US Government As Represented by the Secretary of the Army

The United States of America As Represented by the Secretary of

Bernard Smith

Louis E Branovich

Gerard L Freeman

Donald W Eckart

Stanley DuBuske

Albert F Newman

Eckart Donald W

A long life high current density cathode is made from a mixture of aluminum xide and tungsten oxide powders by processing the powders into a fused powder, adding barium hydride to the fused powder, inverting the fused powder and heating to decompose the barium hydride and obtain barium metal.

Method of making a long life high current density cathode from aluminum

A cathode is made from a mixture of tungsten and iridium powders using a ction product formed from reacting a Group III A metal powder with barium peroxide powder as an impregnant.

Method of making a cathode from tungsten and iridium powders using a

A cathode is made from a mixture of tungsten and iridium powders using a ontium peroxide containing material as the impregnant.

A long life high current density cathode is made from a mixture of tungsten nd iridium powders by processing the mixture of powders with an activator into a porous billet, and then impregnating the billet with a quaternary compound including barium, oxygen, a metal selected from the group consisting of osmium, iridium, rhodium, and rhenium, and a metal selected from the group consisting of strontium, calcium, scandium and titanium, by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts.

Method of making a long life high current density cathode from tungsten

A cathode is made from tungsten powder using as an impregnant the product rmed from adding about 1 mole of a member selected from the group consisting of zirconium, zirconium dioxide, hafnium, hafnium dioxide, uranium, uranium dioxide, titanium, and titanium dioxide to about 50 to about 100 moles of a compound selected from the group consisting of Ba.sub.3 Al.sub.2 O.sub.6, Ba.sub.3 WO.sub.6, and Ba.sub.4 Al.sub.2 O.sub.7.

Method of making a cathode from tungsten powder

A long life high current density cathode is made from a mixture of tungsten nd iridium powders by processing the mixture of powders with an activator into a porus billet, and then impregnating the billet with a mixture of barium peroxide and a coated emitter by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts.

A cathode is made from a mixture of tungsten and iridium powders using a ction product formed from reacting barium peroxide with an excess of tungsten as the impregnant.

A tungsten-iridium billet is impregnated with a chemical mixture of barium xide, strontium oxide, and aluminum oxide, the impregnated billet heated, and the surface of the impregnated billet desired for emission exposed to an overcoating of rhodium.

Method of overcoating a high current density cathode with rhodium

A cathode is made from a mixture of tungsten and aluminum powders.

Method of making a cathode from tungsten and aluminum powders

A long life high current density cathode is made from a mixture of tungsten nd iridium powders by processing the mixture of powders with an activator into a porous billet, and then impregnating the billet with a low melting point impregnant by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts.

A cathode is made from a mixture of tungsten and iridium powders using a ium iridiate formed from barium peroxide and iridium oxide as the impregnant.

A cathode is made from a mixture of tungsten and iridium powders using a ium peroxide containing material as the impregnant.

A long life high current density cathode is made from a mixture of tungsten nd iridium powders using a bariumaluminoiridiate as the impregnant.

A long life high current density cathode is made from a mixture of tungsten nd iridium powders using a barium iridiate as the impregnant by processing the mixture of powders with an activator into a porous billet, and then impregnating the billet with a barium iridiate by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts.

The face of a cathode surface is machined to provide a spiral surface fin with microscopic sharp symmetrical protrusions. The cathode gives enhanced emission due to field emission generated at the sharp symmetrical protrusions and due to the increased surface area.

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Ocean, NJ, United States of America

Bernard Smith