X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1988-08-15
1990-11-06
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Source
Electron tube
378131, 378132, 378144, H01J 3510
Patent
active
049691724
ABSTRACT:
An x-ray tube rotor structure wherein a target support stem has an externally threaded end portion engaged with an internally threaded surface of an encircling bushing and fixedly attached thereto by an interposed brazed joint. The stem is made of predominantly molybdenum material having a linear thermal expansion coefficient of 58.times.10.sup.-7 per degree Fahrenheit and is thermally matched with the bushing which is made of an iron cobalt nickel alloy material having a linear thermal expansion coefficient of 60.times.10.sup.-7 per degree Fahrenheit. The bushing has an outer surface fixedly attached through a welded joint with an inner surface of an annular plug which has an outer marginal portion fixedly attached to an adjacent end portion of a coaxial rotor skirt. The annular plug is made of an iron chrome nickel alloy material having a linear thermal expansion coefficient of 84.times.10.sup.-7 per degree Fahrenheit and is thermally compatible with the rotor skirt which is made of magnetic flux conductive steel having a linear thermal expansion coefficient of 75.times.10.sup.-7 per degree Fahrenheit. Thus, the largest thermal disparity and the maximum thermal stresses occur between the bushing and the plug at the interposed welded joint which is structurally stronger than the brazed joint between the bushing and the stem.
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Daly Raymond A.
Fengler Albert F.
Koller Thomas J.
Tavoletti Steven
Xu Ming-Wei P.
Fields Carolyn E.
Machlett Labs. Inc.
Porta David P.
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