Macromolecule network preparation method for high-purity ultra-fine aluminum nitride ceramic

A technology of ultra-fine aluminum nitride and polymer network, applied in the field of inorganic non-metallic materials, can solve the problems of stratification, coarse powder particle size, high cost, etc., and achieve lower synthesis temperature, fine powder particle size, and finer particle size Effect

Inactive Publication Date: 2009-05-13
SHENYANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only suitable for the laboratory, because it takes a long time to go from sol → gel → xerogel, and the specific gravity of the aluminum source and the carbon source material are different, and delamination is prone to occur during the drying process. This is not suitable for large-scale industrial scale production
The chemical vapor deposition method is a method developed in the late 1980s. This method uses the volatile compound of aluminum to react with ammonia or nitrogen at a temperature much higher than the theoretical reaction, and precipitates aluminum nitride from the gas phase ( A kind of method of AlN) ceramic powder, the price of this reaction raw material is expensive, also can't adapt to large-scale production requirement
Therefore, the defects of the above-mentioned several methods are: the powder particle size is coarse, the purity is low and the cost is high, thus it is not suitable for industrialized large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A polymer network preparation method of high-purity ultra-fine aluminum nitride ceramic powder is as follows:

[0016] 1. Ingredients: Weigh 110g of sucrose and 220g of aluminum nitrate powder. Wherein, the mass percentage of sucrose is 33%, and the mass percentage of aluminum nitrate is 67%. Weigh an appropriate amount of deionized water and set aside. Weigh 0.5 g of acrylamide, 0.1 g of N,N' methylene acrylamide and 0.2 g of ammonium persulfate. Wherein, the mass percent of acrylamide, N, N' methylene acrylamide and ammonium persulfate is 5:1:2. Then weigh an appropriate amount of ammonia water and set aside.

[0017] 2. Preparation of alumina (Al 2 o 3 ) and carbon (C) mixed powder: put the above-mentioned weighed aluminum nitrate powder into a beaker, add an appropriate amount of deionized water, stir, and prepare an aluminum nitrate solution with a concentration of 0.4mol / L. Put the weighed sucrose into the aluminum nitrate solution and stir to dissolve the s...

Embodiment 2

[0021] A polymer network preparation method of high-purity ultra-fine aluminum nitride ceramic powder is as follows:

[0022] 1. Ingredients: Weigh 200g of sucrose and 400g of aluminum nitrate powder. Wherein, the mass percentage of sucrose is 33%, and the mass percentage of aluminum nitrate is 67%. Weigh an appropriate amount of deionized water and set aside. Weigh 1g of acrylamide, N, N' - 0.04 g of methylene acrylamide and 0.16 g of ammonium persulfate. Wherein, the mass percent of acrylamide, N, N' methylene acrylamide and ammonium persulfate is 25:1:4. Then weigh an appropriate amount of ammonia water and set aside.

[0023] 2. Preparation of alumina (Al 2 o 3) and carbon (C) mixed powder: put the above-mentioned weighed aluminum nitrate powder into a beaker, add an appropriate amount of deionized water, stir, and prepare an aluminum nitrate solution with a concentration of 0.5mol / L. Put the weighed sucrose into the aluminum nitrate solution and stir to dissolve th...

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PUM

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Abstract

The invention relates to a macromolecular network preparation method for high-purity superfine aluminum nitride ceramic powder, which comprises the following steps: (1) preparing materials; (2) preparing mixed powder of aluminum nitride (Al2O3) and carbon (C); (3) synthesizing AlN powder; and (4) decarburization, wherein main raw materials are sugar, aluminum nitrate, acrylamide, N, N'-methylene acrylamide and ammonium persulphate. The key point of the macromolecular network preparation method for the high-purity superfine aluminum nitride ceramic powder is to form a macromolecular network structure by macromolecular polymerization. The high-purity superfine aluminum nitride ceramic powder has the characteristics of fine granularity, high purity and low cost, and is suitable for industrial mass production.

Description

Technical field: [0001] The invention relates to a method for preparing aluminum nitride (AlN) ceramic powder in the technical field of inorganic non-metallic materials, in particular to a method for preparing a polymer network of high-purity ultrafine aluminum nitride (AlN) ceramic powder. Background technique: [0002] The preparation method of aluminum nitride (AlN) ceramic powder has a long history, and so far, people have mastered a variety of preparation methods for preparing aluminum nitride (AlN) ceramic powder. For example, carbothermal reduction method, high energy ball milling method, sol-gel method, chemical vapor deposition method, etc. [0003] Carbothermal reduction method is based on ultrafine Al 2 o 3 Ceramic powder and carbon black are used as raw materials, mixed by mechanical ball milling, in a flowing nitrogen atmosphere, at 1400-1800 °C, use C to reduce Al 2 o 3 , the reduced Al then reacts with flowing nitrogen to form AlN ceramic powder. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/626
Inventor 张宁
Owner SHENYANG UNIV
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