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Method for preparing gradient ceramics by electric field-assisted high-valence counter ion controlled release curing

An electric field-assisted and counter-ion technology, which is applied in the field of electric-field-assisted high-priced counter-ion controlled-release solidification to prepare gradient ceramics, achieves the effects of improving molding efficiency, continuous composition, and avoiding uneven transition of composition gradients and thermodynamic mismatch.

Active Publication Date: 2019-03-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this process is mostly used to prepare high-performance homogeneous ceramics, but there are few reports on the preparation of gradient ceramics.

Method used

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  • Method for preparing gradient ceramics by electric field-assisted high-valence counter ion controlled release curing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 6.5g / L calcium iodate, 2.0wt% glyceryl diacetate cured 3.0wt% tetramethylammonium hydroxide dispersed 65vol% SiO at 20V / m electric field strength 2 slurry.

[0042] Mix 100g of silica powder, 3.0g of tetramethylammonium hydroxide and 24.5g of water, and ball mill for 1 hour at a rate of 300r / min to prepare a negatively charged ceramic slurry with a solid phase volume fraction of 65%. Then add 0.54g of calcium iodate, mix and mill at a ball milling rate of 250r / min for 20min, stir and degas under vacuum for 15min, then add 2.0g of glyceryl diacetate, stir the glass rod for 30s, inject into the mold, put into the field In an electrostatic field of 20V / m, heat the silica gel heating pad to 60°C and keep it for 1 hour, then demould it, dry it at 70°C for 24 hours, then raise the temperature to 1200°C at a rate of 5°C / min and hold it for 3 hours to obtain gradient silica ceramic sintered body.

Embodiment 2

[0044] 3.0wt% magnesium citrate, 1.0wt% ethyl acetate solidified 1.0wt% ammonium citrate dispersed 50vol% Al2O3 slurry at 5V / m electric field strength.

[0045] Mix 100g of alumina powder, 1.0g of ammonium citrate and 25.2g of water, and ball mill at a rate of 250r / min for 1.5h to prepare a negatively charged ceramic slurry with a solid phase volume fraction of 50%, and then add 3.0 g magnesium citrate, mix and ball mill for 30min at a ball milling rate of 200r / min, stir and degas under vacuum for 18min, then add 1.0g of ethyl acetate, stir the glass rod for 50s and then inject into the mold, put in a field strength of 5V / m In the electrostatic field, the silica gel heating pad was heated to 80°C for 0.5h and demolded, dried at 80°C for 12h, and then heated to 1500°C at a heating rate of 8°C / min for 2h to obtain a gradient alumina ceramic sintered body.

Embodiment 3

[0047] 2.5wt% magnesium oxide, 3.0wt% glycerol triacetate cured 5.0wt% ammonium polyacrylate dispersed 45vol% Si3N4 slurry under the electric field strength of 50V / m.

[0048] Mix 100g of silicon nitride powder, 5.0g of ammonium polyacrylate and 38.2g of water, and ball mill for 2.0h at a rate of 200r / min to prepare a negatively charged ceramic slurry with a solid phase volume fraction of 45%, and then add 2.5g of magnesia, mixed and milled at a ball milling rate of 250r / min for 15min, stirred and degassed under vacuum for 20min, then added 3.0g of glycerol triacetate, stirred for 40s with a glass rod, and then injected into the mold, and the field strength was 50V / In an electrostatic field of m, heat the silica gel heating pad to 45°C and keep it for 2.0 hours, then demould it, dry it at 75°C for 18 hours, then raise the temperature to 2000°C at a heating rate of 5°C / min and hold it for 4 hours to obtain a sintered gradient silicon nitride ceramic body.

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Abstract

The invention belongs to the field of gradient ceramic materials, and discloses a method for preparing gradient ceramics by electric field-assisted high-valence counter ion controlled release curing.The method comprises the following steps of (a) mixing ceramic powder, a dispersant and deionized water, and then sequentially adding a curing agent and an ester pH regulator for uniform mixing to obtain ceramic slurry; and (b) injecting the ceramic slurry into a mold, then placing the mold in a direct-current electrostatic field, heating the ceramic slurry, and carrying out heat preservation, wherein the pH regulator hydrolyzes to release a weak acid to react with the curing agent to release high-valence metal cations; the metal cations are distributed in a gradient concentration mode in theceramic slurry under action of an electrostatic field; the ceramic slurry is solidified to form a wet ceramic blank; and the wet ceramic blank is dried and sintered to obtain a desired gradient ceramic sintered body. According to the invention, the method has the advantages that gradient ceramics having adjustable composition gradient and continuous and uniform composition transition is formed; operation is simple; and the method is suitable for any negatively-charged ceramic slurry.

Description

technical field [0001] The invention belongs to the field of gradient ceramic materials, and more specifically relates to a method for preparing gradient ceramics through controlled release and solidification of high-priced counter ions assisted by an electric field. Background technique [0002] Gradient materials refer to heterogeneous materials with gradient changes in the composition or structure of the material in space and with gradual changes in functional properties. Generally, they show the inhomogeneity of the macrostructure and the continuity of the microstructure. In recent years, gradient materials have been gradually applied in fields such as chemistry, optics, biomedicine, electronic information, and aerospace. [0003] Gradient ceramic materials, as a kind of gradient materials, have also received extensive attention from researchers at home and abroad in recent years. Zhu Yinyin and others prepared a gradient lead zirconate titanate (PZT) ferroelectric cera...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/14C04B35/584C04B35/63C04B35/632C04B41/00
CPCC04B35/10C04B35/14C04B35/584C04B35/6303C04B35/632C04B41/0045C04B2235/6562C04B2235/775
Inventor 吴甲民陈安南程立金陆路蔡微昊陈双史玉升李晨辉
Owner HUAZHONG UNIV OF SCI & TECH
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