Abstract
Ceramic LaNiO 3 samples were prepared by solid state reaction method at different sintering temperatures. It was found that the resultant was not ABO 3 perovskite single phase but dual phase La 2NiO 4 and NiO, and the percentage of the two phases varied with sintering temperature. Ceramics sintered at 1400 °C were well crystallized and the phase ratio of La 2NiO 4 was the maximum. The surface morphology observed by scanning electron microscopy (SEM) indicated that the grains of the ceramics sintered at 1400 °C were uniform and compact, which were in agreement with the properties of high density and low electrical resistivity of the samples. X-ray diffraction (XRD) patterns of ceramics before and after arc erosion indicated their high structural stability, which resulted in the good arc erosion resistance properties for silver-based electrical contact materials. The contact materials prepared with the ceramic sintered at 1400 °C exhibited better mass transition and arc erosion resisting properties.
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