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Preparation method of superfine and high-purity gamma-ALON transparent ceramics powder

A transparent ceramic and high-purity technology, which is applied in the field of preparation of γ-AlON transparent ceramic powder, can solve the problems that γ-AlON powder is not conducive to the promotion of engineering production, and achieves easy post-milling treatment, fine particle size, and reduced The effect of composition temperature and composition time

Inactive Publication Date: 2010-12-29
SHANGHAI FRP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of equipment, these two methods for rapid synthesis of γ-AlON powder are not conducive to the promotion of engineering production

Method used

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  • Preparation method of superfine and high-purity gamma-ALON transparent ceramics powder
  • Preparation method of superfine and high-purity gamma-ALON transparent ceramics powder
  • Preparation method of superfine and high-purity gamma-ALON transparent ceramics powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0030] Select high-purity γ-Al 2 o 3 Powder (average particle size is 0.4μm, specific surface area is 90-110m 2 / g) and nano-bamboo charcoal powder (100~200nm) are mixed according to the ratio of Table 1 to prepare each 100 grams of precursor powders; add 250 grams of dehydrated alcohol after the powders are mixed, and use zirconia balls with a diameter of 10 mm as grinding balls, The quality of the balls is 500 grams, put them into a planetary high-energy ball mill, and mix them for 2 hours under the condition of working frequency 50Hz; bake the obtained slurry at 55°C for 24 hours, then dry it at 120°C for 5 hours, and then 80 mesh sieve; the precursor mixed powder obtained after sieving is put into an alumina crucible (99 porcelain) with a diameter of 30mm, and the loose packing height of the powder is controlled to be less than 15mm, covered with a lid, put into a large graphite crucible and added Cover, raise the temperature to 1100°C at a heating rate of 10°C / min, and ...

Embodiment 5～8

[0032] Carry out embodiment 5 according to the method for embodiment 1, difference is to adopt carbon black (average particle diameter is 18nm) as carbon source. The obtained aluminum oxynitride powder is subjected to high-energy ball milling to obtain submicron aluminum oxynitride powder with an average particle size of 0.7-0.9 μm.

Embodiment 9～10

[0034] Examples 9 and 10 were carried out according to the method of Example 1, except that the high temperature synthesis time was 2 hours. The obtained aluminum oxynitride powder is subjected to high-energy ball milling to obtain submicron aluminum oxynitride powder with an average particle size of 0.7-0.9 μm.

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Abstract

The invention relates to a preparation method of superfine and high-purity gamma-ALON transparent ceramics powder, belonging to the filed of transparent ceramics material preparation. In the invention, the gamma-ALON transparent ceramics powder is prepared by combining a high energy ball mill with a carbothermic reduction nitriding method. The method of the invention is characterized by comprising the following steps: taking the gamma-Al2O3 powder with high specific surface area and carbon source, i.e. carbon black or nanometer powdered carbon as raw materials, mixing evenly by a wet process high energy ball mill and then drying; placing into a combined crucible of alumina and graphite to carry out the carbothermic reduction nitriding reaction; decarburizing by low-temperature process; and finally obtaining superfine and high-purity gamma-ALON transparent ceramics powder after being crushed by the high energy ball mill. The invention can synthesize pure phase alumina powder under the lower resultant temperature, has simple and feasible process, saves cost, and is suitable for industry production.

Description

technical field [0001] The invention belongs to the technical field of transparent ceramic powder preparation and provides a preparation method of gamma-AlON transparent ceramic powder. Background technique [0002] Aluminum oxynitride (γ-AlON) transparent ceramics have good physical, mechanical and chemical properties, as well as good light transmittance (the transmittance in the wavelength range of 0.2 μm to 5.0 μm can reach more than 80%), so it is The material of choice for high temperature infrared windows, bulletproof armor materials and dual-mode radomes, with excellent commercial and military application value. In order to obtain completely transparent aluminum oxynitride ceramics, the powder synthesis method is very important, and the goal is to prepare high-purity, ultrafine, less agglomerated, and highly active γ-AlON ceramic powders. [0003] High-temperature solid-state reaction method and carbothermal reduction nitriding method are the most commonly used synth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58
Inventor 雷景轩胡伟邬浩王萍萍赵中坚施志伟
Owner SHANGHAI FRP RES INST
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