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运用XRD、SEM等方法研究了Al2O3在高能球磨过程中的相结构转变及其耐热性能,研究了CeO2和ZrO2添加剂对Al2O3高能球磨和焙烧过程中的组织和热稳定性的影响。结果表明,随着球磨时间的延长,Al2O3粉末不断被细化,同时也发生了部分γ-Al2O3→α-Al2O3的转变;而且,经30h球磨的Al2O3在850℃下退火处理后就全部转变成α相。然而,当添加一定量的CeO2和ZrO2后,在球磨过程中γ-Al2O3→α-Al2O3的转变得到了有效的抑制,Al2O3在焙烧过程中的相变温度也提高到了1000℃以上,即CeO2和ZrO2的添加提高了γ-Al2O3的热稳定性。
The transformation of phase structure and heat resistance of Al2O3 during high energy ball milling were studied by XRD and SEM. The effects of CeO2 and ZrO2 additives on the microstructure and thermal stability of Al2O3 high energy ball milling and roasting process were studied. The results show that with the milling time increasing, the Al2O3 powder is continuously refined and some γ-Al 2 O 3 → α-Al 2 O 3 transitions occur at the same time. In addition, Al2O3 powder after ball milling at 30h is annealed at 850 ℃ α phase. However, when a certain amount of CeO2 and ZrO2 were added, the transformation of γ-Al2O3 → α-Al2O3 was effectively suppressed during the ball milling. The transformation temperature of Al2O3 during the calcination also increased to over 1000 ℃, that is, CeO2 and The addition of ZrO2 improves the thermal stability of γ-Al2O3.