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Novel synthesis of fine γ-AlON powders from the hydrolysis of Al metal
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DOI：10.26599/JAC.2024.9220984.png)
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Abstract
En 中文
In this study, fine aluminum oxynitride (gamma-AlON) powder was synthesized from a solid-state hydrolysis byproduct for the first time through in-depth research on the hydrolysis of metal Al powder. Hydrolysis begins on the surface of the Al particles, the initial solid-state hydrolysis byproduct is AlOOH and then Al(OH)3, and during the reaction stage, a unique core-shell structure with a hollow outer core composite precursor is formed. Pure-phase AlON powder can be synthesized by utilizing a composite precursor with an appropriate Al2O3/Al ratio (Al2O3/Al = 10.27) under a flowing N2 atmosphere. The core-shell structure decreases the diffusion distance between raw materials and reduces the nitridation temperature (1700 degrees C). Furthermore, the unique hollow structure of the composite precursor results in some of the synthesized AlON powder also having a hollow structure, which is conducive to powder crushing, and fine nanoscale (D50 = 292 nm) powder can be obtained only via a grinding process. The combination of Al-H2O reaction and direct nitridation (DN) methods has led to the development of a new synthesis method for AlON powder and provides a new method for the recovery of the solid-state hydrolysis byproduct of metal Al powder.
Keywords:
hydrolysis
aluminum oxynitride (gamma-AlON)
core-shell structure
Al-H 2 O reaction
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