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US 10,553,388 B1Granted
High-brightness lanthanum hexaboride cathode and method for manufacturing of cathode
AssigneesNuFlare Technology, Inc., NuFlare Technology America, Inc.
InventorVictor Katsap
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Abstract
A thermionic cathode, an electron emission apparatus, and a method of fabricating the thermionic cathode are provided. The thermionic cathode includes an emitter. The emitter includes a lanthanum hexaboride (LaB6) crystal having a crystallographic orientation of (310). The operating temperature of the thermionic cathode is greater than 1800 K.
Claims3
A method for manufacturing a thermionic cathode, comprising:
- providing an emitter made of lanthanum hexaboride (LaB6) crystal having a crystallographic orientation of (310) and having a zero or negative workfunction temperature dependence coefficient;
- operably connecting the emitter to an emitter heater to provide heat to the emitter, wherein an operating temperature of the thermionic cathode is in a range from 1830 K to 1900 K;
- and
- interchanging the emitter with another emitter made of LaB6 having a crystallographic orientation of (100) when operating at temperature lower than 1800 K.
1 more element
Dependencies are inferred from the claim text.