摘要
本文研究了高能球磨以及碳热还原反应加热过程中Al2O3相结构的变化,及其对碳热还原反应活性的影响。不同相结构Al2O3碳热还原反应活性差别很大,-γAl2O3是其中反应活性最好的。随着球磨时间的延长和加热温度的提高,粉末中发生了-γAl2O3→-αAl2O3的转变,这一点对于降低碳热还原反应激活能是不利的。高能球磨20小时,Al2O3部分非晶化,而且有立方结构AlN生成,这两个现象属于首次报道。碳热还原反应加入的活性炭粉,能够抑制加热过程中的-γAl2O3→-αAl2O3相变,有效地保证了粉末的反应活性。
The crystal structure conversion and reactivity of Al2O3 during high-energy ball milling was investigated in this paper. γ-Al2O3, which with high reaction activation transforms to α-Al2O3 along with ball milling and heating up process. After 20 hours milling, amorphous and AIN were observed in powder, these have not been reported previously. The active carbon powder added for carbothermal reduction restrains the phase transformation of γ-Al2O3, and preserves the reactivity effectively.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2006年第3期325-329,共5页
Journal of Materials Science and Engineering
基金
高等学校博士点基金资助项目(20040698053)
教育部科学技术研究重点资助项目(105159)
关键词
氧化铝
晶体结构
反应活性
高能球磨
alumina
crystal structure
reactivity
high energy ball milling
