The measurements of vacuum arc behaviour at threshold current

Abstract The measurements of vacuum arc current parameters at the threshold current were made. The threshold currents for Cu, W, graphite cathodes were measured. It was shown that the current that vacuum arc chops with, has a statistical distribution. The vacuum arc current chopping is accompanied with significant ion current burst. The ion current of W and Cu cathodes contains intensive peaks with 30-50 ns duration. It was shown that the cathode materials that have intense peaks have a significant threshold current.

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Increasing the ion charge states in vacuum arc plasmas by arc current spikes

Proceedings ISDEIV. 19th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.00CH37041) ◽

10.1109/deiv.2000.877301 ◽

2002 ◽

Cited By ~ 1

Author(s):

G.Yu. Yushkov ◽

E.M. Oks ◽

A. Anders ◽

I.G. Brown

Keyword(s):

Vacuum Arc ◽

Arc Current ◽

Arc Plasmas ◽

Charge States

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STABILITY OF A VISCOUS INCOMPRESSIBLE CONDUCTING LIQUID LAYER OF A CYLINDRICAL SHAPE IN AN INHOMOGENEOUS TEMPERATURE FIELD AND A MAGNETIC FIELD OF A VACUUM ARC CURRENT THROUGH IT

10.46813/2021-133-091 ◽

2021 ◽

pp. 91-97

Author(s):

O.L. Andrieieva ◽

B.V. Borts ◽

А.F. Vanzha ◽

I.М. Korotkova ◽

V.I. Tkachenko

Keyword(s):

Magnetic Field ◽

Temperature Field ◽

External Magnetic Field ◽

Fluid Layer ◽

Vacuum Arc ◽

Cylindrical Shape ◽

Conducting Liquid ◽

Inhomogeneous Temperature ◽

Inhomogeneous Temperature Field ◽

Arc Current

Convective mass transfer in a cylindrical viscous incompressible conductive fluid layer in an inhomogeneous temperature field and in the external magnetic field of the vacuum arc current through it is theoretically investigated in this work. For a horizontal layer of a viscous, incompressible, conducting liquid of a cylindrical shape, located in a temperature field inhomogeneous in height and in an external magnetic field of a vacuum arc current flowing through it, the original equations are written. These equations consist of linearized equations for small velocity perturbations, small deviations from the equilibrium values of temperature, pressure, and magnetic field strength. The considered boundary value problem is solved for the case of free boundaries. Comparison of the experimental data with theoretical calculations made it possible to determine the rotation velocity of the steel melt during vacuum arc melting.

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Influence of Plasma Assistance on Arc Deposited MoN Coatings

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.712.9 ◽

2016 ◽

Vol 712 ◽

pp. 9-14 ◽

Cited By ~ 1

Author(s):

Olga Krysina ◽

Vladimir V. Shugurov ◽

Nikolay Koval ◽

Nikita Prokopenko

Keyword(s):

High Hardness ◽

Ion Current ◽

Vacuum Arc ◽

High Wear Resistance ◽

Molybdenum Nitride ◽

Coating Properties ◽

Current Ratio ◽

Gas Plasma ◽

Vacuum Arc Deposition ◽

Arc Deposition

The paper reports on a study to optimize the modes of plasma-assisted vacuum arc deposition of molybdenum nitride (MoN) coatings. It is shown that the parameters of plasma assistance influence the coating properties and that varying the ion current ratio in the metal-gas plasma makes possible MoN coatings with high hardness and high wear resistance.

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