Rapid\nPrinting of High-Temperature Polymer-Derived\nCeramic Composite Thin-Film Thermistor with Laser Pyrolysis

Abstract

Polymer-derived\nceramic (PDC)-based high-temperature thin-film\nsensors (HTTFSs) exhibit promising applications in the condition monitoring\nof critical components in aerospace. However, fabricating PDC-based\nHTTFS integrated with high-efficiency, high-temperature anti-oxidation,\nand customized patterns remains challenging. In this work, we introduce\na rapid and flexible selecting laser pyrolysis combined with a direct\nink writing process to print double-layer high-temperature antioxidant\nPDC composite thin-film thermistors under ambient conditions. The\nsensitive layer (SL) was directly written on an insulating substrate\nwith excellent conductivity by laser-induced graphitization. Then,\nthe antioxidant layer (AOL) was written on the surface of the SL to\nrealize the integrated manufacturing of double-functional layers.\nThrough characterization analysis, it was shown that B₂O₃ and SiO₂ glass phases generated by the PDC\ncomposite AOL could effectively prevent oxygen intrusion. Therefore,\nthe fabricated PDC composite thermistors exhibited a negative temperature\ncoefficient in the temperature range from 100 to 1100 °C and\nhigh repeatability below 800 °C. Meanwhile, it has excellent\nhigh-temperature stability at 800 °C with a resistance change\nof only 2.4% in 2 h. Furthermore, the high-temperature electrical\nbehavior of the thermistor was analyzed. The temperature dependence\nof the conductivity for this thermistor has shown an agreement with\nthe Mott’s variable range hopping mechanism. Additionally,\nthe thermistor was fabricated on the surface of an aero-engine blade\nto verify its feasibility below 800 °C, showing the great potential\nof this work for state sensing on the surface of high-temperature\ncomponents, especially for customized requirements.