Secondary-emissive electrode including a cermet

Details Secondary-emissive electrode including a cermet Secondary-emissive electrode including a cermet

H - Electricity

01

J

313/75

H01J 1/32 (2006.01) H01J 9/12 (2006.01) H01J 43/06 (2006.01) H01J 43/24 (2006.01)

Patent

CA 1038013

ABSTRACT: A substrate bearing a secondary-emissive layer which consists of a cermet consisting of a readily evaporable metal, for example Au, Ag, Cu, Ni, Cr, Al or a nickel-chromium alloy, and an alkali metal aluminium fluoride, for example cryolite. The substrate material may be, for example mild steel, or a synthetic plastics material. It is possible to make large dynodes when using mild steel substrates which are much cheaper than silver-magnesium or beryllium-coppor. The secondary- emissive layer does not require an activation treatment inside an electric discharge tube into which it is incorporated.

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