An electric-arc plasma installation operated in the hidden anode arrangement isconstructed and used for the preparation of carbon nanostructures.A contracted plasma are gen-erated by a plasma torch using an inert gas is used as heat source.The average mass temperatureof arc is higher than 10^(-4)K,while its power density,which is directly transferred onto the electrode(anode),is～2 kW/mm^2.The anode contact area formed on the electrode moves against the arcby way of shifting the electrode and is hidden completely in the interior of plasma gas streammoving towards it.As a result of both the direct plasma attack and the opposite movement ofstreams in the hidden anode contact area,a temperature higher than 6000 K is reached.Thus,intensive vaporization takes place,which forms a saturated plasma-gas-aerosol phase of the initialmaterial of electrode(anode).This gas phase is mixed in and carried by the plasma stream.Overthat mixed plasma stream,a controlled process of quenching(fixation)is carried out by twistedturbulent fluid streams.After the fixation,the resultant carbon nano-structures are caught by afilter and collected in a bunker.
展开▼
