作　　者： ; ; ;

机构地区： 广东水利电力职业技术学院机械工程系

出　　处： 《材料热处理学报》 2008年第6期111-114,119,共5页

摘　　要： 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 phase transformation and thermal stability of Al2O3 during high-energy ball milling were investigated by means of X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The effect of CeO2 and ZrO2 additives on the phase transformation and thermal stability of Al2O3 during high-energy ball milling and annealing was also studied. The results show that with the increase of ball milling time, the grain size of AlE 03 powder decreases and part of γ-Al2O3 transforms to α-Al2O3 . After ball-milling for 30h and subsequently annealing at 850℃ , Al2O3 powder transforms completely to α-phase. However, with addition of CeO2 and ZrO2, the transformation of γ-Al2O3 to α-Al2O3 3 is restrained effectively during ball milling and the temperature for the phase transformation increases to above 1000℃ . The results demonstrate that the thermal stability of γ-Al2O3 powder is improved by the addition of CeO2 and ZrO2 .

关 键 词： 高能球磨 相变 和 热稳定性

领　　域： [化学工程]