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Dense europium tantalum oxynitride ceramics and preparation method thereof

A technology of oxynitride and ceramics, which is applied in the field of dense europium tantalum oxynitride ceramics and its preparation, can solve the problems of short time consumption, high temperature, and long sintering time, so as to improve density, eliminate porosity, and increase density. The Effect of Density and Purity

Active Publication Date: 2022-02-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has long sintering time and high temperature. Therefore, it is urgent to develop a short-time sintering method to obtain high-density, high-purity, high-dielectric constant europium-tantalum oxynitride ceramics.

Method used

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  • Dense europium tantalum oxynitride ceramics and preparation method thereof
  • Dense europium tantalum oxynitride ceramics and preparation method thereof
  • Dense europium tantalum oxynitride ceramics and preparation method thereof

Examples

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Embodiment 1

[0030] A method for preparing dense europium-tantalum oxynitride ceramics of the present invention, comprising the following steps:

[0031] S1. Mix 5g of europium-tantalum oxynitride ceramic powder with 20mL of absolute ethanol evenly, mill with polyurethane ball milling beads for 4 hours in a polyurethane ball mill tank, dry at 100°C for 8 hours, and then sieve with 5000 mesh to obtain pre-sintered powder ;

[0032] S2. Put 3 g of the pre-sintered powder obtained in step S1 into a Φ12mm graphite mold, and perform initial sintering in a spark plasma sintering equipment. The process conditions are: mechanical pressure 140MPa, nitrogen atmosphere, heating rate 400°C / min, sintering temperature The temperature is 1400°C, the holding time is 1min, and after natural cooling, the ceramic primary sintered body is obtained;

[0033] S3. Put the initial ceramic sintered body obtained in step S2 into a tube furnace, and perform secondary sintering under the conditions of ammonia gas at...

Embodiment 2

[0051] A method for preparing dense europium-tantalum oxynitride ceramics according to the present invention is basically the same as that in Example 1, except that in step S2, the spark plasma sintering temperature is 1400° C., and the holding time is 10 minutes. After testing, the EuTaO prepared in this example 2 The N oxynitride ceramic sheet has a density of 96.57% and a closed porosity of 3.14%.

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Abstract

The invention discloses a dense europium-tantalum oxynitride ceramic and a preparation method thereof. The preparation method comprises uniformly mixing europium-tantalum oxynitride ceramic powder with ethanol, ball milling, drying and sieving to obtain pre-sintered powder, and pre-sintering The sintered powder is subjected to discharge plasma sintering under pressure and vacuum conditions or under pressure and protective atmosphere. The sintering temperature is 1350 ° C ~ 1450 ° C and cooled naturally to obtain a ceramic primary sintered body. The ceramic primary sintered body is placed in an ammonia atmosphere, Secondary sintering is carried out under the condition of no mechanical pressure, and after cooling down, dense europium tantalum oxynitride ceramics are obtained. The preparation method of the invention is short in time, and the prepared dense europium-tantalum oxynitride ceramic has high density and high purity, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of high-performance dielectric ceramic materials, in particular to a dense europium-tantalum oxynitride ceramic and a preparation method thereof. Background technique [0002] With the continuous development of materials science, there is an increasing demand for new perovskite-type functional materials with functional properties such as dielectric / electronic, magnetic, photocatalytic, and energy conversion applications. Rare earth perovskite oxynitrides have become a material that has received international attention in recent years. They can combine the advantages of transition metal nitrides / oxides, and have better environmental (air, acid / alkali, etc.) stability than nitrides. , while having a smaller bandgap than oxides. As a new type of perovskite material, perovskite-type europium-tantalum oxynitride has high dielectric constant and unique magnetic properties. It has broad application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/64
CPCC04B35/58C04B35/622C04B35/64C04B2235/3852C04B2235/666
Inventor 李端李俊生曾良
Owner NAT UNIV OF DEFENSE TECH