Electrical conductivity controlling of SiHfBCN-Mo polymer derived ceramic coating

SiHfBCN ceramics derived from the polymer-derived ceramic (PDC) route possess excellent mechanical properties and high-temperature stability, yet their poor electrical conductivity limits their practical applicability. To address this issue, molybdenum (Mo) powder was introduced as a conductive filler and uniformly mixed with the SiHfBCN precursor. By tailoring the Mo content and pyrolysis temperature, interconnected Mo particles formed conductive pathways within the coating. Together with the in-situ formed graphitic carbon phase, these pathways established a hybrid conductive network, leading to a significant enhancement in electrical conductivity. After pyrolysis at 1200 °C, the SiHfBCN-0.5Mo coating exhibited a minimum resistivity of 0.381 mΩ cm. This work systematically investigates the influence of Mo content and pyrolysis temperature on the resulting electrical and mechanical properties of the coatings, providing fundamental insights into the design of polymer-derived ceramic-based conductive films.