Carbon Felt Properties of Pyrolytic Carbon Felt Direct Thermal CVD

Taking acetylene as the carbon source gas diluted with nitrogen gas in this paper, carbon felt was heated under the nitrogen atmosphere, the temperature of carbon felt increased using heat generated by itself, which so as to cleave the carbon source gas and densify carbon felt by pyrolytic carbon deposition. The electrothermal property of carbon felt at elevated temperature and pyrolytic carbon was fabricated by direct thermal chemical vapor deposition (CVD) were investigated. Deposition rate and microstructure morphology of pyrolytic carbon in the carbon felt under different processes were also researched by scanning electron microscopy (SEM). The results show that: the resistivity of carbon felt decreases with increasing temperature at 100°C~1000°C, temperature coefficient of resistance is-4.067×10-4. Deposition and Growth of Pyrolytic carbon are by small microcrystalline and layer mode, respectively, with the extension of the deposition time, tree-ring shape is formed. When other conditions are the same, the higher of gas carbon concentration, the faster of pyrolytic carbon deposition rate.