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Method for preparing nano aluminum nitride powder through sol-gel foaming

A technology of nano-aluminum nitride and foaming method, which is applied in the direction of chemical instruments and methods, nitrogen compounds, nanotechnology, etc., and can solve the problems of difficult large-scale industrial production, complex production process of nano-aluminum nitride powder, no production process, etc. problems, to achieve the effect of novel preparation method, low cost and good spherical particle size

Pending Publication Date: 2022-04-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem solved by the present invention is that the production process of nano-aluminum nitride powder is generally complicated, and there is no simple production process at present, so it is difficult to carry out large-scale industrial production

Method used

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  • Method for preparing nano aluminum nitride powder through sol-gel foaming
  • Method for preparing nano aluminum nitride powder through sol-gel foaming
  • Method for preparing nano aluminum nitride powder through sol-gel foaming

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The method for preparing nano aluminum nitride powder by sol-gel foaming comprises the following steps.

[0033] (1) Weigh aluminum nitrate nonahydrate and sucrose according to the molar ratio of element molar ratio Al:C=1:10, weigh according to the mass ratio of aluminum nitrate nonahydrate and ammonium chloride 1:0.16, and weigh the raw materials After adding a certain amount of water to dissolve, dry at 45°C to a light yellow transparent gel, then foam at 300°C, grind the fluffy and porous substance to obtain a reddish-brown precursor powder, which is Formed in the foaming fluffy process, it is composed of amorphous nano-scale alumina and carbon, and the alumina is evenly wrapped by carbon.

[0034] (2) The nano-scale precursor powder is pretreated, specifically roasting at 600°C for 100 minutes, then adding a small amount of carbon powder for grinding, and then nitriding with nitrogen in a tube furnace. The heating process is: at 5°C The heating rate was raised fro...

Embodiment 2

[0038] (1) Weigh aluminum nitrate nonahydrate and glucose according to the molar ratio of element molar ratio Al:C=1:10, weigh according to the mass ratio of aluminum nitrate nonahydrate and ammonium acetate 1:0.2, add the weighed raw materials After a certain amount of water is dissolved, it is dried at 45°C to light yellow transparent gel, and then foamed at 350°C, and the fluffy and porous substance is ground to obtain a reddish-brown precursor powder, which is a hair Formed during the fluffy process of bubbles, it is composed of amorphous nano-scale alumina and carbon, and alumina is evenly wrapped by carbon.

[0039] (2) The nanoscale precursor powder is pretreated and then nitrided at high temperature. The heating process is as follows: the heating rate is 5° C. / min from room temperature to 1400° C., and then kept at this temperature for 2 hours.

[0040] (3) Heat the carbon-containing nano-aluminum nitride powder in the air at a heating rate of 7 °C / min to 580 °C, keep ...

Embodiment 3

[0043] (1) Weigh aluminum nitrate nonahydrate and glucose according to the molar ratio of element molar ratio C:Al=1:9, weigh according to the mass ratio of aluminum nitrate nonahydrate and ammonium oxalate 1:0.18, add the weighed raw materials After a certain amount of water is dissolved, it is dried at 45°C to a light yellow transparent gel, and then foamed at 280°C, and the fluffy and porous substance is ground to obtain a reddish-brown precursor powder. Formed in the process of foaming and fluffy, it is composed of amorphous nano-scale alumina and carbon, and the alumina is uniformly wrapped by carbon.

[0044] (2) The nanoscale precursor powder is pretreated and then nitrided at high temperature. The heating process is as follows: the heating rate is 5° C. / min from room temperature to 1400° C., and then kept at this temperature for 2.5 hours.

[0045] (3) Heat the carbon-containing nano-aluminum nitride powder in air at a heating rate of 7 °C / min to 580 °C, keep it warm f...

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Abstract

The invention discloses a method for preparing nano aluminum nitride powder by sol-gel foaming, which comprises the following steps: (1) weighing aluminum nitrate nonahydrate, water-soluble sugar and a low-molecular foaming agent according to a certain mass ratio or molar ratio, adding water into the raw materials, stirring, dissolving to form sol, drying to obtain xerogel, foaming in a muffle furnace at 220-400 DEG C, and cooling to room temperature to obtain nano aluminum nitride powder; grinding the obtained product to obtain reddish brown precursor powder; (2) pretreating the obtained precursor powder, placing the pretreated precursor powder in a tubular furnace in a nitrogen or ammonia atmosphere, carrying out high-temperature nitridation, heating to 1100-1500 DEG C from room temperature at a speed of 0.1-6 DEG C / min, and carrying out heat preservation for 0.5-4 hours, so as to obtain nano aluminum nitride powder containing amorphous carbon; and (3) decarburizing the carbon-containing nano aluminum nitride powder in air at 550-600 DEG C to obtain the high-purity nano aluminum nitride powder. The method has the advantages of simple experimental equipment, simple process, controllable operation, wide and easily available raw materials and lower cost, and is suitable for producing the nanoscale aluminum nitride powder on a certain scale. The prepared aluminum nitride powder has the advantages of high purity, good spherical particle size and narrower particle size distribution.

Description

technical field [0001] The invention relates to a method for preparing nano-aluminum nitride powder by sol-gel foaming, and belongs to the technical field of preparing nano-aluminum nitride. Background technique [0002] Aluminum nitride is an atomic crystal, hexagonal crystal system, belongs to diamond nitride, and is a fibrous ore-type covalent bond compound with [AlN4] tetragon as the structural unit. The crystal is white or gray, and the decomposition temperature at normal pressure is 2200-2450 ° C , the theoretical density is 3.26 g / cm3, and the Mohs hardness is 7-8. Because of its high thermal conductivity, low dielectric constant, high resistivity, non-toxic, matching with silicon expansion coefficient, chemical stability and corrosion resistance, etc., it has broad application in the fields of electronic information, energy chemical industry, transportation, etc. application prospects. [0003] High-quality powder raw material is a prerequisite for obtaining high-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072C30B1/10C30B28/02C30B29/40B82Y40/00
Inventor 王德强王双双刘梦阳
Owner EAST CHINA UNIV OF SCI & TECH
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