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Method for quickly preparing gamma aluminum nitride oxygen transparent ceramic powder

A technology of aluminum oxynitride and transparent ceramics, applied in the field of preparing γ-aluminum oxynitride ceramic powder, can solve the problems of large content of mixed impurities, high energy consumption, deterioration of optical properties of dense γ-AlON ceramics, etc. The effect of uniform diameter, high efficiency and easy crushing

Inactive Publication Date: 2007-10-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, not only the energy consumption is high in the process of powder synthesis and ball milling, but also the content of impurities mixed in the ball milling process is very large, which leads to the deterioration of the optical properties of the prepared dense γ-AlON ceramics.

Method used

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  • Method for quickly preparing gamma aluminum nitride oxygen transparent ceramic powder
  • Method for quickly preparing gamma aluminum nitride oxygen transparent ceramic powder
  • Method for quickly preparing gamma aluminum nitride oxygen transparent ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] α-Al 2 o 3 Powder (purity greater than 99.99wt%, average particle size 0.5μm), AlN powder (purity greater than 99wt%, average particle size 0.05μm, specific surface area greater than 78m 2 / g) mixture is the raw material, where α-Al 2 o 3 The molar content of the powder was 72%, and the molar content of the AlN powder was 28%. Mix the materials by ball milling on a planetary ball mill for 10 hours, with absolute ethanol as the ball milling medium, high-purity Al 2 o 3 The ball is a milling ball, Al 2 o 3 Ball: Material (α-Al 2 o 3 powder and AlN powder): absolute ethanol mass ratio=2:1:3. The mixed material after ball milling was dried under vacuum at 83-87°C, and sieved through a 100-mesh sieve; 20 g of the dried mixed material was put into a circular graphite crucible whose inner wall was coated with boron nitride, and the inner diameter of the crucible was 40 mm. Placed in a graphite reactor, the inner diameter of the graphite reactor is 50mm. Put the grap...

Embodiment 2

[0030] α-Al 2 o 3 Powder (purity greater than 99.99wt%, average particle size 0.5μm), AlN powder (purity greater than 99wt%, average particle size 0.05μm, specific surface area greater than 78m 2 / g) mixture is the raw material, where α-Al 2 o 3 The molar content of the powder is 60%, and the molar content of the AlN powder is 40%. Mix the materials by ball milling on a planetary ball mill for 10 hours, with absolute ethanol as the ball milling medium, high-purity Al 2 o 3 The ball is a milling ball, Al 2 o 3 Ball: Material (α-Al 2 o 3 powder and AlN powder): absolute ethanol mass ratio=2:1:3. The mixed material after ball milling was dried under vacuum at 83-87°C, and sieved through a 100-mesh sieve; 20 g of the dried mixed material was put into a circular graphite crucible whose inner wall was coated with boron nitride, and the inner diameter of the crucible was 40 mm. Placed in a graphite reactor, the inner diameter of the graphite reactor is 50mm. Put the graphi...

Embodiment 3

[0032] α-Al 2 o 3 Powder (purity greater than 99.99wt%, average particle size 0.5μm), AlN powder (purity greater than 99wt%, average particle size 0.05μm, specific surface area greater than 78m 2 / g) mixture is the raw material, where α-Al 2 o 3 The molar content of the powder was 66%, and the molar content of the AlN powder was 34%. Mix the materials by ball milling on a planetary ball mill for 10 hours, with absolute ethanol as the ball milling medium, high-purity Al 2 o 3 The ball is a milling ball, Al 2 o 3 Ball: Material (α-Al 2 o 3 powder and AlN powder): absolute ethanol mass ratio=2:1:3. The mixed material after ball milling was dried under vacuum at 83-87°C, and sieved through a 100-mesh sieve; 20 g of the dried mixed material was put into a circular graphite crucible whose inner wall was coated with boron nitride, and the inner diameter of the crucible was 40 mm. Placed in a graphite reactor, the inner diameter of the graphite reactor is 50mm. Put the grap...

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Abstract

A process for fast preparing the transparent gamma-aluminum oxynitride ceramic powder includes such steps as proportionally mixing aluminum nitride powder with alpha-Al2O3 powder, drying, loading it into a graphite reactor containing N2 or N contained gas mixture, high-current heating to 1600-1850 deg.C at 50-500 deg.C / min, holding the temp for 0-60 min, and grinding.

Description

technical field [0001] The invention relates to a method for preparing gamma-aluminum oxynitride ceramic powder, which is suitable for preparing transparent ceramic parts. Background technique [0002] γ-aluminum oxynitride ceramics (AlON) are Al 2 o 3 -The stable solid solution phase with cubic spinel structure in AlN system has attracted much attention because of its excellent optical properties, dielectric properties and mechanical properties. Mechanical Properties of γ-AlON and α-Al 2 o 3 It is similar, and has excellent oxidation resistance at 1100 ° C. In addition, γ-AlON has good optical transparency from near ultraviolet, visible light to mid-infrared light region. γ-AlON can also prepare dense broadband transparent materials through a pressureless sintering process, so it has potentially important applications in both commercial and military fields, such as dental braces and ferrules, gas seals for high-pressure sodium vapor lamp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/10C04B35/582
Inventor 王皓孟志民王玉成王为民傅正义张清杰
Owner WUHAN UNIV OF TECH
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