Fabrication and Testing of MHD Electrodes Containing an Integral Leadout/Attachment System

摘要

A promising technique for the fabrication of HfO sub 2 -base ceramic electrode systems for coal-fired MHD generators is described. The electrodes are designed to withstand a surface temperature of approximately 1800 exp 0 C (partially slagging walls) and seed/slag attack. They are formed by hot pressing and contain a novel integral wire-mesh electrical leadout/attachment system that is cofabricated with the ceramic electrode body. This approach provides a mechanically strong interface for brazing the electrode directly to the cooling frames or to a mechanical attachment scheme without additional process steps. The electrodes have been successfully tested for 20 h under simulated MHD generator conditions. The fabrication concept is being extended to LaCrO sub 3 -base materials. (ERA citation 03:050532)