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  • 1
    Electronic Resource
    Electronic Resource
    The effect of low concentrations of a polyatomic gas in argon on erosion on copper cathodes in a magnetically rotated arc (1987)
    Springer
    Plasma chemistry and plasma processing 7 (1987), S. 349-364 
    Details
    ISSN: 1572-8986
    Keywords: Electrode erosion ; plasma torches ; magnetic rotation ; effect of gas composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Experimental results are presented for electrode erosion on copper cathodes in magnetically rotated arcs in argon, dry air, nitrogen, ammonia, and carbon monoxide as well mixtures of the above with argon. Water-saturated argon was also used. Erosion rates were determined by weight loss after chemical cleaning, and the runs were sufficiently long (between 5 to 60 min) to represent steady-state operation. Arc currents of 100 A and gas pressures of 1.1 atm. were used. Pure argon gave the highest erosion rates and the lowest arc velocities. Small concentrations of any of the diatomic gases in argon greatly increased the arc velocity and decreased the erosion rates. The results suggest that erosion is primarily a thermal phenomenon but that the surface chemistry can greatly influence erosion rates by modifying arc behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01016522
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  • 2
    Electronic Resource
    Electronic Resource
    Cathode erosion in inert gases: The importance of electrode contamination (1989)
    Springer
    Plasma chemistry and plasma processing 9 (1989), S. 121-132 
    Details
    ISSN: 1572-8986
    Keywords: Electrode erosion ; plasma torches ; magnetic rotation ; contamination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Experimental results are presented for electrode erosion on copper electrodes in magnetically rotated arcs in argon and helium. Measurements were also made of the arc voltage and velocity. The effects due to the contamination of the electrode surface by either a native contaminant layer (copper oxide and carbon traces) or the continuous injection of very small amounts of various diatomic gases (nitrogen, oxygen, chlorine, and carbon monoxide) into the inert plasma gases were determined. The erosion rates for pure argon were significantly higher than those for pure helium (13.5 μg/C for argon and 1 μg/C for helium) and with both gases, very high arc velocities were measured initially (〉60 m/s for argon and 〉160 m/s for helium) when a natural contaminant layer was still present on the cathode. The removal of this layer resulted in lower velocities (2m/s for argon and 20m/s for helium) and higher erosion rates. The removal of the layer was much faster with argon, due possibly to higher electrode surface current densities for argon arcs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015830
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    Paper (German National Licenses)
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