueous solution to mix; after stirring evenly Vacuum degassing for 15 minutes, grouting into the mold; put the mold with the slurry into the microwave oven at medium and high output power (280 watts, 420 watts and 560 watts), use intermittent heating, and stop for 5 seconds every 5 seconds Microwave treatment was carried out in 25 seconds, 20 seconds, and 15 seconds respectively; the ceramic green body obtained by gel injection molding was dried for 12 hours at 55°C and a relative humidity of 70%, and the bending strength of the c...

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Abstract

The invention relates to a microwave curing process for ceramic material gel casting, which comprises the following steps: firstly, dissolving organic monomer and crosslinker in sequence in the solvent, adding a dispersant and obtaining pre-prepared liquid; adjusting the pH value of the pre-prepared liquid to be 7-11, adding ceramic powder to the pre-prepared liquid, stirring the mixture stronglyand mechanically for 1h and obtaining even slurry; adding an initiating agent and a catalytic agent to the slurry and mixing evenly; soon afterward, removing the gas in the slurry by vacuum; casting the slurry into a module; placing the module packed with the slurry in a microwave oven for a curing process, and obtaining a gel casting ceramic body; and drying the ceramic body, and then sintering at the temperature of 1200 DEG C-2200 DEG C for 1-6h, and finally obtaining a ceramic product. Compared with the conventional gel casting curing method, the microwave curing process has the advantagesthat the process has fast heating speed and uniform temperature field, reduces the activation energy of reaction, accelerates the reaction rate, causes the polymerization reaction to be finished rapidly and achieves the purpose of high speed and high quality moulding of materials.

Description

technical field [0001] The invention relates to a microwave solidification process for gel injection molding of ceramic materials, belonging to the technical field of inorganic non-metallic material molding. Background technique [0002] Ceramic materials have been widely used in electronics, machinery, national defense and other industrial fields due to their unique properties. However, ceramic materials are difficult to machine after sintering, so people have been looking for near-net-size molding methods for complex-shaped ceramic components, which has become an important link to ensure the quality of ceramic components and obtain materials with practical application value. Ceramic molding process methods can generally be divided into two categories: dry method and wet method. In contrast, the wet forming process has the advantages of simple process, uniform composition of the formed body, less defects, and easy forming of complex-shaped parts, etc., and has strong pract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/48C04B35/10C04B35/563C04B35/565C04B35/584C04B35/14C04B35/56
Inventor 戴金辉黄翔王培培刘宗义朱志斌吴平伟
Owner OCEAN UNIV OF CHINA
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