Refractory-oxide-based incandescible radiators and method of mak

Details Refractory-oxide-based incandescible radiators and method of mak Refractory-oxide-based incandescible radiators and method of mak

1975-01-31

1977-04-05

Demeo, Palmer C.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

29 2517, 75207, 75 5R, 313222, 313345, 106 65, 106 66, H01K 110

Patent

active

040164462

ABSTRACT:
Refractory-oxide-based elongated incandescent radiator has a body portion which principally comprises refractory oxide with from about 8 volume percent to 20 volume percent of refractory metal dispersed therein. Such members are normally not sufficiently conducting to enable them to be self-resistance heated to a condition of incandescence. The room-temperature conductivity of such a member is greatly increased by heating the initially sintered member during fabrication thereof to a temperature of at least about 1400.degree. C while simultaneously subjecting the heated member to the influence of an electric field having an intensity of at least about 5 volts/mm. The completely processed members can be self-resistance heated to a condition of incandescence without the use of supplemental heaters. In its preferred form the radiator carries thereon a thin oxide coating, in order to improve the visible-radiation-emission characteristics. These radiators have utility as incandescent elements in light sources.

REFERENCES:
patent: 2845515 (1958-07-01), Anderson et al.
patent: 3278281 (1966-10-01), Ehringer
patent: 3475159 (1969-10-01), Hansen
patent: 3853491 (1974-12-01), Dunham

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