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Materials-Metals 2017
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November 16-17, 2017 Paris, France
13
th
Annual Conference on
Materials Science, Metal and Manufacturing
Journal of Materials Science and Nanotechnology
Volume 1 Issue 2
E N Moos et al., Mater Sci Nanotechnol 2017, 1:2
Surface change in ion-plasma flows
E N Moos, S V Gavrilov, M N Makhmudov, A I Kudyukin
and
V A Stepanov
Ryazan State University, Russia
T
he interaction of electrodes with ion-plasma flows
changes the state of their surface, including blistering
in devices of plasma electronics. In addition, the state of
cathodes based on aluminum oxides (Al-Mg), the change
in the electrodes of magnetically controlled contacts (Fe-
Ni), the electrodes of vacuum arc interrupters (Cu-Cr) is
changing. Processes and mechanisms of interaction of plasma
flows with a surface are still relevant. The report studies the
evolution of the surface of electrodes in ion-plasma flows
and simulates changes in the morphology of electrodes in an
arc discharge under controlled gas and vacuum conditions.
In the work, the processes were studied by a complex of
methods of X-ray photoelectron spectroscopy, electron
microprobe analysis, layer-by-layer and raster mode, and
atomic force microscopy. A layer analysis, for example, of an
aluminum cathode oxide of He-Ne laser containing dopants
of magnesium and iron, reveals segregation of carbon to the
surface and simultaneously a change in the concentration
of free aluminum, magnesium, and oxygen. Blistering,
known for spacecraft and nuclear installations with ion
beam energies of tens and hundreds of keV, was detected in
electrodes of gas-filled devices containing neon atoms of the
order of 2, 11 wt.%. In the vacuum arc discharge of the surface
of Cu-Cr electrodes, the concentration of Cu atoms (the main
substance of the alloy) and the oxygen on the surface are
higher than the bulk values. The copper content is reduced
in volume to 78.2%. In the cathode region, the auto electrons
initiating the arc discharge, generated in the emission centers
by high current densities that stimulate the heating of this
zone and are accompanied by the spraying of the substance of
the electrodes. In the melting zone, the oxygen concentration
decreased more than twofold from 4.9 wt.% up to 2.2 wt.%.
Biography
Evgeny Moos is a Professor since (1997-2017) at Department of General
Physics, Ryazan State University, Ryazan, Russia. Lectures on natural history
and general physics: mechanics, molecular physics and thermodynamics,
electricity, optics and Physics laboratory: mechanics, molecular physics and
thermodynamics, electricity, optics, atomic physics and quantum electronics.
e_moos@mail.ru