Novel synthesis of fine γ-AlON powders from the hydrolysis of Al metal
In this study, fine aluminum oxynitride (γ-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 AlO...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Tsinghua University Press
2024-11-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9220984 |
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| Summary: | In this study, fine aluminum oxynitride (γ-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 °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. |
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| ISSN: | 2226-4108 2227-8508 |