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http://dx.doi.org/10.6111/JKCGCT.2021.31.5.218

Effect of lead-free frit and RuO2 on the electrical properties of thick film NTC thermistors for low temperature co-firing  

Koo, Bon Keup (Department of Materials Science and Engineering, Hanbat National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.31, no.5, 2021 , pp. 218-227 More about this Journal
Abstract
A thick film NTC thermistor for low temperature co-firing was manufactured by printing and sintering a paste prepared using NTC powder of Mn1.5Ni0.4Co0.9Cu0.4O4 composition, lead free frit, and RuO2 on a 96 % alumina substrate. The effect of frit and RuO2 on the electrical properties of thick film NTC thermistor was studied. The resistance of the thick film NTC thermistor was higher than that of the bulk phase sintered at the same temperature, but it was found that the negative resistance temperature characteristic appeared more clearly and linearly in the resistance - temperature characteristic. On the other hand, the area resistance decreased as the sintering temperature increased, and the area resistance increased as the amount of frit added increased. The B constant of the thick film NTC thermistor was 3000 K or higher. Among them, it was found that the B constant of the thick film NTC thermistor made of paste with 5 wt% of frit added and sintered at 900℃ showed the highest B constant. Also, it can be seen that the area resistance decreased with the addition of RuO2, and the change in the area resistance decrease of the thick film NTC thermistor obtained by sintering the paste containing 5 wt% of RuO2 at 900℃ is the most obvious.
Keywords
Thick film NTC thermistor; Low temperature co-firing; Lead free frit; Ruthenium oxide; Microstructure;
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