Abstract
In this paper, a new Pb-free negative temperature coefficient (NTC) thick film thermistor, based on Co 2.77 Mn 1.71 Fe 1.10 Zn 0.42 O 8 (CMFZ), containing Bi 2 O 3 -B 2 O 3 -SiO 2 -ZnO (BBSZ) glass frits were successfully fabricated using a spin coating technique. It is confirmed that the resistance of the samples, in the sintering temperature range of 850–1050 °C, generates significant changes due to the change in grain sizes. The room temperature resistance of thick film samples ranges from 118 kΩ to 370 kΩ, while the range of B 25/50 values is 4050–4225 K. Aging and analysis indicate that the appropriately increased sintering temperature enhances the stability of thick film samples. Based on the surface morphology, resistance consistency, and aging stability of the samples, the optimal sintering temperature was determined to be 1000 °C with the Δ R/R 0 less than 0.35% after aging at 125 °C for 700 h. These findings provide important guidance and significance for the development of the high stability thick film NTC thermistors at a lower sintering temperature. • Sintering temperature of thermistor can be reduced to 1000 °C after adding glass additives. • Aging drift rate of thick-film thermistor is less than 1% after 700 h of aging. • Sintering temperature is considered a key variable affecting aging stability. • Electrical properties are highly affected by sintering temperature.
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