The effect of surface electrolytic treatment on carbon fibers and the microstructure of pyrocarbon around it during chemical vapor deposition

Before chemical vapor deposition, carbon fibers were electrolyzed for different time, using 33 wt% nitric acid and 5 wt% ammonium bicarbonate solution as electrolyte solution respectively. Effects of the electrolytic treatments on the morphology and chemical functional groups of carbon fibers were deeply analyzed. The influence of these surface treatments on the deposition of pyrocarbon during chemical vapor deposition was also investigated. Results show that the electrolytic treatments for proper time improve the surface morphology and adjust the surface functional groups of carbon fibers. The main functional groups on fiber surface are HBS and –COOH groups, which then induce the efficient deposition of pyrocarbon and improve the microstructure of pyrocarbon during chemical vapor deposition.

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