Piezoresistive effect in epoxy-graphite composites
In this work, we investigate the piezoresistive response of epoxy-graphite composites. A resistive thick-film Wheatstone bridge is deposited by screen-printing onto an alumina beam, a weight is then applied on the tip of the beam and the resulting electrical signal response is recorded, allowing the calculation of the gauge factor. The characterization was made at room temperature, 60°C and 100°C for different matrixes (epoxies with different glass transition temperatures, Tg) and particles sizes (4 μm and 15 μm). The creep of the signal in time and temperature was also observed. The present work shows also the tremendous effect of Tg on piezoresistive behavior: the high Tg epoxy demonstrating better stability in time and temperature than the other one.
Keywords: capteurs piézorésistifs ; piezoresistive sensors ; couches épaisses ; thick-film technology ; résistances ; resistors ; TFR ; composites époxy-graphite ; epoxy-graphite composites ; carbone ; carbon
Caractérisation piézorésistive de résistances époxy-graphite. Version étendue publiée ensuite dans Sensors & Actuators (URL)
Record created on 2012-06-03, modified on 2016-08-09