Geometrical and electrical properties of NTC polycrystalline thermistors vs. Changes of sintering parameters
AuthorsSavić, Slavica M.
Aleksić, Obrad S.
Nikolić, Pantelija M.
ContributorsRistić, Momčilo M.
Article (Published version)
MetadataShow full item record
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 thermistors / volume resistivity / microstructure / ball milling
Source:Science of Sintering, 2006, 38, 3, 223-229
- Belgrade : International Institute for the Science of Sintering