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Preparation method of AlON powder, AlON powder and application of AlON powder

A powder and system technology, which is applied in the field of special ceramic preparation, can solve the problems of restricting wide application, optical anisotropy, and difficult processing, etc., and achieve the effect of preventing low purity, reducing surface properties, and improving sintering activity

Pending Publication Date: 2022-04-08
有研资源环境技术研究院(北京)有限公司 +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The mechanical properties of sapphire single crystal are excellent, but its disadvantages such as optical anisotropy, long growth cycle, high preparation cost and difficult processing limit its wide application.

Method used

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  • Preparation method of AlON powder, AlON powder and application of AlON powder
  • Preparation method of AlON powder, AlON powder and application of AlON powder
  • Preparation method of AlON powder, AlON powder and application of AlON powder

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preparation example Construction

[0043] In a first aspect, the present invention provides a method for preparing AlON powder, such as figure 1 As shown, the method includes:

[0044] Step 1, weighing the nano-alumina powder and carbon powder according to the mass ratio, adding 0-10wt% dispersant, and using absolute ethanol as a medium, mixing by ball milling to obtain a mixed powder;

[0045] Step 2, using the carbothermal reduction nitriding method to sinter the mixed powder obtained in the above step 1;

[0046]In step 3, the powder sintered in the above step 2 is subjected to planetary ball milling treatment. After the treatment, 0-10wt% dispersant is added with anhydrous ethanol as a medium, and ultrasonic dispersion is used to obtain the AlON powder.

[0047] The present invention adds dispersant in step 1, has avoided the agglomeration of raw material in the mixing process and causes the homogeneity of mixed powder poor, and the AlON powder that is prepared has many impurities etc., and adds dispersant...

Embodiment 1

[0080] Alumina powder and carbon powder with a purity of 99.99% were weighed at a ratio of 94.2wt%: 5.8wt%, and 2wt% of D3005 dispersant was added, and mixed by planetary ball milling, wherein the ball milling medium was absolute ethanol at a speed of 200r / min, ball milling time 4h, then drying and sieving; the evenly mixed powder was transferred into a special boron nitride crucible, and a vacuum carbon tube furnace was used to synthesize the powder, specifically in a nitrogen atmosphere flowing at 10L / min The temperature rises to 1600°C and keeps warm for 60 minutes, then continues to rise to 1800°C, keeps warm for 60 minutes and then cools with the furnace; the powder is treated by planetary ball milling, the ball milling speed is 300r / min-400r / min, and the ball-to-material ratio is 10: 1. The ball milling time is 12 hours; then add absolute ethanol and 5wt% D3005 dispersant to the powder, use ultrasonic vibration for 10 minutes, and dry to obtain AlON powder.

[0081] The...

Embodiment 2

[0083] Alumina powder and carbon powder with a purity of 99.99% are weighed at a ratio of 94.2wt%:5.8wt%, and 2wt% of A1101 dispersant is added, and mixed by planetary ball milling, wherein the ball milling medium is absolute ethanol, and the speed is 200r / min, ball milling time 4h, then drying and sieving; the evenly mixed powder was transferred into a special boron nitride crucible, and a vacuum carbon tube furnace was used to synthesize the powder, specifically in a nitrogen atmosphere flowing at 10L / min , the temperature rises to 1650°C, keeps warm for 30 minutes, then continues to rise to 1850°C, keeps warm for 30 minutes, and then cools with the furnace; the powder is treated by planetary ball milling, the ball milling speed is 400r / min, the ball-to-material ratio is 5:1, and the ball milling time is 8h; then add absolute ethanol and 5wt% A1101 dispersant to the powder, vibrate ultrasonically for 30 minutes, and dry to obtain AlON powder.

[0084] The AlON powder prepar...

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Abstract

The invention provides a preparation method of AlON powder, the AlON powder and application of the AlON powder, and the method comprises the following steps: weighing nano aluminum oxide powder and carbon powder according to a mass ratio, adding 0-10wt% of a dispersant, and mixing by taking absolute ethyl alcohol as a medium and adopting a ball milling method to obtain mixed powder; sintering the mixed powder by using a carbon thermal reduction nitridation method; carrying out planetary ball milling treatment on the sintered powder, adding 0-10wt% of a dispersing agent by taking absolute ethyl alcohol as a medium after the treatment is finished, and carrying out dispersion treatment by adopting ultrasonic waves, so as to obtain the AlON powder, the dispersing agent is added step by step, the overall dispersing performance of the powder is improved, the AlON powder with high dispersity, high phase purity, small particle size and high sintering activity is prepared, the AlON powder is applied to preparation of the AlON transparent ceramic, and the AlON transparent ceramic with good performance can be obtained.

Description

technical field [0001] The invention relates to the field of preparation of special ceramics, in particular to a preparation method of AlON powder, AlON powder and application thereof. Background technique [0002] Infrared window and fairing materials can be divided into two categories: medium-wave infrared materials (3-5 μm) and long-wave infrared materials (8-14 μm) according to the wavelength range of work. Commonly used mid-wave infrared materials include sapphire single crystal and magnesium fluoride, magnesium aluminum spinel, AlON, and yttrium oxide transparent ceramics. Among them, MgF 2 Transparent ceramics are currently the most mature mid-infrared materials. It has high infrared transmittance (91%) and wide light transmission range (0.7-8.8μm), which can realize infrared / radar composite guidance, but its hardness and thermal shock resistance are poor, so it is not suitable for high-speed applications aircraft. The mechanical properties of sapphire single crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/626
Inventor 刘宇阳王星明孙悦白雪储茂友韩沧王涛
Owner 有研资源环境技术研究院(北京)有限公司
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