Impregnated cathodes with a controlled porosity
AssigneeU.S. Philips Corporation
InventorJan F. C. M. Wijnen
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Abstract
A storage cathode comprising a porous, sintered body of a refractory metal is produced by compacting and sintering powder particles of a refractory metal, at least a portion of which are coated, before compacting, with a thin layer of a ductile metal. As a result thereof, it is possible to compact the refractory metal powder, before sintering, at temperatures lower than 600.degree. C., in a non-conditioned space and in an air atmosphere.
Claims6
A method of producing a storage cathode comprising a porous, sintered body of a refractory metal, the method comprising compacting individual non-interlocking powder particles of a refractory metal into a body and sintering the body, characterized in that at least a portion of the powder particles are individually coated, before compacting, with a thin layer of a ductile metal, the layer having an average thickness within the range of about 0.005 .mu.m and less than 1/10 of the radius of the powder particles, and in that compacting of the individual, coated particles is effected at a temperature lower than 600.degree. C.
Dependencies are inferred from the claim text.