Study on service performance of SiBCN ceramic temperature sensor under heat flux shock

Systematic research on the sensing performance of polymer-derived SiBCN ceramic sensors under intense transient thermal shocks remains limited. This study investigates their thermoresistive behavior under rapid heat flux shocks, examining both unpackaged and packaged sensors. Results indicate: the sensor has an initial resistance of ∼1.39 × 10⁹ Ω at room temperature, with the sensor's resistance decreasing by six orders of magnitude, reaching 6034 Ω at 1260 °C, with resistance decreasing monotonically as temperature rises, showing typical negative temperature coefficient (NTC) characteristics; unpackaged sensors maintain stable NTC response under different heat flux densities and remain highly stable after 22 cycles; packaged sensors work stably for 25 s at 2.0 MW/m² and retain NTC response during cycling at 1 MW/m²; unpackaged sensors achieve effective temperature measurement for 105 s at 1.0 MW/m². These results confirm their highly suitable for industrial applications that require high-temperature stability and precise measurement capabilities.