Description:
<jats:p>A powder of Cu0.2Ni0.5Zn1.0 Mn1.3O4 composition for custom thermistor was
prepared by using the respective mixture of metal oxides and solid state
reaction at 1000 ?C/4h in air. The obtained thermistor powder was milled in
the planetary ball mill and agate mill for a prolonged time to achieve
submicron powder. The prepared thermistor powder was further characterized
by using XRD and SEM techniques. After that, the thermistor powder was
pressed into small disc-shaped samples and sintered at 1150 ?C/2h. The
sintered samples were also characterized by using XRD and SEM. The main
electrical properties such as nominal resistance R and thermistor
exponential factor B were measured in the climatic test chamber. After that,
the thick film paste was prepared using the same powder, an organic vehicle
and a glass frit. The paste was printed on alumina substrate, dried at 150
?C /30 min and sintered in air at 850 ?C /10 min in a hybrid conveyor
furnace. Planar electrodes were printed on the sintered NTC thermistor layer
using PdAg thick film paste. The electric properties of the sintered thick
film thermistor were also measured in the climatic test chamber. The
obtained results were used for development of novel self-heating thermistor
applications.</jats:p>