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Method for synthesizing high performance aluminium nitride powder

An aluminum nitride, high-performance technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as increasing the difficulty and strength of post-processing processes, incomplete synthesis reactions, and increasing production costs, and achieves a high quality The appearance and composition are uniform, the reaction speed is fast, and the production cost is reduced.

Inactive Publication Date: 2005-12-28
TSINGHUA UNIV
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  • Application Information

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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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dilute 1.56Kg aluminum powder, 2.4Kg aluminum nitride and 40g NH 4 F mixing, adding 1.5Kg of absolute ethanol, ball milling on a barrel ball mill for 10h, and then drying in vacuum. The dried powder is sieved, and then loaded into a high-pressure synthesis reactor. After vacuumizing the reactor, fill it with high-purity nitrogen to 8MPa, and ignite to trigger the self-propagating combustion synthesis reaction of aluminum powder. After the reaction starts, uniformly feed NH from the bottom containing the reaction materials 3 , until the end of the combustion reaction. The characteristics of the synthesized powder are shown in Table 1 below:

[0015] Upper half

Embodiment 2

[0017] 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 h, and then dried in vacuum. The dried powder is sieved, and then loaded into a high-pressure synthesis reactor. After vacuumizing the reactor, fill it with high-purity nitrogen to 8MPa, and ignite to trigger the self-propagating combustion synthesis reaction of aluminum powder. After the reaction starts, uniformly feed NH from the bottom containing the reaction materials 3 , until the end of the combustion reaction. The powder characteristics of synthesis are as shown in Table 2 below:

[0018] Upper half

[0019] It can be seen from the above results that because the color, particle size, shape and composition of the upper and lower parts are uniform, the yield of qualified products is improved, and the separation process in post-processing is simplified, thereby greatly reducing the cost. Repea...

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Abstract

The invention discloses a method for synthesizing high-performance aluminum nitride powder by self-propagating combustion synthesis, which belongs to the technical scope of electrical insulation material preparation. Add diluent and additives to the raw aluminum powder, then ball mill it on a rolling ball mill, and then put it into a combustion synthesis reaction device. Under low vacuum, fill nitrogen, ignite the ignition agent, and fill ammonia gas at the same time to make the raw aluminum powder Combustion synthesis of aluminum nitride powder. The aluminum nitride powder synthesized by the method has uniform color, no stratification, no sandwich, simple post-treatment process and high production efficiency.

Description

technical field [0001] The invention belongs to the technical scope of electrical insulating material preparation, and in particular relates to a method for synthesizing high-performance aluminum nitride powder by self-propagating combustion. Background technique [0002] With the rapid development of microelectronics technology, substrates 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 that of silicon, low dielectric constant, low dielectric loss, and non-toxicity, it has wide 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 synthesis processes of aluminum nitride powder that have been successfully commercialized mainly include the ...

Claims

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Application Information

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