Sensors 2018, 18(11), 3982; https://doi.org/10.3390/s18113982
Thermal Treatment of Aerosol Deposited NiMn2O4 NTC Thermistors for Improved Aging Stability
Michaela Schubert 1, Christian Münch 2, Sophie Schuurman 3, Véronique Poulain 3, Jaroslaw Kita 1 and Ralf Moos 1,*
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)
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-TextKeywords:
aerosol deposition method (ADM); room temperature impact consolidation (RTIC); spinel ceramic; non-linear resistor; temperature sensor; long-term stability; NTCR
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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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