A method for producing an aluminum nitride powder

By pretreating spherical aluminum powder, performing segmented heating nitriding, and multiple acid washing processes, the problems of aluminum powder melting and sintering and oxide film residue in the nitriding reaction were solved, thus achieving the preparation of high-purity aluminum nitride powder.

CN122079090APending Publication Date: 2026-05-26NINGXIA NORTH PORCELAIN NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202610078629.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-21
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing methods for preparing aluminum nitride powder, the nitriding reaction causes local temperatures to exceed the melting point of aluminum, resulting in hard agglomerates. Furthermore, the oxide film on the surface of the aluminum powder is difficult to remove completely, affecting the purity of the product.

Method used

High-purity spherical aluminum powder is used for pretreatment to remove the oxide film. The reaction is then controlled by multiple treatments, including segmented heating nitriding, air jet milling, and dilute hydrochloric acid immersion, to ensure uniform reaction and purity.

Benefits of technology

This effectively avoids the melting and sintering of aluminum powder, which would otherwise form large particles, thus improving the purity and dispersibility of aluminum nitride powder and ensuring the quality of the preparation.

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Abstract

This invention discloses a method for preparing aluminum nitride powder, comprising the following steps: S1: Selecting spherical aluminum powder with a purity ≥99.9% and pre-treating it; S2: Spreading the pre-treated aluminum powder evenly in a boron nitride crucible, with a layer thickness ≤5mm to avoid incomplete internal reaction; S3: Placing the crucible in a tube furnace and purging the furnace with high-purity nitrogen to replace the air inside; S4: Heating the aluminum powder treated in S3 in stages for nitriding, and then cooling it for later use; S5: The cooled powder exhibits agglomeration, so it is lightly dispersed using an air jet mill and then sieved; S6: Immersing the powder again in 10% hydrochloric acid for 100-120 minutes, washing it with water until neutral, and then vacuum drying to obtain aluminum nitride powder. This invention utilizes dilute hydrochloric acid of different concentrations to immerse the aluminum nitride twice, which removes the aluminum oxide film on the surface of the aluminum powder. By destroying the oxide film on its surface, the nitriding reaction is hindered, effectively preventing the aluminum powder from melting and sintering to form large particles.
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