X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1988-08-15
1989-09-12
Church, Craig E.
X-ray or gamma ray systems or devices
Source
Electron tube
378143, 378144, H01J 3500
Patent
active
048667480
ABSTRACT:
An x-ray rotor structure wherein a target support stem has an externally threaded end portion brazed to an internally threaded surface of an encircling bushing which is provided with a barrier layer of oxidation restricting material. The stem is made of predominantly molybdenum material and the bushing is made of iron cobalt nickel alloy material having therein a small percentage by weight of titanium. The barrier layer comprises a layer of substantially pure nickel material which coats the entire inner surface of the bushing including the internally threaded portion thereof. Thus, the titanium is restricted from leaching to the surface during brazing and forming oxides which prevent the surface from being completely wetted by the brazing material. As a result, during brazing, the liquified brazing material alloys with the nickel material of the barrier layer to wet the inner surface of the bushing completely. Consequently, upon cooling, the alloyed brazing material and the nickel material of the barrier layer constitute an interlocking layer forming a durable brazed joint for fixedly attaching the bushing to the stem.
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Caraher James R.
Fengler Albert F.
Xu Ming-Wei P.
Church Craig E.
Cole Stanley Z.
Freeman John C.
Schnapf David
Varian Associates Inc.
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