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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 9/2012

01-09-2012

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

Authors: Jinjing Du, Yihan Liu, Guangchun Yao, Zhigang Zhang

Published in: Journal of Materials Engineering and Performance | Issue 9/2012

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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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Metadata
Title
Effect of MnO2 Addition on Sintering Properties of 18NiO-NiFe2O4 Composite Ceramics: Preliminary Results
Authors
Jinjing Du
Yihan Liu
Guangchun Yao
Zhigang Zhang
Publication date
01-09-2012
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 9/2012
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-011-0113-z

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