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A method for preparing aluminum nitride nanopowder by sol-gel method

A technology of nano-powder and gel method, applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve problems such as wide particle size distribution of aluminum nitride, difficulty in controlling combustion temperature, and complicated reaction process

Active Publication Date: 2020-12-22
安徽壹石通金属陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses urea as the combustion agent, the reaction process is relatively complicated, and the combustion temperature is difficult to control, resulting in a wide particle size distribution of aluminum nitride, and the formed aluminum nitride is mostly flake-like

Method used

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  • A method for preparing aluminum nitride nanopowder by sol-gel method
  • A method for preparing aluminum nitride nanopowder by sol-gel method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 100 g of AlOOH sol with a mass fraction of 5%, mix 0.1mol phenol and 0.085mol formaldehyde evenly, transfer it to AlOOH sol, raise the temperature to 80°C, adjust the pH to 1-2 with 2mol / L hydrochloric acid, and stir magnetically for 12 hours. Obtain a uniformly mixed gel of aluminum source and phenolic resin; cool to room temperature, add 0.01 mol of hexamethylenetetramine to it, stir for 30 minutes, transfer to an oven at 120°C and dry for 12 hours to obtain a uniform mixture of aluminum source and carbon source xerogel; xerogel in N 2 In the atmosphere, hold at 600°C for 2 hours to form carbon, and then at 1500°C, flow N 2 Calcined under the atmosphere for 12h, and the calcined product was decarbonized in the air atmosphere at 700°C for 2h.

[0037] The particle size of the prepared aluminum nitride powder is between 30nm and 120nm and the dispersibility is good.

Embodiment 2

[0039] Weigh Al(OH) with a mass fraction of 25% 3 Sol 20g, after mixing 0.1mol of phenol and 0.085mol of formaldehyde, transfer to Al(OH) 3 Sol, heat up to 85°C, adjust the pH to 1-2 with 2mol / L nitric acid, and stir magnetically for 12 hours to obtain a gel in which the aluminum source and phenolic resin are mixed uniformly; cool to room temperature and add 0.01mol of hexamethylenetetrafluoroethylene amine, stirred for 30min, transferred to an oven at 100°C and dried for 12h to obtain a dry gel in which the aluminum source and the carbon source were uniformly mixed; 2 In the atmosphere, hold at 600°C for 2 hours to form carbon, then at 1600°C, flow N 2 Calcined under atmosphere for 6h, the calcined product was decarbonized in air atmosphere at 700°C for 2h.

[0040] The particle size of the prepared aluminum nitride powder is between 50nm and 200nm and the dispersion is good.

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Abstract

The invention discloses a method for preparing aluminum nitride nano powder through a sol-gel method, and relates to the technical field of nano material preparation. Aluminum sol serves as an aluminum source, an organic polymer precursor serves as a carbon source, and dry gel where carbon source and the aluminum source are evenly mixed is obtained in the presence of a gelling agent and a curing agent; pyrolysis, calcining and decarbonization are carried out to obtain the grey-white AlN powder. The preparation method of the aluminum nitride nano powder is low in cost, the process operation issimple, the particle size distribution of the prepared aluminum nitride is 30-200 nm, and the dispersibility is good.

Description

Technical field: [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing aluminum nitride nanometer powder by using a sol-gel method. Background technique: [0002] Aluminum nitride ceramics have a series of excellent properties such as high thermal conductivity, low dielectric constant and dielectric loss, excellent bonding performance, high temperature resistance, chemical corrosion resistance, non-toxicity, and a thermal expansion coefficient that can be well matched with silicon. ; Widely used in the field of electronic devices. The nano-AlN powder has a small particle size and high reactivity, which can reduce the densification sintering temperature, which is beneficial to realize low-temperature sintering and reduce the cost of ceramic sintering. The forming and sintering process of aluminum nitride ceramics is not only related to the particle size of AlN powder, but also affected by its shape and partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/072B82Y40/00
CPCB82Y40/00C01B21/072C01P2002/72C01P2004/03C01P2004/62C01P2004/64
Inventor 杨杰蒋学鑫王礼鸿郭敬新
Owner 安徽壹石通金属陶瓷有限公司