スパーク放電における金属電極温度の影響 (第1報) 特に大気中における純金属電極

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This work presents the influence of heating an electrode on the spark phenomenon. Pure Fe, Cu.Co, Ni, Cr, Al, Zn and Sn electrodes are heated to 700°C and changes of spectral lines intensity, the amount of erosion and spark column temperature are studied.The influence of electrode temperature on the amount of erosion depends upon the elements affinity for oxygen.The erosion rate of the electrode, made of an element which is not easily oxygenized, is accelerated according to its temperature.But the erosion rate of the electrode, made of an element which is easily oxygenized, is decelerated acconding to its temperature because of its oxide film.The erosion rate of Cu electrode, which is the most difficult to be oxygenized, depends upon its temperature in accordance with the formula M=C/θ-T approximately (C: constant number, θ: melting point, T: electrode temperature). On the other hand, we cant find a rule about the influence of electrode temperature on spark column temperature.But we find that irregularities arise from the change of the status of electrode surface or electrode matrix.
社団法人日本分光学会の論文