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Fabrication and characteristics of NTC thermistor for low temperature sintering

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2018, 28(1), pp.28-37
  • DOI : 10.6111/JKCGCT.2018.28.1.028
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Published : February 28, 2018

Bonkeup Koo 1

1한밭대학교

Accredited

ABSTRACT

In order to study the NTC thermistor that can be fired at low temperature, the influence of the lead free glass frit and RuO2 addition on the electrical properties of the NTC thermistor of Mn1.85Ni0.25Co0.9O4 basic composition was studied. The sintering characteristics of the specimen sintered at 1000 o C with 10 wt% frit added to the basic NTC composition were similar to those of the specimen sintered at 1200 o C without frit. However, as the amount of frit increased, the electrical resistivity and B constant were increased. In order to reduce the resistance, NTC thermistor was prepared by adding 0, 2, and 5 wt% of RuO2 to the composition containing 10 wt% of frit and sintered at 1000~1200 o C, and sintering and electrical properties were measured. The electrical resistivity and the B constant tended to decrease with increasing RuO2 content. However, the resistivity was the lowest at sintering temperature of 1000 o C and the resistance increased with increasing sintering temperature after 5 wt% RuO2 addition. The NTC thermistor sintered at 1000 o C with 10 wt% frit and 5 wt% RuO2 in the composition of NTC showed similar electrical properties and sintering characteristics when sintered at 1200 o C without added frit.

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