Determination of electron density and energy influx in a hollow cathode glow discharge used for powder modification |
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Authors: | M Quitzau H Kersten |
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Institution: | 1.Institute of Experimental and Applied Physics,Christian-Albrechts University,Kiel,Germany |
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Abstract: | The electron density and energy influx in an argon hollow cathode glow discharge were determined to obtain adequate parameters
for subsequent surface modification of low density polyethylene (LDPE) powder to change the wettability. The electron density
was studied by Langmuir probe measurement in dependence on process gas pressure and hollow cathode material. Besides the determination
of the rate of increasing electron density with input power an optimal experimental pressure was determined. The energy influx
was studied by thermal probe measurements in dependence on process gas pressure, bias voltage, axial position and hollow cathode
material. Inside the hollow cathode the energy influx is nearly constant along the whole cathode length. With increasing pressure
the energy influx decreased. At biased thermal probe the energy influx was observed to decrease up to the floating potential
and beyond it increases with increasing voltage. Using different hollow cathode materials the electron density as well as
the energy influx reach higher values for aluminum than for copper and stainless steel. |
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