Densification and sintering dynamics of 10NiO-NiFe2O4 composites doped with CaO
来源期刊:中南大学学报(英文版)2007年第5期
论文作者:李劼 张刚 赖延清 张勇 田忠良
文章页码:629 - 629
Key words:aluminum electrolysis; inert anode; CaO doping; densification; sintering dynamics
Abstract: The effects of CaO content in the range from 0 to 4.0%, and sintering temperature on the phase composition, relative density and electrical conductivity of 10NiO-NiFe2O4 composites doped with CaO were studied. The results show that there is no change of structure for NiO or NiFe2O4; there is apparent oxygen absorbing and releasing behavior during the heating process in air for 10NiO-NiFe2O4 composites. Introduction of CaO can accelerate the densification of 10NiO-NiFe2O4 composites. The maximum value of relative density is 98.75% for composite doped with 2.0% CaO and sintered at 1 200 ℃, which is beyond about 20% for the undoped composites. The sintering activated energy of sample containing 2% CaO decreases by 15.87 kJ/mol, compared with that of the undoped sample.
基金信息:the National Key Fundamental Research and Development Program of China
the National Natural Science Foundation of China
the Natural Science Foundation of Hunan Province, China