STUDIES ON BASE NICKELS FOR OXIDE-COATED CATHODES
Abstract
Techniques developed for uniform preparation of oxide coatings, and for processing and pumping the experimental structures, are summarized. Results of chemical activation of oxide cathodes using a variety of activating techniques are presented. These techniques include the use of normal single-additive alloy bases, carbon-nickel diffusion couples, a controllable carbon source, and the controlled exposure to Ba and Mg vapor. Results demonstrate that high, stable emission levels can be maintained for extended periods of cathode operation even in the presence of a declining rate of coating reduction if competing effects can be sufficiently minimized. An investigation of the response of oxide cathodes to step changes in temperature is described, showing both long-term and short-term changes in emission. Studies of the deactivation of oxide cathodes indicated that anode bombardment results in cathode deactivation as a consequence of the dissociation of impurity compounds evolved from the cathode, rather than by dissociation of alkaline-earth metal oxides on the anode. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1961
- Accession Number
- AD0267372
Entities
People
- D.e. Anderson
Organizations
- University of Minnesota