Abstract: This study investigates the role of carbon nanotube-modified phenolic resin as an organic carbon source in enhancing the electrical resistance properties of carbon ceramics. The microstructure of the carbon ceramic resistors was characterized using scanning electron microscopy (SEM), while the distribution of carbon elements within the ceramic was analyzed using energy-dispersive spectroscopy (EDS). The thermal stability was evaluated using a temperature coefficient of resistance (TCR) meter, and the voltage coefficient of resistance (VCR) and energy withstand capability were tested using a pulse voltage generator. The results indicate that the introduction of carbon nanotube-modified phenolic resin optimized the microstructure and properties of the composite material, improving both mechanical strength and thermal stability. The Young's modulus increased from 214 to 281 GPa, and the temperature coefficient of resistance decreased from $-2 252$$\times$10$^{-6}$ to $-873$$\times $10$^{-6}$/℃. The improved voltage coefficient of resistance decreased from $-1.06$ to $-0.32%$/(kV$\cdot$cm$^{-1}$), and the energy withstand capability increased from 200 to 450 J$\cdot$cm$^{-3}$.

Key words: carbon-ceramic resistor, phenolic resin, carbon nanotubes, energy endurance, temperature coefficient of resistance (TCR)