Properties of Multilayer NTC Perovskite Thermistors Prepared by Tape Casting, Lamination and Cofiring

Jan Kulawik; Dorota Szwagierczak

doi:10.4028/www.scientific.net/KEM.605.507

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 605Properties of Multilayer NTC Perovskite...

Properties of Multilayer NTC Perovskite Thermistors Prepared by Tape Casting, Lamination and Cofiring

Abstract:

The paper reports on processing and characterization of multilayer NTC (negative temperature coefficient) perovskite thermistors. Three materials La_0.8Sr_0.2Ti_0.4Fe_0.6O₃, CaTi_.0.8Co_0.2O₃ and CaTi_0.9Y_0.1O₃with the stable perovskite structure were synthesized by solid state reactions and used for preparation of slurries for tape casting. Green sheets with screen printed internal Pt electrodes were stacked, laminated isostatically and cofired at 1250-1350°C. SEM observations revealed dense, fine-grained microstructure of ceramic layers, lack of delaminations and cracks and a good cooperation between ceramic and Pt electrode layers. Resistance-temperature characteristics of the fabricated multilayer thermistors were measured in the temperature range 20-820°C. The temperature coefficients of resistance were high, ranging from-9.7 to-1%/°C. Two developed compositions CaTi_.0.8Co_0.2O₃ and CaTi_0.9Y_0.1O₃ were found to be suitable for use at a higher temperature range of 150-500°C. The endurance tests showed small resistance changes (below 1%) after long term ageing at 300-400°C.

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Periodical:

Key Engineering Materials (Volume 605)

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507-510

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.605.507

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Online since:

April 2014

Authors:

Jan Kulawik, Dorota Szwagierczak

Keywords:

Multilayer NTC Thermistor, Perovskite Ceramics, Tape Casting, Temperature Coefficient of Resistance

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