Cerium Tungsten Electrode Work Function

Positive ion cathode temperature is relatively low because of cerium tungsten electrodes, it is possible to make the cathode spot and the spots on the surface of the electrode region near the evaporated material in the form of referrals from easily condensed to a cathode potential minimum cathode spots. Thus, life and allow current increase in plasma cutting, water cooled anode and cathode role to play, while inhibiting the excessive evaporation and diffusion of active substance. But also it may be cerium tungsten electrode tip achieve a better balance of evaporation and condensation to form a "natural sharpening" feature. This "natural sharpening" feature enables sustained high arc stability, electrode and nozzle life expectancy. Thorium tungsten electrode work function higher than cerium tungsten electrode, the cathode pressure drop is relatively large, and the cathode spot withstand the current is large, when there is more than this cathode spots can withstand the maximum current flows cathode spot immediately He began to split. Because the cathode spot (in a molten state) is in the positive ion bombardment by the conditions of the formation, so to increase their number will make the cathode temperature rise, leading to the electrodes evaporated in serious condition, and even lead to the ends of the electrodes contraction phenomenon, and Arc will produce drift, resulting in decreased electrode life.

 

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