X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1992-05-05
1993-11-23
Porta, David P.
X-ray or gamma ray systems or devices
Source
Electron tube
378127, 378143, H01J 3508
Patent
active
052648010
ABSTRACT:
A target track (20) of an anode (14) of an x-ray tube becomes heated adjacent a focal spot (18) to temperatures on the order of 1100.degree.-1400.degree. C. To protect the anode, a body portion (34) is coated (46) with a thermal energy emissive oxide layer (48). In order to prevent carbon from the body portion from migrating out to the oxide layer and forming carbon monoxide gas, a carbide forming barrier layer (36) is formed (38,40) between the body and the oxide coating. The barrier layer is a dense, substantially pore-free coating of a metal that has a free energy of carbide formation of at least 100 KJ/mole at 1200.degree. C. Preferably, the barrier layer material is zirconium, although hafnium, titanium, vanadium, uranium, tantalum, niobium, chromium, and their alloys also provide acceptable barriers to carbon atom migration. A molybdenum layer (44) is disposed (42) between the oxide layer and the barrier layer to prevent the zirconium or other of the above-listed barrier materials from interacting detrimentally with constituents of the oxide layer.
REFERENCES:
patent: 4090103 (1978-05-01), Machenschalk et al.
patent: 5157706 (1992-10-01), Hohenauer
patent: 5159619 (1992-10-01), Benz et al.
DeCou, Jr. Donald Frank
Hull James G.
Picker International Inc.
Porta David P.
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