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Aluminum oxynitride ceramic powder and preparation method thereof

A ceramic powder and aluminum oxynitride technology, which is applied in the field of aluminum oxynitride ceramic powder and its preparation, can solve the problems of high cost and limited application range, and achieve the effect of low synthesis temperature

Active Publication Date: 2020-08-14
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical vapor deposition method is currently the method with the lowest temperature for synthesizing AlON, but at present, this method has high cost and limited scope of application, and is mainly used to prepare AlON thin films or coatings

Method used

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  • Aluminum oxynitride ceramic powder and preparation method thereof
  • Aluminum oxynitride ceramic powder and preparation method thereof
  • Aluminum oxynitride ceramic powder and preparation method thereof

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Embodiment 1

[0041] A preparation method of the aluminum oxynitride ceramic powder of the present invention comprises the following steps:

[0042] (1) Preparation of aluminum source and carbon source: Dissolve aluminum sec-butoxide (183mL, 0.72mol) in absolute ethanol, then slowly add 8mL deionized water into the ethanol solution of aluminum sec-butoxide to obtain sec-butanol Aluminum mixed solution, wherein the concentration of aluminum sec-butoxide is 1.4mol / L; and rapidly stir to prepare 580mL transparent and stable aluminum sec-butoxide sol.

[0043] Glucose (14.4 g, 80 mmol) and urea (3.6 g, 60 mmol) were dissolved in 28 mL of deionized water, and 14 mL of ethylene glycol was added to obtain a carbon source mixed solution.

[0044] (2) Preparation of aluminum oxynitride ceramic precursor: Mix the aluminum sec-butoxide sol obtained in step (1) with the carbon source mixed solution, and stir at 60°C to make aluminum sec-butoxide generate under the action of water and ethanol The hydro...

Embodiment 2

[0049] A preparation method of the aluminum oxynitride ceramic powder of the present invention comprises the following steps:

[0050] (1) Preparation of aluminum source and carbon source: Dissolve aluminum sec-butoxide (200mL, 0.8mol) in absolute ethanol, then slowly add 10mL deionized water into the ethanol solution of aluminum sec-butoxide to obtain sec-butanol Aluminum mixed solution, wherein the concentration of aluminum sec-butoxide is 1.2mol / L; and rapidly stirred to prepare 665mL transparent and stable aluminum sec-butoxide sol.

[0051] Glucose (14.4 g, 80 mmol) and urea (3.6 g, 60 mmol) were dissolved in 28 mL of deionized water, and 14 mL of ethylene glycol was added to obtain a carbon source mixed solution.

[0052] (2) Preparation of aluminum oxynitride ceramic precursor: mix the aluminum sec-butoxide sol obtained in step (1) with the carbon source mixed solution, and fully stir at 60°C for 2 hours, so that the aluminum sec-butoxide can react with water and ethano...

Embodiment 3

[0057] A preparation method of the aluminum oxynitride ceramic powder of the present invention comprises the following steps:

[0058] (1) Preparation of aluminum source and carbon source: Dissolve aluminum sec-butoxide (200mL, 0.8mol) in absolute ethanol, then slowly add 10mL deionized water into the ethanol solution of aluminum sec-butoxide to obtain sec-butanol Aluminum mixed solution, wherein the concentration of aluminum sec-butoxide is 1.3mol / L; and rapidly stirred to prepare 615mL transparent and stable aluminum sec-butoxide sol.

[0059] Glucose (18 g, 0.1 mol) and urea (4.8 g, 80 mmol) were dissolved in 28 mL of deionized water, and 14 mL of ethylene glycol was added to obtain a carbon source mixed solution.

[0060](2) Preparation of aluminum oxynitride ceramic precursor: mix the aluminum sec-butoxide sol obtained in step (1) with the carbon source mixed solution, and fully stir at 60°C for 2 hours, so that the aluminum sec-butoxide can react with water and ethanol ...

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Abstract

The invention discloses aluminum oxynitride ceramic powder and a preparation method thereof. The aluminum oxynitride ceramic powder is Al5O6N. The preparation method comprises that an aluminum oxynitride precursor is prepared from organo-aluminium alcoholate and a saccharide compound as raw materials through a sol-gel method, the aluminum oxynitride precursor produces gamma-Al2O3 and carbon blackduring the heating process, a part of gamma-Al2O3 and carbon black undergo a carbothermal nitridation reduction reaction at 1350-1550 DEG C to produce AIN, and the AIN and the rest of gamma-Al2O3 undergo a high temperature solid-phase reaction at 1750-1850 DEG C to produce Al5O6N. The preparation method comprises (1) preparing an aluminum source and a carbon source, (2) preparing an AlON ceramic precursor and (3) carrying out stepwise heat treatment. The aluminum oxynitride ceramic powder has the characteristics of high purity and small and uniform particle sizes. Compared with the conventional solid phase synthesis method, the preparation method has the advantages of low synthesis temperature, simple preparation processes and low preparation cost.

Description

technical field [0001] The invention belongs to the technical field of functional ceramics, in particular to an aluminum oxynitride ceramic powder and a preparation method thereof. Background technique [0002] The transparent spinel γ-AlON ceramic material has high optical transmittance in the visible light to mid-infrared band, and its characteristic is that it has isotropic optical isotropy. Up to 80% or more. In addition to good optical properties, it also has good physical, mechanical and chemical properties, especially its isotropic characteristics, so transparent AlON ceramic materials are ideal for missile fairings, infrared window materials for high Mach number missiles and Preferred material for ballistic armor materials. For this reason, the United States lists this material as one of the materials for the important development of national defense in the 21st century. [0003] In order to prepare high-density transparent AlON ceramic materials, the main method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/626C04B35/624
CPCC04B35/58C04B35/624C04B35/62605C04B2235/5436C04B2235/658C04B2235/661C04B2235/95
Inventor 王思青张术伟王衍飞张长瑞李斌杨焕周六顺肖永红
Owner NAT UNIV OF DEFENSE TECH
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