Single crystal whisker electric light filament

Details Single crystal whisker electric light filament Single crystal whisker electric light filament

1988-03-29

1989-09-05

Wieder, Kenneth

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313578, 313633, H01K 110

Patent

active

048641863

ABSTRACT:
An electric light filament comprising a single crystal whisker is disclosed. In the preferred embodiment the whisker consists essentially of silicon carbide (SiC), preferably beta silicon carbide, doped with a sufficient amount of nitrogen to render the whisker sufficiently electrically conductive to be useful as a light bulb filament at household voltages. Filaments made of such materials are characterized by high strength, durability, and resilience, and have higher electrical emissivities than conventioanl tungsten filaments.

REFERENCES:
patent: 821017 (1906-05-01), Clark
patent: 3875477 (1975-04-01), Fredriksson et al.
patent: 4513030 (1985-04-01), Milewski
patent: 4565600 (1986-01-01), Ricard
Encylopedia of Materials Science and Engineering, "Whiskers", Milewski, Bever, ed., pp. 5344-5346, 1/86, Pergamon Press.
Journal of Materials Science, "Growth of Beta-Silicon Carbide Whiskers by the VLS process", Milewski et al., pp. 1160-1166, 1/85, Chapman and Hall.

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