The Electrical Resistivity of B_4C Modified Phenol-formaldehyde Resin Matrix Composite Materials Pyrolyzed at Different Temperatures

摘要

The electrical resistivity is studied when B_4C modified phenol-formaldehyde (PF) resin is heat-treated at temperatures of 300-1500°C, and then the X-ray diffraction (XRD) spectra are also investigated. The results indicate that the electrical resistivity is elevated with the increase of pyrolytic temperature of PF resin. The addition of B_4C decreases the electrical resistivity efficiently when the temperature is range of 700-1000°C. Especially the composite is treated at tmperatures of 1000-1500°C. The analysis of XRD spectra suggests that the addition of B_4C promotes the arrangement of residue at high temperature. The arrangement reaction has not a direct effect on the electrical resistivity.