Abstract
Aluminum oxynitride (AlON) powders were synthesized using the raw materials of γ-Al2O3 and carbon black through the carbothermal reduction and nitridation process. The carbon content in the γ-Al2O3/C mixture and heating temperature were investigated. The AlON powders were synthesized by calcination for 2h at 1750°C when the carbon content in the γ-Al2O3/C mixture was 5.8wt%. The particle size of powder is important to the transparency of ceramics, but the size of the synthesized powder was large. Therefore, a few methods, such as freeze-drying, ultrasonic dispersion, and liquid nitrogen ball milling, were used to reduce the particle size of powders. Among the three methods, liquid nitrogen milling had the best results.
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