Effects of temperature and hydrocarbon concentration on the thickening of CVD carbon fiber were examined. Various concentrations of hydrocarbon, ranging from 17 to 83, balanced by hydrogen, were used. The hydrocarbon concentration ranged from 17 to 83. The growth temperatures were 800 deg C, 900 deg C, 1000 deg C, 1100 deg C, 1200 deg C, 1300 deg C. It was found that the thickening rate peaks at temperatures near 1100 and 1200 deg C when 40 methane and 33 propane were used as the hydrocarbon sources, respectivley. At these peak thickenging rates, CVD fibers exhibit rough pitted surface, which are not commonly seen.
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