A method for preparing aluminum nitride

A technology of aluminum nitride and alumina, which is applied in the field of material science, can solve the problems of a large amount of nitrogen-containing waste gas or other waste gas, and achieve the effects of shortening the carbon removal steps, shortening the reaction time, and facilitating industrialization

Active Publication Date: 2019-04-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

However, in the process of preparing precursors, a large amount of nitrogen-containing waste gas or other waste gases will be generated

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the preparation method of aluminum nitride powder of this embodiment, concrete steps are as follows:

[0033] The first stage, carbon thermal reduction of alumina under vacuum to prepare solid products mainly of aluminum carbide and aluminum oxide carbon

[0034] (1) Mix alumina powder and graphite powder at a mass ratio of 2.8:1 to obtain mixed raw materials;

[0035] (2) Put the mixed raw materials of step (1) in the reaction furnace, evacuate the reaction furnace until the pressure is lower than 5Pa, raise the temperature to 1300°C, and keep the temperature for 50 minutes, and continue to evacuate during the heat preservation process;

[0036] (3) After the heat preservation is completed, start to cool down. After the temperature drops to room temperature, stop vacuuming, open the reaction furnace, and take out the reaction product, which is mainly composed of aluminum carbide and aluminum carbon oxide;

[0037] The second stage, nitriding to prepare a...

Embodiment 2

[0041] Embodiment 2: the preparation method of aluminum nitride powder of this embodiment, concrete steps are as follows:

[0042] The first stage, carbon thermal reduction of alumina under vacuum to prepare solid products mainly of aluminum carbide and aluminum oxide carbon

[0043] (1) Mix alumina powder and graphite powder at a mass ratio of 2.8:1 to obtain mixed raw materials;

[0044] (2) Put the mixed raw materials in step (1) in the reaction furnace, evacuate the reaction furnace until the pressure is lower than 3Pa, raise the temperature to 1400°C, keep the temperature for 40 minutes, and continue to evacuate during the heat preservation process;

[0045] (3) After the heat preservation is completed, start to cool down. After the temperature drops to room temperature, stop vacuuming, open the vacuum furnace, and take out the reaction product, which is mainly composed of aluminum carbide and aluminum carbon oxide;

[0046] The second stage, nitriding to prepare aluminu...

Embodiment 3

[0050] Embodiment 3: the preparation method of aluminum nitride powder of this embodiment, concrete steps are as follows:

[0051] The first stage, carbon thermal reduction of alumina under vacuum to prepare solid products mainly of aluminum carbide and aluminum oxide carbon

[0052] (1) Mix alumina powder and carbon black at a mass ratio of 2.9:1 and mix them evenly to obtain mixed raw materials;

[0053] (2) Put the mixed raw materials in step (1) in the reaction furnace, evacuate the reaction furnace until the pressure is lower than 1Pa, raise the temperature to 1500°C, keep the temperature for 30 minutes, and continue to evacuate during the heat preservation process;

[0054] (3) After the heat preservation is completed, start to cool down. After the temperature drops to room temperature, stop vacuuming, open the reaction furnace, and take out the reaction product, which is mainly composed of aluminum carbide and aluminum carbon oxide;

[0055] The second stage, nitriding...

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PUM

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Abstract

The invention discloses a preparation technology of aluminum nitride. The preparation technology comprises the following two stages of 1, using aluminum oxide and carbon as raw materials, performing carbon thermal reduction reaction under the vacuum and high temperature conditions, and forming a solid product mainly containing aluminum carbide and aluminum oxycarbide; 2, using the product in the stage 1 as a raw material, grinding, putting into a carbon crucible or mixing with a small amount of carbon raw material, and performing high-temperature nitridation reaction under the nitrogen atmosphere, so as to obtain the aluminum nitride. The preparation technology has the advantages that the required temperature is lower, the reaction time is shorter, the carbon content in the obtained aluminum nitride powder is low, and the subsequent carbon step can be shortened or avoided; besides carbon monoxide, the other waste gases are not produced; the industrializing is easily realized.

Description

technical field [0001] The invention relates to a process for preparing aluminum nitride by a two-stage method, which belongs to the technical field of material science. Background technique [0002] Aluminum nitride has become an ideal circuit substrate material and Packaging materials for electronic devices. The synthesis methods of aluminum nitride mainly include direct nitriding of aluminum powder, carbothermal reduction, chemical vapor deposition, self-propagating combustion synthesis and microwave synthesis. The direct nitriding method of aluminum powder and the carbothermal reduction method have realized industrial production. The carbothermal reduction method has the characteristics of wide source of raw materials, low price and simple process, and the synthetic powder has great advantages in terms of purity, particle size and stability. [0003] The carbothermal reduction method is to react the mixture of alumina and carbon in a nitrogen flow for 4-10 hours at 16...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/072
CPCC01B21/0726
Inventor 冯月斌杨斌张笑杨保民
Owner KUNMING UNIV OF SCI & TECH
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