摘要
采用湿化学法在超声场中制备了纳米α-Al_2O_3粉体,研究了超声辐射作用下前驱体颗粒的成核、长大过程,探索了超声作用下Al_2O_3晶型的转变。结果表明:超声能量能加速前驱体的形核,超声分散可控制晶核的长大和团聚,在超声技术处理下可制备粒径仅为20 nm的NH_4Al(OH)_2CO_3超细前驱体,这一前驱体经8 h陈化后,再经1150℃高温煅烧20 min,可制备得到粒径约为10 nm的α-Al2O3粉体;研究还发现高频率超声辐射可提高α相Al_2O_3粉体的结晶度。
α-Al2O3 powder was synthesized by a wet chemical reaction in the ultrasonic field. The effects of ultrasonication on the formation of their precursor and the nucleation and growth of the alumina powders were studied. The supersonic energy accelerated the nucleation of the precursor. The ultrasonication had large effects on the growth and agglomerating of the crystal nucleus. The precursor sized was 20 nm. The α-phase alumina powder derived from the precursor by aging for 8 h and calcining at 1150 ℃ for 20 min was highly crystallized of 10 nm in diameter. Moreover, the temperatures for the formation of alumina lowered with the increase of the ultrasonic frequency.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期63-65,共3页
Rare Metal Materials and Engineering
基金
江苏大学博士创新基金资助
关键词
超声辐射
Al2O3粉末
制备
supersonic radiation
alumina powders
preparation
