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US 5,294,399 AGranted
Preparation of cathode structures for impregnated cathodes
AssigneeNEC Corporation
InventorYasuhiro Akiyama
Life of this patent
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Abstract
Disclosed is a process for preparing a cathode structure for impregnated cathodes having desired dimensions by a simplified process without experiencing machining etc. A high-melting-point metal powder is introduced into a mold, and heated with the heater to effect isostatic press molding to provide a cathode structure for impregnated cathodes having a predetermined shape and dimensions by one operation.
Claims12
A process for preparing a cathode structure for impregnated cathodes, comprising the steps of:
- introducing a high-melting-point metal powder into a mold;
- performing an isostatic hot press molding process on the mold containing the high melting point metal powder thus forming a cathode structure covered with a thin film of high melting point metal;
- removing a portion of the thin film from an electron emitting surface of the cathode structure;
- and
- impregnating the electron surface of the cathode structure with a barium based compound.
2 more elements
A process for preparing a cathode structure for impregnated cathodes comprising the steps of:
- selecting a mold;
- placing a heater sleeve in the mold;
- introducing a high-melting-point metal powder into the mold;
- performing an isostatic hot press molding process on the mold thus forming a cathode structure covered with a thin film of high-melting-point metal;
- removing a portion of the thin film from an first surface of the cathode structure;
- and
- impregnating the first surface of the cathode structure with a barium based compound.
4 more elements
Dependencies are inferred from the claim text.