Article ID Journal Published Year Pages File Type
1615014 Journal of Alloys and Compounds 2013 7 Pages PDF
Abstract

NiFe2O4 ceramics reinforced with ZrO2 particle was fabricated by conventional high-temperature solid state reaction. Effect of the sintering temperature (1100–1500 °C) on the microstructure and mechanical properties of the ZrO2/NiFe2O4 composite ceramics was investigated in detail. The fracture surfaces of NiFe2O4 composite ceramics were observed by scanning electron microscopy (SEM). Elemental analysis of micro-structural phases was performed using energy dispersive spectroscopy (EDS), attached with SEM. Flexural strength by three-point bending techniques and fracture toughness were measured. It was indicated that when the sintering temperature was above 1400 °C, phase transformation causing crack can directly lead to the strength degradation. The grain size of ZrO2 increases with increasing of the sintering temperature. The samples sintering at 1400 °C had the highest flexural strength of 192 ± 10 MPa and fracture toughness of 3.38 ± 0.05 MPa m1/2 due to densification, phase transformation.

► ZrO2/NiFe2O4 composite ceramics were synthesized by powder metallurgy methods. ► The microstructure was investigated at different sintering temperatures. ► The grain size increases with increasing of the sintering temperature. ► The composite ceramics sintering at 1400°C show superior mechanical properties. ► Main toughening mechanisms are densification, phase transformation toughening.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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