Graphite cathode cup for gridded x-ray tubes

Details Graphite cathode cup for gridded x-ray tubes Graphite cathode cup for gridded x-ray tubes

1985-09-03

1987-06-16

Moore, David K.

Electric lamp and discharge devices

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

Supporting and/or spacing elements

313310, 313311, 313352, 378193, 445 29, H01J 148, H01J 3504, H01J 914

Patent

active

046738428

ABSTRACT:
A cathode cup structure for a high voltage x-ray tube having a base formed of a weldable material and an exposed upper surface of a non-weldable material bonded to the base. The upper surface may be machined from a block of graphite to form an appropriate cathode cup structure configuration and then bonded to a base formed of TZM using a platinum brazing compound. The graphite upper surface may be coated with pyroltic carbon to reduce dust or alternatively, may be formed of a composition of silicon carbide graphite to minimize dusting problems. The graphite composition of the upper section of the cathode cup minimizes the risk of welding of an electron emissive filament passing through the cup structure.

REFERENCES:
patent: 2683236 (1954-07-01), Rawls et al.
patent: 3329849 (1967-07-01), Jones
patent: 4220889 (1980-09-01), Marhic et al.

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