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Preparation method of MgAlON transparent ceramic powder

A technology of transparent ceramics and powder, applied in the field of optical materials, can solve the problems of high porosity and difficult to achieve optical transparency, and achieve the effects of low cost, excellent optical transmission performance, and low C content

Active Publication Date: 2018-12-21
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For another example, Yan et al. (Ceram.Int.44(2018), 3856-3861) proposed that this method is used to prepare MgAlON, but it is mainly used for refractory materials, and strictly speaking, his method belongs to one-step sintering to obtain MgAlON. The porosity in ceramics is usually high, and it is difficult to achieve optical transparency in terms of performance

Method used

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  • Preparation method of MgAlON transparent ceramic powder
  • Preparation method of MgAlON transparent ceramic powder
  • Preparation method of MgAlON transparent ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of MgAlON transparent ceramic powder, comprising the following steps:

[0028] (1) Weighing of raw materials: according to a certain proportion, weigh Al powder, γ-Al 2 o 3 Powder and MgO powder, mixed powder, set aside;

[0029] The ratio is: Al powder, γ-Al 2 o 3 The mass fractions of MgO powder and MgO powder are 4wt%, 80wt%, 16wt% respectively;

[0030] The average particle size of the Al powder is 2.5 μm, and the purity is 99.95wt%; γ-Al 2 o 3 Powder average particle size 20nm, purity 99.5wt%; MgO powder average particle size 100nm, purity 99.99wt%;

[0031] (2) Dispersion by ball milling: disperse the mixed powder obtained in step (1) in absolute ethanol, and ball mill for 16 hours to obtain a slurry;

[0032] The rotational speed of the ball mill is 120r / m; the balls used in the ball mill are alumina balls with a purity of 99wt%; the mass ratio of the balls to the mixed powder is 5:1;

[0033] (3) Slurry drying: take the obtained slur...

Embodiment 2

[0039] A preparation method of MgAlON transparent ceramic powder, comprising the following steps:

[0040] (1) Weighing of raw materials: according to a certain proportion, weigh Al powder, γ-Al 2 o 3 Powder and MgO powder, mixed powder, set aside;

[0041] The ratio is: Al powder, γ-Al 2 o3 The mass fractions of MgO powder and MgO powder are 5wt%, 88wt%, 7wt% respectively;

[0042] The average particle size of the Al powder is 2.5 μm, and the purity is 99.5wt%; γ-Al 2 o 3 Powder average particle size 20nm, purity 99.99wt%; MgO powder average particle size 100nm, purity 99.5wt%;

[0043] (2) Dispersion by ball milling: disperse the mixed powder obtained in step (1) in absolute ethanol, and ball mill for 18 hours to obtain a slurry;

[0044] The rotational speed of the ball mill is 100r / m; the balls used in the ball mill are zirconia balls with a purity of 99wt%; the mass ratio of the balls to the mixed powder is 5:1;

[0045] (3) Slurry drying: take the obtained slurry ...

Embodiment 3

[0051] A preparation method of MgAlON transparent ceramic powder, comprising the following steps:

[0052] (1) Weighing of raw materials: according to a certain proportion, weigh Al powder, γ-Al 2 o 3 Powder and MgO powder, mixed powder, set aside;

[0053] The ratio is: Al powder, γ-Al 2 o 3 The mass fractions of MgO powder and MgO powder are 6wt%, 82wt%, 12wt% respectively;

[0054] The average particle size of the Al powder is 2 μm, and the purity is 99.9 wt %; γ-Al 2 o 3 Powder average particle size 50nm, purity 99.99 wt%; MgO powder average particle size 70nm, purity 99.5 wt%;

[0055] (2) Dispersion by ball milling: disperse the mixed powder obtained in step (1) in absolute ethanol, and ball mill for 20 hours to obtain a slurry;

[0056] The rotational speed of the ball mill is 100r / m; the balls used in the ball mill are alumina balls with a purity of 99.9wt%; the mass ratio of the balls to the mixed powder is 8:1;

[0057] (3) Slurry drying: take the obtained sl...

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Abstract

A preparation method of MgAlON transparent ceramic powder comprises the following steps: (1), weighing raw materials: according to a certain ratio, weighing Al powder, gamma-Al2O3 powder and MgO powder to obtain mixed powder for later use; (2), performing ball milling dispersion: dispersing the mixed powder obtained in the step (1) in absolute ethanol, and performing ball milling to obtain a slurry; (3), drying the slurry: drying the slurry obtained in the step (2) to obtain dry powder; and (4), reacting for synthesizing: taking the dry powder obtained in the step (3), putting into a crucible,then placing together with the crucible in a high-temperature sintering furnace, inflating flowing nitrogen gas, heating to 1500-1700 DEG C at a heating rate of 5-15 DEG C / min, preserving heat for 1-3 h, and then naturally cooling to obtain the MgAlON transparent ceramic powder. The MgAlON transparent ceramic powder prepared by the preparation method is high in purity and fine in particle size, and is suitable for producing transparent ceramic.

Description

technical field [0001] The invention relates to a preparation method of MgAlON transparent ceramic powder, which belongs to the field of optical materials. Background technique [0002] MgAlON is a material that uses MgO to stabilize the AlON structure. The MgAlON transparent ceramic made into a block is a new material that integrates structure and function. It has the same properties as AlON, MgAl 2 o 4 Similar properties of typical spinel structure ceramics, such as: wide electromagnetic wave transmission range (0.2 μm ~ 6.5 μm), optical isotropy, excellent mechanical properties (high bending strength, high hardness), etc., are expected to be applied In infrared windows, radome, detector optical window, transparent armor and other fields. [0003] There are mainly two methods for the preparation of this material: one is the reaction sintering method, usually using AlN (or Al, N 2 ), Al 2 o 3 , MgO as the raw material, mixed and sintered by reaction to obtain MgAlON tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/626
CPCC04B35/58C04B35/622C04B35/62605C04B2235/3206C04B2235/3217C04B2235/6562C04B2235/6567C04B2235/95C04B2235/9653
Inventor 谢忠祥刘海艳
Owner HUNAN INST OF TECH
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