Abstract: Transparent γ-AlON ceramics have the advantages of high hardness, good chemical resistance and high optical transmittance, and have extensive application prospects in national defense and commercial fields. Whereas, high-purity single-phase γ-AlON powders with less agglomeration, uniform distribution of particle size are critical in sintering highly transparent γ-AlON ceramics. In this paper, Al2O3-AlN phase diagrams and thermodynamic calculation results of γ-AlON are briefly introduced. And then, the research progress of γ-AlON powders synthesized by high temperature solid-state reaction, aluminothermic reduction nitridation, and carbothermal reduction nitridation, respectively, is reviewed. Finally, the future synthesis technologies for γ-AlON powder with <100 nm size are proposed.
Key words: aluminum oxynitride, powder synthesis, high temperature solid-state reaction, aluminothermic reduction nitridation, carbothermal reduction nitridation
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