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Effect of MnO2 Addition on Sintering Properties of 18NiO-NiFe2O4 Composite Ceramics: Preliminary Results

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Abstract

NiFe2O4 samples with small amounts of MnO2 were prepared via ball-milling process and two-step sintering process from commercial powders. Sintered density, average grain size, and microstructure of Mn-doped 18NiO-NiFe2O4 composite ceramics have been investigated by means of x-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. Bending strength was measured by three-point method. The results show that the crystalline structures of the ceramic matrix are still NiFe2O4 spinel structure and Mn ions homogeneously distribute in both the grains interiors and the grain boundaries. When 1 wt.% MnO2 was added, the values of relative density and bending strength of composite ceramics reached their respective maximum of 93.6% and 38.75 MPa, respectively. It is preliminarily found that MnO2 can reduce the sintering temperature obviously because of partial substitution of Fe3+ with Mn4+ in NiFe2O4 lattice.

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Acknowledgments

The authors gratefully acknowledge the financial support from the State Key Program of National Natural Science of China (No. 50834001) and National High Technology Research and Development Program of China (863 Program) (No. 2009AA03Z502).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, P.O. Box 117, Shenyang, 110004, China

    Jinjing Du, Yihan Liu, Guangchun Yao & Zhigang Zhang

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  1. Jinjing Du
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  2. Yihan Liu
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  3. Guangchun Yao
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Correspondence to Jinjing Du.

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Du, J., Liu, Y., Yao, G. et al. Effect of MnO2 Addition on Sintering Properties of 18NiO-NiFe2O4 Composite Ceramics: Preliminary Results. J. of Materi Eng and Perform 21, 1998–2001 (2012). https://doi.org/10.1007/s11665-011-0113-z

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  • DOI: https://doi.org/10.1007/s11665-011-0113-z

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