INVESTIGATION OF GROWTH-CONDITIONS OF FIBROUS DEPOSITS IN CARBON-ARC

Carbon fibrous deposits grown in carbon de electric are at various buf fer gas pressures and are currents were investigated by transmission a nd scanning electron microscopy. The fibers contained in the deposits consisted of bundles of carbon tubes, It was found that yield and morp hology were very sensitive to both parameters; sintering of the tubes could be prevented by adjusting buffer gas pressure for a given curren t, It is argued that these parameters control expansion of carbon gas and condensation rate, and therefore energy flow to the cathode. To pu rify samples by oxidation and to observe differences in resistance aga inst oxidation of samples obtained at various conditions, the thermogr avimetry method was used.