SOLID SOLUTION MATRIX CATHODE
Assignee
VARIAN ASSOCIATES, INC., A CORP. OF DE
Filed
Mar 18, 1988
Granted
Nov 30, 1993
Location
SAN FRANCISCO CA US
Abstract
An impregnated thermionic cathode includes a porous matrix of sintered tungsten-alloy particles containing less than six percent iridium and/or other platinum-group metal. The pores of the matrix are impregnated with a temporary process impregnant such as molten copper or an organic monomer, and upon solidification is machined to a desired shape. Thereafter the temporary process impregnant is removed, and the matrix pores again infiltrated with a barium oxide such as molten barium aluminate, or other alkaline earth. A thin, iridium-rich surface activating layer, preferably of about 50% iridium, is then applied to the emitting surface. The diffusion of surface activating iridium is substantially blocked; superior emission and lifetime is provided; and the cathode is relatively low cost and easy to fabricate.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 10, 1989
Rescinded
May 26, 1993
Duration
4 years, 2 months
Inventor
- 1GERARD A. GOESER
Record Details
- Patent number
- US 5266414
- Application
- 07170194
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records