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Preparation method of aluminum nitride powder

A technology of aluminum nitride and powder, which is applied in the field of ceramic powder preparation, can solve the problems of long synthesis time, high reaction temperature, and difficulty in mixing uniformly, and achieve the effect of efficient continuous preparation and improved conversion rate

Inactive Publication Date: 2022-02-15
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional carbothermal reduction preparation process, there are some shortcomings, such as: the proportion of raw materials varies greatly, it is difficult to mix evenly in the production process, the reaction temperature is high, the synthesis time is long, and the secondary carbon removal time is too long to make oxygen Elevated content, etc.

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

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preparation example Construction

[0046] The invention provides a method for preparing aluminum nitride powder. Specifically, the method first weighs γ-Al 2 o 3 Micropowder, carbon black, dispersant, binder, catalyst, biomass carbon source and water are mixed to obtain a precursor slurry; the precursor slurry is sprayed and granulated to obtain a precursor granulated powder; , adding the precursor granulated powder into the furnace tube of a tube furnace, rotating the furnace tube, and heating the precursor granulated powder to cause a carbothermal reduction reaction to obtain aluminum nitride raw powder; Decarburization treatment is carried out on the aluminum nitride raw powder under the atmosphere to obtain. Specifically, the aluminum source used in the present invention is γ-Al with large specific surface area, high reactivity and porous surface. 2 o 3 , using nano-carbon black as the carbon source for granulation, the highly reactive precursor granulation powder can be obtained. In the mixing process,...

Embodiment 1

[0058] Precursor granulation powder preparation: weigh 100 parts of γ-Al with an average particle size of 100nm 2 o 3 Micropowder, 40 parts of carbon black with an average particle size of 20nm, 0.75 parts of polyether dispersant span-80, 4 parts of PVA aqueous solution, 2 parts of AlF, 15 parts of β-cyclopaste, and 400 parts of deionized water in a ball mill tank, High-speed ball milling and mixing at a speed of 200 rpm and a ball milling time of 120 minutes to obtain a precursor slurry. The uniformly ground precursor slurry is injected into the spray granulation tower through a diaphragm pump to prepare a precursor granulation powder with high sphericity and excellent fluidity. Among them, the injection pressure of the diaphragm pump is 0.75MPa, the inlet temperature of the prilling tower is 300°C, and the outlet temperature is 90°C. The microstructure of the obtained granulated powder is shown in Figure 2. The obtained granulated powder is spherical and has a complete sha...

Embodiment 2

[0066] Precursor granulation powder preparation: weigh 100 parts of γ-Al with an average particle size of 500nm 2 o 3 Micropowder, 35 parts of carbon black with an average particle size of 10nm, 0.5 parts of polyether dispersant span-80, 1 part of PVA aqueous solution, 1.5 parts of AlF, 7.5 parts of β-cyclopaste, and 350 parts of deionized water in a ball mill tank, High-speed ball milling and mixing at a speed of 200 rpm and a ball milling time of 120 minutes to obtain a precursor slurry. The uniformly ground precursor slurry is injected into the spray granulation tower through a diaphragm pump to prepare a precursor granulation powder with high sphericity and excellent fluidity. Among them, the injection pressure of the diaphragm pump is 0.70MPa, the inlet temperature in the prilling tower is 290°C, and the outlet temperature is 90°C. The obtained granulated powder is spherical and complete in shape, without a large number of broken, hollow and bonded particles. The granul...

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Abstract

The invention provides a preparation method of aluminum nitride powder, which comprises the steps of: S1, weighing gamma-Al2O3 micro powder, carbon black, a dispersant, a binder, a catalyst, a biomass carbon source and water, and mixing to obtain precursor slurry; and performing spray granulation on the precursor slurry to obtain precursor granulation powder; S2, rotating the precursor granulation powder in a tubular furnace under nitrogen flow, and heating the precursor granulation powder for reaction to obtain raw aluminum nitride powder; and S3, carrying out decarburization treatment on the rawaluminum nitride powder in a decarburization atmosphere to obtain aluminum nitride powder.

Description

technical field [0001] The invention belongs to the field of ceramic powder preparation, and in particular relates to a production method of aluminum nitride. Background technique [0002] With the rapid development of electronic machines and electronic components in the direction of miniaturization, light weight, high speed, high efficiency, high integration, high reliability and high power output, the heat generated per unit volume of the device has increased sharply, which is harmful to the substrate. And the heat dissipation of packaging materials puts forward higher requirements. If the heat cannot be dissipated by the substrate in time, the device will be difficult to work normally, and in severe cases, it may even burn out. To meet this requirement, a series of heat dissipation substrate materials have been developed, such as alumina, silicon carbide, silicon nitride, aluminum nitride, mullite, beryllium oxide, etc. Compared with other materials, aluminum nitride (A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/626
CPCC04B35/581C04B35/62605C04B35/62695C04B2235/3217C04B2235/5454C04B2235/424
Inventor 肖汉宁覃航高朋召
Owner HUNAN UNIV