Densification and sintering dynamics of 10NiO-NiFe2O4 composites doped with CaO

Jie Li; Gang Zhang; Yan-qing Lai; Yong Zhang; Zhong-liang Tian

doi:10.1007/s11771-007-0120-2

Journal of Central South University ›› 2007, Vol. 14 ›› Issue (5) : 629 -632. DOI: 10.1007/s11771-007-0120-2

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Densification and sintering dynamics of 10NiO-NiFe₂O₄ composites doped with CaO

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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 °C, 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.

Keywords

aluminum electrolysis / inert anode / CaO doping / densification / sintering dynamics

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Jie Li, Gang Zhang, Yan-qing Lai, Yong Zhang, Zhong-liang Tian. Densification and sintering dynamics of 10NiO-NiFe₂O₄ composites doped with CaO. Journal of Central South University, 2007, 14(5): 629-632 DOI:10.1007/s11771-007-0120-2