Improved Method of Making a High Current Density Cathode.
Abstract
A high current density cathode is made by first forming an active porous high purity tungsten pellet by the steps of: (a) mixing tungsten powder with about 1 to 5 percent by weight of the mixture of an activator powder and compacting the powders at a pressure of about 35 tons per square inch to form a pellet, (B) sintering the pellet in a non-oxidizing atmosphere at about 1800 degrees C for about 1 1/2 to 3 1/2 hours to the desired porosity, (C) filling the porous pellet with a filler material, (d) machining to the desired size and shape, (E) removing the filler material, and then forming the cathode by impregnating the pellet with Ba5Sr(WO6)2 at about 1700 degrees C in an inert atmosphere and subsequently firing for 2 minutes at 1800 degrees C in dry hydrogen. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 19, 1982
- Accession Number
- ADD009310
Entities
People
- Bernard Smith
- Gerard L. Freeman
Organizations
- United States Army