To investigate the feasibility of various materials as electrodes of a MHD generator, the electrical, physical and chemical characteristics of the metallic and ceramic electrodes made of Inconel, LaCrO
3-ZrO
2, AlSl-304 and other refractory alloys were investigated under simulated conditions using a 1.2 MW test rig and DC power source.
The Inconel was selected as representative of metallic materials. Its electrical performances were improved remarkably above the temperature at which surface oxide was produced.
As the electrode temperature increased the amount of weight loss by oxidation and chemical erosion increased, however the electrical erosion increased at the lower temperatures.
The optimum temperature for performance was found to be from 800 to 1, 000°C. In this temperature region, the weight loss of the anode was less than that of the cathode, but this tendency was reversed below the temperature of 800°C.
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