| Ultrafine carbon powders were prepared under the following conditions in Cl₂C = CH₂+ H₂system; reaction temperature of 650 - 1,450℃, total was pressure of one atmosphere, 6.2-38.6 vol.% of Cl₂C = CH₂ and total gas flow-rate of 140-690㎖/min. Yield, particle sire and specific surface area of the pyrolytic carbon powders were investigated as functions of the reaction variables. The yield increases and decreases with increase of the reaction temperature and the gas flow-rate, respectively. The particle sire increases with increase of temperature and shows a maximum value of 0.5㎜ at 950℃, and then decreases at higher temperatures. The particle size keeps an almost constant value (i.e., 0.2㎛) within the range of 6.2 to 38.6 vol.% of Cl₂C = CH₂, while decreases with increase of the total gas flow-rate. The specific surface area and the diameter of carbon powders prepared at 1,450℃ are 30㎡/gr and below 0.1㎛, respectively. |
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