Solid solution matrix cathode

Details Solid solution matrix cathode Solid solution matrix cathode

1988-03-18

1993-11-30

Walsh, Donald P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Component of composite having metal continuous phase...

428552, 428553, 428569, 75232, 75234, 75248, 75245, 313346R, 136202, B22F 310, B22F 704

Patent

active

052664147

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.

REFERENCES:
patent: 4097762 (1978-06-01), Hilton et al.
patent: 4165473 (1979-08-01), Fabce
patent: 4393328 (1983-07-01), Shroff et al.
patent: 4494035 (1985-01-01), Palluel et al.
patent: 4570099 (1986-02-01), Green
patent: 4675570 (1987-06-01), Green

Affiliated with

Also associated with

Rating

Solid solution matrix cathode does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid solution matrix cathode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid solution matrix cathode will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2094521