FIELD: lighting engineering; gas-discharge lamps.
SUBSTANCE: as distinct from prior-art hollow cylindrical cathode, proposed one has its inner and outer surfaces facing lamp discharge area coated with layer of gas-absorbing material deposited thereon by way of cathodic spraying. Hollow cylindrical part can be made of metal chosen from group of nickel, molybdenum, tantalum, or niobium. Gas-absorbing layer can be produced from metal chosen from group of titanium, vanadium, yttrium, zirconium, niobium, hafnium, and tantalum, or from zirconium or tantalum based alloy with one or more elements chosen out of transition metals and aluminum. Thickness of mentioned layer can be minimum 20 μm. Inner and outer surfaces can be partially coated by masking in the course of deposition by way of cathodic spraying using base element of adequate form.
EFFECT: enlarged service life of cathode.
6 cl, 5 dwg
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| VACUUM TUBE | 1994 |
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| GAS-DISCHARGE TUBE ELECTRODE ASSEMBLY | 0 |
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