摘要
采用恒温烧结方式在900—1200℃范围内研究了粒径为10nm、团聚体强度分别为76和234MPa的α-Al2O3纳米粉初期烧结致密化过程.结果表明,两种粉体在烧结初期阶段均受品界扩散控制,其晶界扩散激活能分别为354和481kJ/mol,并对α-Al2O3纳米粉在实验温度范围内的晶界扩散系数进行了估算.
Isothermal sintering method was used to study the initial stage sintering of a soft and a hard agglomerated α-Al2O3 powder with a diameter of 10 nm. For both powders the initial stage sintering was found to be controlled by grain boundary diffusion. Activation energies of grain boundary diffusion of the soft and the hard agglomerated powders were determined to be 354 and 481 kJ/mol respectively and the diffusion coefficient of the soft agglomerated α-Al2O3powder from 900 to 1200 ℃ was estimated.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第2期189-194,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金!59502007
辽宁省自然科学基金
关键词
纳米粉末
怛温烧结
晶界扩散
氧化铝
陶瓷
alumina
ultrafine powder
isothermal sintering
grain boundary decision
activation energy