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Preparation method of flake aluminum nitride powder

A technology of aluminum nitride and powder, which is applied in the field of preparation of flake aluminum nitride powder, can solve the problems of high temperature requirements, long synthesis time, high cost, etc. The effect of low threshold

Inactive Publication Date: 2018-09-11
董小琳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of low yield and easy self-sintering to form agglomerates in the direct nitriding method of aluminum powder in the prior art, long synthesis time, high temperature requirements and high cost in the carbothermal reduction method, the present invention provides a A preparation method for flaky aluminum nitride powder, comprising the following steps:

Method used

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  • Preparation method of flake aluminum nitride powder
  • Preparation method of flake aluminum nitride powder

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preparation example Construction

[0020] This embodiment provides a preparation method of flake aluminum nitride powder, comprising the following steps:

[0021] Step 1: dissolving aluminum salt and nitrogen-containing organic matter in a mixed solution of water and alcohol solvent, heating and stirring at 40-60°C until completely dissolved;

[0022] Step 2: Heat and stir the solution in step 1 at 60-80°C until white matter appears, then cool down to 40-45°C, and then obtain the aluminum nitride precursor through suction filtration;

[0023] Step 3: Transfer the aluminum nitride precursor to a high-temperature-resistant porcelain boat, keep the temperature at 900-1200°C in a mixed gas environment containing nitrogen, and obtain the required flake aluminum nitride powder after 2-4 hours, such as figure 1 Shown is the scanning electron microscope image of flake aluminum nitride, figure 2 It is the transmission electron microscope picture of flake aluminum nitride and its selected area electron diffraction. The...

Embodiment 1

[0031] The preparation method of the flaky aluminum nitride powder in the present embodiment comprises the following steps:

[0032] Step 1: Dissolve aluminum chloride and urea in a mixed solution of water and methanol, heat and stir at 40°C until completely dissolved, and the volume ratio of water to methanol is 1:1;

[0033] Step 2: Heat and stir the solution in step 1 at 60°C until a white substance appears, then cool down to 45°C, stir for 2 hours, and then obtain the aluminum nitride precursor through suction filtration;

[0034] Step 3: Transfer the aluminum nitride precursor to a high-temperature-resistant porcelain boat, keep the temperature at 1000° C. in a mixed gas environment containing nitrogen, and obtain the required flake aluminum nitride powder after 2 hours.

Embodiment 2

[0036] The preparation method of the flaky aluminum nitride powder in the present embodiment comprises the following steps:

[0037] Step 1: Dissolve aluminum chloride and melamine in a mixed solution of water and ethanol, heat and stir at 50°C until completely dissolved, and the volume ratio of water to ethanol is 1:4;

[0038] Step 2: Heat and stir the solution in step 1 at 80°C until a white substance appears, then cool down to 40°C, stir for 2 hours now, and then obtain the aluminum nitride precursor through suction filtration;

[0039] Step 3: Transfer the aluminum nitride precursor to a high-temperature-resistant porcelain boat, and keep the temperature at 900° C. in a mixed gas environment containing nitrogen, and obtain the required flake aluminum nitride powder after 4 hours.

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Abstract

The invention discloses a preparation method of flake aluminum nitride powder and belongs to the field of ceramic. The preparation method comprises the following steps: dissolving aluminum salt and anitrogen-containing organic matter into a mixed solution of water and an alcohol type solvent; heating at 40 to 60 DEG C and stirring until the aluminum salt and the nitrogen-containing organic matterare completely dissolved; heating at 60 to 80 DEG C and stirring until a white substance is formed; cooling to 40 to 45 DEG C; then filtering to obtain an aluminum nitride precursor; transferring thealuminum nitride precursor into a high-temperature-resisting porcelain boat; keeping the temprature of 900 to 1200 DEG C for 2 to 4h under a mixed gas environment containing nitrogen gas, so as to obtain the needed flake aluminum nitride powder. The preparation method disclosed by the invention has the beneficial effects that the water and the alcohol type solvent are mixed and used as a solvent;in a heating process, the nucleation of the aluminum nitride precursor is controlled on an interface formed by the water and alcohol, and furthermore, the size of aluminum nitride is controlled; whena crystal nucleus is formed, the alcohol is volatilized, so that the aim of inhibiting the growth of the crystal nucleus is realized and the formed aluminum nitride is of a flake structure; the sizeis 10 microns or less and the thickness is controlled to be 100nm or less.

Description

technical field [0001] The invention relates to the field of ceramics, in particular to a method for preparing flake aluminum nitride powder. Background technique [0002] Aluminum nitride is a ceramic insulator (the thermal conductivity of polycrystalline material is 70-210W m -1 ·K -1 , while the single crystal can be as high as 275W·m -1 ·K -1 ), so that aluminum nitride has a high heat transfer capacity, which is widely used in microelectronics. The difference from beryllium oxide is that aluminum nitride is non-toxic. Aluminum nitride is treated with metal and can replace alumina and beryllium oxide for a large number of electronic instruments. Aluminum nitride is a covalently bonded substance with hexagonal crystals. The structure is the same shape as zinc sulfide and wurtzite. The space group of this structure is P63mc. Industrial-grade materials can only be produced by hot pressing and welding. The materials are very stable in an inert high-temperature environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/626
CPCC04B35/581C04B35/626
Inventor 董小琳其他发明人请求不公开姓名
Owner 董小琳
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