Incandescent lamp filament incorporating hafnium

Details Incandescent lamp filament incorporating hafnium Incandescent lamp filament incorporating hafnium

1990-01-16

1992-09-15

O'Shea, Sandra L.

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

H01J 114

Patent

active

051480808

ABSTRACT:
The lamp filament has a substoichiometric nitrided surface layer containing hafnium or hafnium alloy which exhibits higher emissivity in the visible light spectrum. The filament is made by providing a metallic wire containing hafnium, shaping the wire into a filament and then reacting the filament in an atmosphere containing hydrogen.

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