Abstract
xNi/10NiO-NiFe2O4 (x=5, 10, 17) cermets and those doped with 1% BaO (mass fraction) were prepared by cold isostatic pressing at 200 MPa and sintering in nitrogen atmosphere at 1 473 K. The effects of BaO addition on relative density, microstructure and electric conductivity of cermets were investigated. The results show that relative densities of xNi/10NiO-NiFe2O4 cermets (x=5, 10, 17) doped with 1% BaO at 1 473 K in nitrogen atmosphere are increased by 0.49%, 1.45% and 2.99% compared with those of the undoped BaO cermets, respectively. Moreover, the electric conductivities (21.98, 28.37 and 50.10 S/cm) of xNi/10NiO-NiFe2O4 cermets (x=5, 10, 17) doped with 1% BaO at 1 233 K are improved compared with those (18.70, 22.79 and 39.58 S/cm) of xNi/10NiO-NiFe2O4 cermets (x=5, 10, 17), respectively. This indicates that perhaps the addition of BaO or formation of BaFe2O4 and Ba2Fe2O5 has an active effect on electric conductivities of xNi/10NiO-NiFe2O4 (x=5, 10, 17) cermets.
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Foundation item: Project(2005CB623703) supported by the National Basic Research Program of China; Project(50721003) supported by the National Natural Science Fund for Innovation Group of China; Project(2008AA030501) supported by the National High-Tech Research and Development Program of China
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He, Hb., Li, Zy., Zhou, Kc. et al. Effect of BaO addition on relative density and electric conductivity of xNi/10NiO-NiFe2O4 cermets. J. Cent. South Univ. Technol. 16, 703–707 (2009). https://doi.org/10.1007/s11771-009-0116-1
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DOI: https://doi.org/10.1007/s11771-009-0116-1