Science of Sintering 2006 Volume 38, Issue 3, Pages: 223-229
https://doi.org/10.2298/SOS0603223S
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Geometrical and electrical properties of NTC polycrystalline thermistors vs. Changes of sintering parameters
Savić S.M. (Institute of Technical Sciences of SASA, Belgrade)
Aleksić O.S. (Center for Multidisciplinary Studies, Belgrade)
Nikolić P.M. (Institute of Technical Sciences of SASA, Belgrade)
Luković D.T. (Institute of Technical Sciences of SASA, Belgrade)
NTC thermistor powder was made of a Mn, Ni, Fe and Co oxide mixture calcinated at 1050°C / 60 min. The powder was milled in a ball mill down to an average particle diameter of 0.9 μm. Small disc shaped pills of the powder obtained were made by pressing with a pressure of 2.5 MPa. The pills were sintered in the temperature range of 900-1400 °C for 30-240 min. The volume and specific volume resistivity change were measured as a function of sintering conditions. Microstructure development was observed using a SEM microscope. Using the results obtained, optimization of sintering parameters was performed in order to determine optimal electrical properties of the selected thermistor composition.
Keywords: (Mn, Ni, Fe, Co)3O4, NTC thermistor, volume resistivity, microstructure