Fabrication and Performance of MHD Electrodes
A brief presentation of the requirements for electrode module materials will perhaps afford some insight as to the reasons for selecting the development program for materials preparation and fabrication techniques described herein. A simple module may consist of three parts: a water cooled, metallic base which serves as the current collector and connector; an electronic conductor electrode which transfers electricity to the plasma; an electrical insulator to separate modules. The selection of electrode material is most critical and difficult. This material must have good electronic conductivity and should be a good electron emitter. It must be chemically resistant to and/or compatible with potassium seed, coal slag, and the insulator material at temperatures above about 1900°K; as well as being compatible with the base material at temperatures up to perhaps 1300°K. In addition to having a melting point above 2300°K, the material should exhibit good thermal shock resistance. Although the ideal electrode material has yet to be proven as part of a useful electrode module, progress has been made toward this goal.
KeywordsElectrode Module Plasma Spray Powder Feeder Spray Distance Metallic Base
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