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Method for synthesizing high performance aluminium nitride powder

An aluminum nitride and new method technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of increasing the difficulty and intensity of post-processing processes, incomplete synthesis reactions, and increased production costs, and achieves the goal of forming The appearance and composition are uniform, the reaction speed is fast, and the production cost is reduced.

Inactive Publication Date: 2004-11-10
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0004] Some researchers use various additives to obtain ultrafine, low-oxygen aluminum nitride powders (patent application numbers: 95111719, 98100685, 00134191), however, most of the currently synthesized aluminum nitride powders are Completed in the laboratory, the production volume is very small, and there is serious stratification in the synthesized powder
In actual industrial production, due to the large amount of cloth at one time, the nitrogen must pass through the thick powder, so there must be inhomogeneity, especially in the lower half of the ingredients, the synthesis reaction is always incomplete due to insufficient nitrogen supply, so it is different from the above. The half part has obvious differences in color and composition, resulting in a low yield of fully nitrided powder, and the separation of different quality powders also increases the difficulty and intensity of the post-processing process, which increases the overall production cost

Method used

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  • Method for synthesizing high performance aluminium nitride powder
  • Method for synthesizing high performance aluminium nitride powder

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Dilute 1.56Kg aluminum powder, 2.4Kg aluminum nitride and 40g NH 4 F mix, add 1.5Kg of absolute ethanol, ball mill on a barrel ball mill for 10 hours, and then dry in vacuum. The dried powder is sieved and then put into a high-pressure synthesis reactor. After the reaction kettle is evacuated, it is filled with high-purity nitrogen to 8MPa, and it is ignited to initiate a self-propagating combustion synthesis reaction of aluminum powder. After the reaction starts, NH is evenly introduced from the bottom of the reaction material 3 , To the end of the combustion reaction. The characteristics of the synthesized powder are shown in Table 1 below:

Embodiment 2

[0018] Dilute 1.52Kg aluminum powder, 2.4Kg aluminum nitride and 80g NH 4 Cl was mixed, 1.5Kg of absolute ethanol was added, ball milled on a barrel ball mill for 10 hours, and then dried in a vacuum. The dried powder is sieved and then put into a high-pressure synthesis reactor. After the reaction kettle is evacuated, it is filled with high-purity nitrogen to 8MPa, and it is ignited to initiate a self-propagating combustion synthesis reaction of aluminum powder. After the reaction starts, NH is evenly introduced from the bottom of the reaction material 3 , To the end of the combustion reaction. The characteristics of the synthesized powder are shown in Table 2 below:

[0019] Upper half

[0020] Upper half

[0021] It can be seen from the above results that because the upper and lower parts are uniform in color, particle size, morphology and composition, the yield of qualified products is increased, the separation process in post-processing is reduced, a...

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Abstract

The present invention belongs to the technology field of electrically insulating material preparation, which is a novel process for synthesizing high-performance aluminum nitride powder by utilizing the self-spreading combustion for synthesis, wherein thinning agent and addition agent are charged into the raw material aluminum dust, and are ground by rotary mill, then they are charged into a combustion synthesis reaction apparatus, nitrogen is charged under coarse vacuum, ignition composition is ignited and ammonia gas is charged simultaneously, thus aluminum nitride powder is synthesized from the raw aluminum dust.

Description

Technical field [0001] The invention belongs to the technical scope of the preparation of electrical insulating materials, and particularly relates to a new method for synthesizing high-performance aluminum nitride powder by self-propagating combustion. Background technique [0002] With the rapid development of microelectronics technology, substrates used as electrical insulating materials are required to have higher thermal conductivity and excellent dielectric properties. Because aluminum nitride has the advantages of high thermal conductivity, thermal expansion coefficient matching with silicon, low dielectric constant, low dielectric loss, and non-toxicity, it has a wide range of application potential in power electronics, electronic information and other fields. Therefore, the synthesis of high-performance aluminum nitride powder has also become the focus of research. At present, the commercialized aluminum nitride powder synthesis processes mainly include direct nitridatio...

Claims

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Application Information

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IPC IPC(8): C01B21/072C04B35/584C04B35/64
Inventor 乔梁周和平林友荣冯泽松
Owner TSINGHUA UNIV
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