研究了高能球磨过程中Al2O3的相变, 随着球磨时间的延长, 粉末中发生了γ -Al2O3向α -Al2O33的转变. 高能球磨20h, Al2O3部分非晶化, 同时, 有立方AlN生成. 增加球磨强度, 立方AlN生成量增加, 650r/min高能球磨40h, AlN生成量达到72%. 随后的氮气气氛退火实验发现, 在500℃以上, 立方氮化铝与氧化铝反应, 生成AlON相. AlON相的生成, 有效地降低了碳热还原氮化反应激活能.
The phase conversion of Al2O3 during high-energy ball milling was investigated. After 20h milling, amorphous and AlN were observed in powders, these were not reported previously. The crystal structure of AlN gained during ball milling is cubic, differs from that of the regular hexagonal AlN synthesized with carbothermal reduction. AlON phase forms by the reaction of cubic AlN and γ-Al2O3 after annealing in N2 atmosphere at the temperature above 500℃. The formation of AlON phase decreases the commencing temperature of AlN.
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