Aluminum oxynitride by SHS under high pressure of nitrogen gas

Aluminum oxynitride by SHS under high pressure of nitrogen gas

Aluminum oxynitride (γ-AlON) powders were prepared from low-caloric Al–Al 2 O 3 mixtures by SHS under high pressure of nitrogen gas in the presence of heat-generating agent, Mg(ClO 4 ) 2 , as a booster. The preparation procedure was characterized and optimized with respect to Al/Al 2 O 3 ratio, amou...

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Veröffentlicht in:International journal of self-propagating high-temperature synthesis 2017-04, Vol.26 (2), p.110-114
Hauptverfasser: Akopdzhanyan, T. G., Borovinskaya, I. P., Chemagina, E. A.
Format: Artikel
Sprache:eng
Schlagworte:
Aluminum
Aluminum oxide
Ceramic powders
Ceramics
Chemistry and Materials Science
Disintegration
Gas pressure
Helium
Materials Science
Nitrogen
Self-propagating synthesis
Sintering
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Zusammenfassung:Aluminum oxynitride (γ-AlON) powders were prepared from low-caloric Al–Al 2 O 3 mixtures by SHS under high pressure of nitrogen gas in the presence of heat-generating agent, Mg(ClO 4 ) 2 , as a booster. The preparation procedure was characterized and optimized with respect to Al/Al 2 O 3 ratio, amount of heatgenerating additive, and nitrogen gas pressure. The morphology of synthesized γ-AlON powders was found to depend on Al powder brand. Compared to γ-AlON powders obtained in chemical furnace, we managed to prepare less sintered arenaceous cakes that could be easily disintegrated into target γ-AlON powder. SHSproduced powders may find their application in production of optical ceramics.
ISSN:1061-3862
1934-788X
DOI:10.3103/S1061386217020029