Accession Number : ADD006284

Title :   Tube with Bonded Cathode and Electrode Structure and Getter.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Oliver,David W ; Lavoo,Norman T

Report Date : 09 May 1979

Pagination or Media Count : 49

Abstract : The variety of technologies that have been applied in the development of a bonded grid cathode are described. These include chemical vapor deposition of tungsten, molybdenum, iridium BN, and Si3N4 on both sides of a sintered tungsten cathode disk. Zirconium and titanium getters have been used to eliminate nitrogen evolution problems. The getter plates are also used as heat shields for the bonded heater. Films of Si3N4 have been added to the insulation to prevent calcium and barium diffusion into the layer and maintain adequate resistivity and breakdown strength. Plasma etching was introduced as a method of removing Si3N4 from the cathode pores.

Descriptors :   *Patent applications, *Microwave tubes, *Tube grids, *Cathodes(Electron tubes), *Getters, Vapor deposition, Insulation, Photolithography, Abrasive blasting, Erosion, Tungsten, Molybdenum, Iridium, Metal films, Zirconium, Titanium, Boron nitrides, Silicon nitrides, Heat shields, Layers, Power amplifiers

Subject Categories : Electrical and Electronic Equipment
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE