Patent · US Expired

Method of making a borided dispenser cathode

US4530669A · kind A · utility

3Cited by

5References

5Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Georg Gartner · Aachen, DE
Egbert B. G. W. Gotje · Eindhoven, NL

Key dates

Filing date	Feb 22, 1983
Grant date	Jul 23, 1985
Priority date	—
Expiry date	Feb 22, 2003

Classification

Technology area (CPC H)Electricity
CPC primaryH01J9/042
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A borided dispenser cathode of the type including a metallic base material is made by cleaning the cathode by annealing it in a hydrogen-containing atmosphere, depositing boron on the cathode by heating the cathode in an atmosphere containing a gaseous boron compound, and forming a boride of the metallic base material by heating the cathode to its operating temperature in a non-reactive atmosphere and maintaining the temperature for a time period sufficient to enable deposited boron to combine with the metallic base material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.