Long-Term Mechanical Reliability of Ceramic Thick-Film Circuits and Mechanical Sensors Under Static Load

Recently, high-strength zirconia-toughened alumina (ZTA) ceramic substrates have attracted interest, because they offer much improved mechanical properties over straight alumina, while maintaining advantages such as good thermal conductivity and chemical stability. This allows their application in high-power electronics and piezoresistive thick-film sensors, where the substrate is subjected to considerable stress. This work examines the impact of processing a range of thick film materials (Ag- and Au-based conductors, and a resistor material widely used in piezoresistive sensors) on the short- and long-term strength of ZTA, as compared to the standard 96% alumina used in thick-film electronics. It is found that many layers substantially reduce the substrate strength, especially in the long term, which is related to enhanced crack growth in the presence of glassy layers. These findings have pronounced implications in piezoresistive sensor design.


Published in:
Procedia Engineering, 25, 164-167
Presented at:
Eurosensors XXV, Athens (GR), 4-7.9.2011
Year:
2011
Publisher:
Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa
Keywords:
Note:
Fiabilité mécanique sous charge statique des substrats en couches épaisses, et comment elle est affectée par la présence des couches épaisses, notamment des conducteurs frittés Ag:Pd.
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2012-06-03, last modified 2018-01-28

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