Carbon fiber's exceptional properties-high strength, modulus, corrosion resistance, thermal stability, and fatigue performance-make it indispensable across military, medical, industrial, and sporting applications. Its electrical resistance depends on chemical composition, graphitization level, and structural defects. At lower temperatures, resistance is primarily governed by impurities, while high-temperature behavior reveals intrinsic electronic conduction characteristics.
To measure electrical resistance, carbon fiber samples are integrated into a circuit containing a DC power supply, ammeter, voltmeter, variable resistor, and switch. Testing involves systematically varying environmental temperature, precursor sizing content, drying conditions, and fiber length while recording resistance values.
Findings indicate that fiber length and desizing/drying processes exhibit no direct correlation with resistance. Environmental temperature, however, demonstrates a clear inverse relationship: resistance decreases as temperature rises, and conversely increases when temperatures drop. Resistivity also correlates strongly with crystallinity-higher crystallinity reflecting advanced graphitization consistently lowers resistivity.
Compared to metals, carbon fiber maintains remarkably stable resistivity. Metallic conductors experience significant resistance fluctuations due to environmental factors and volumetric changes, whereas carbon fiber's electrical properties remain relatively consistent under varying conditions.
