Recently, various forms of electrical discharges for both polarities have been tested as a potential means for carbon structures synthesis: the glow discharge, pre-breakdown streamers, breakdown streamers, and low-current arc discharge. A novel method of carbon fibre synthesis by low-current electrical-discharge plasma in hydrocarbon vapours was proposed and presented in the paper. The discharge was generated between a stainless steel needle, and a plate made of a nickel-based alloy, for the voltage ranging from 2 kV up to 30 kV. The discharge was stabilized by a high series resistance (10 MΩ). The experiments were carried out in argon atmosphere, and normal temperature and pressure. The arc discharge of the current in the range of 1 ÷ 4 milliamps was found to be a potential effective route for carbon fibers production.
A novel method to synthesize carbon fibres using low-current electrical-discharge plasma
in hydrocarbon vapours is presented in the paper. The low-current arc discharge of positive polarity
was generated between a stainless steel needle, and a nickel alloy plate, over a voltage range from 2
kV to 30 kV. The discharge was stabilised by a high series resistance (1 – 12.5 M'). The
experiments were carried out in an argon atmosphere at normal temperature and atmospheric
pressure. The arc discharge of current in the range of 1 to 4 milliamps was found to be a potentially
effective method for the production of carbon fibres. The diameter of the fibres varied from about
20 to 120 μm with a growth rate of about 0.5 mm/s.
Direct-current corona discharge and back-discharge generated in needle-plate electrode configuration in air, Ar, N 2 , or CO 2 , flowing smoothly through a discharge chamber were investigated. The back discharge is dielectric barrier discharge generated in the presence of normal corona discharge, when the plate electrode is covered with a dielectric layer of high resistivity. In the experiments with back discharge a mica plate was used as the dielectric barrier. A small pinhole was made in the plate center to initiate an electrical breakdown through the dielectric layer. Comparative studies of corona and back-corona discharges at normal temperature and pressure were carried out in the aspects of discharge morphology and the current-voltage characteristics.PACS : 52.80.Hc
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