A Spray Processed Polymer-Based High Temperature Organic/Metal Thermocouple for Embedding in Organic Coatings of Steel Substrates
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In this work we present the realization of a fully spray processed embedded temperature
sensor. The sensing element is a thermocouple made of conductive materials which are high
temperature stable polymer based paints with organic or metallic filler particles. The thermocouple
is embedded in an organic paint layer which shows, besides good high temperature properties up
to 250 °C, excellent mechanical and chemical stability. The manufactured thermocouples are tested
up to a junction temperature of 250 °C, first without and afterwards with an encapsulation layer.
The measured output voltage for a terminal temperature of 25 °C and a junction temperature of
250 °C is in the region of 4.23 mV before and after top coating. Finally, a layer analysis of the
encapsulated device is made using a cross-section polish.