Tantalum carbide or tantalum-alloy carbide filament mounting and

Details Tantalum carbide or tantalum-alloy carbide filament mounting and Tantalum carbide or tantalum-alloy carbide filament mounting and

1966-03-21

1977-06-28

James, Andrew J.

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313218, 313272, 313276, 313311, 313316, 313315, 313331, H01J 116, H01J 1906, H01K 104, H01J 188

Patent

active

040328090

ABSTRACT:
Coiled incandescible filament which principally comprises tantalum carbide has coiled end portions thereof overfitting relatively thick tantalum carbide members, with the inner surfaces of the overfitting coils welded to the relatively thick members. Electrical connection and support for the filament is made to the relatively thick, overfitted members, rather than the fine, brittle filament. In order to effect the weld between the overfitting coils and the relatively thick members, the coils and relatively thick members are first overfitted as metals and then carbided, with diffusion welds therebetween formed during the carbiding process.

REFERENCES:
patent: 1637034 (1927-07-01), Bergmans
patent: 2434478 (1948-01-01), Allen
patent: 2987643 (1961-06-01), Ackerman
patent: 3022437 (1962-02-01), Cooper
patent: 3183395 (1965-05-01), Rively et al.
patent: 3237284 (1966-03-01), Bird
patent: 3287591 (1966-11-01), Sloan

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