CATHODE

摘要

The oxide cathode is manufactured by forming an electron emission material layer on the Ni-base metal by the spray method, and coating a tungsten-iridium (W-Ir) alloy (wt.% ratio of 90-60:10-40) on the layer to form a metal-coated layer of 1000-20000 angstroms by maintaining it under the vacuum or hydrogen atmosphere at 1100-1250 deg.C for 5-360 min. The oxide cathode has a high current density and a long life.