X-ray tube having a rotary anode with rhenium-containing bearing surfaces for a gallium-alloy lubricant
AssigneeU.S. Philips Corporation
InventorsCornelius D. Roelandse, Pieter Hokkeling
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Abstract
The invention relates to an X-ray tube having a rotary anode which is rotatably supported in a vacuum-tight housing by at least one metal-lubricated sliding bearing of which at least the cooperating bearing surfaces consist of a W-alloy and in which the lubricant is Ga or a Ga-alloy. In order to extend the life of the X-ray tube, in particular at operating temperatures of the bearing above 400.degree. C., a mechanically readily machinable W-alloy is used which comprises from 2 to 27% by weight of Re.
Claims4
In an X-ray tube having a vacuum-tight housing, a rotary anode, a bearing having a first bearing surface on said rotary anode and a second bearing surface in said housing cooperating with said first bearing surface for rotatably supporting said rotary anode in said housing, and a lubricant disposed between said bearing surfaces comprising Ga for effectively wetting said bearing surfaces and lubricating said bearing, wherein the improvement comprises:
- said first and second bearing surfaces consisting of an W-alloy having at least 99% by weight of W and Re, and in which the quantity of Re is between 2% and 27% by weight.
Dependencies are inferred from the claim text.