Method for synthesizing high performance aluminium nitride powder

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...

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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

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