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Sensors 2018, 18(11), 3982; https://doi.org/10.3390/s18113982

Thermal Treatment of Aerosol Deposited NiMn2O4 NTC Thermistors for Improved Aging Stability

1
Department of Functional Materials, Universität Bayreuth, 95440 Bayreuth, Germany
2
Vishay Electronic GmbH, Dr.-Felix-Zandman-Platz 1, 95100 Selb, Germany
3
Vishay Resistors Belgium BVBA, Twee Huizenstraat 37, 1140 Brussel, Evere, Belgium
*
Author to whom correspondence should be addressed.
Received: 23 October 2018 / Revised: 4 November 2018 / Accepted: 5 November 2018 / Published: 15 November 2018
(This article belongs to the Section Sensor Materials)
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Abstract

This paper examines the influence of a short-term thermal treatment of aerosol deposited negative temperature coefficient (NTC) thermistor films on the NTCR characteristics and their long-term stability with different electrode materials. An aerosol deposition of a spinel-based NiMn2O4 powder on alumina substrates with screen-printed AgPd and Au interdigital electrode structures was performed. The manufactured components of the typical size of 1206 were tempered in a moderate temperature range of 200 °C to 800 °C and aged for 1000 h at 125 °C in air. Based on R-T measurements in a high-precision silicone oil thermostat bath and high temperature XRD analyses, the influence of the thermal treatment was analyzed and discussed. A 60-min tempering at 400 °C proved to be optimal, as both the NTCR parameters and their ageing stability could be significantly improved. The findings are explained. View Full-Text
Keywords: aerosol deposition method (ADM); room temperature impact consolidation (RTIC); spinel ceramic; non-linear resistor; temperature sensor; long-term stability; NTCR aerosol deposition method (ADM); room temperature impact consolidation (RTIC); spinel ceramic; non-linear resistor; temperature sensor; long-term stability; NTCR
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Schubert, M.; Münch, C.; Schuurman, S.; Poulain, V.; Kita, J.; Moos, R. Thermal Treatment of Aerosol Deposited NiMn2O4 NTC Thermistors for Improved Aging Stability. Sensors 2018, 18, 3982.

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