Electron emission materials and components

Details Electron emission materials and components Electron emission materials and components

1999-02-26

2000-04-18

Gupta, Yogendra

Compositions

Electrically conductive or emissive compositions

Free metal containing

25251912, 25252021, 313326, 313352, H01B 102, H01B 106, H01J 100, H01J 102

Patent

active

060511656

ABSTRACT:
Electron emission materials consisting of carbides, borides, and oxides, and related mixtures and compounds, of Group IVB metals Hf, Zr, and Ti, Group IIA metals Be, Mg, Ca, Sr, and Ba, and Group IIIB metals Sc, Y, and lanthanides La through Lu are used in electrodes. The electron emission materials include ternary Group IVB-IIIB and IVB-IIA oxides. These electron emission materials are typically contained in a refractory metal matrix formed of tungsten, tantalum, rhenium, and their alloys, but may also be used by themselves. These materials and electrodes have high melting points, low vapor pressures, low work functions, high electrical and thermal conductivity, and high thermionic electron emission and field emission properties.

REFERENCES:
patent: 5118984 (1992-06-01), Saito et al.
patent: 5284614 (1994-02-01), Chen et al.
patent: 5548184 (1996-08-01), Choi et al.
patent: 5592043 (1997-01-01), Gartner et al.
patent: 5911919 (1999-06-01), Billings
patent: 5934900 (1999-08-01), Billings

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