Ceramic component for electrodes

摘要

A ceramic component suitable for preparing MHD generator electrodes consists of HfO2 and sufficient Tb4O7 to stabilize at least 60 volume percent of the HfO2 into the cubic structure. The ceramic component may also contain a small amount of PrO2, Yb2O3 or a mixture of both to improve stability and electronic conductivity of the electrode. The component is highly resistant to corrosion by molten potassium seed and molten coal slag in the MHD fluid and exhibits both ionic and electronic conductivity.