Graphene/SiCN Thin-film Strain Gauges Fabricated by Direct Writing

The in-situ strain/stress detection of hot components in harsh environments remains a challenging task. In this study, graphene/SiCN thin-film strain gauges were fabricated on alumina substrates by direct ink writing. The percolation model and piezoresistive effect of graphene/SiCN composites were systematically studied. On this basis, a thin film strain gauge with high conductivity (0.1s /cm) and high sensitivity (gauge factor 9.9) of ceramic matrix conductive composites was fabricated. The graphene /SiCN thin film strain gauge has excellent static and dynamic strain response at room temperature. Subsequently, the strain dynamic test was conducted at 400°C, and there was no attenuation of the gauge factor, so as to verify the high-temperature performance of the graphene/SiCN thin-film strain gauge. Therefore, graphene/SiCN thin-film strain gauges provide an effective approach for the measurement of the in-situ static and dynamic strain of hot components in high-temperature environments.