Abstract: The present invention provides a rotary anode for an X-ray tube which comprises an anode body formed of graphite, a preformed sheet formed of rhenium and bonded to the top surface of the anode body, and a target layer formed of tungsten or an alloy thereof and bonded to the top surface of the preformed sheet. This rotary anode may further comprise a preformed plate formed of molybdenum and interposed between and bonded to the preformed sheet and the target layer. Also disclosed is a method for manufacturing the rotary anode.

Abstract: A metal nut for clamping a metal or nonmetal x-ray target to a metal anode stem or a rotating anode x-ray tube. The nut body is basically circular and has an axial threaded hole. The body has an axially extending cylindrical portion that is contiguous with a generally convex portion on one side of the cylindrical portion and is concave on the other side. The concavity is surrounded by an annular land for transmitting compressive force to the target. A cross-section of the nut simulates a beam that is thickest axially adjacent the central threaded hole and decreases in thickness symmetrically radially away from the center so it will flex when tightened at room temperature and have residual force stored when hot to compensate the metals for thermal creep.

Abstract: In an exemplary embodiment, a metallic shield for the discharge space between the cathode and the anode is connected to a potential which is greater than half the tube voltage and smaller than the entire tube voltage. What is achieved thereby is that backscatter electrons from the focal spot space are withdrawn and the anode load carrying capacity is thereby increased, and that the outside-of-focus component of the radiation is reduced as well. Moreover, a very close-to-focus definition or collimation of the cone of rays is possible. X-ray tubes according to the disclosure are particularly applicable in medical X-ray diagnostics.

Abstract: A layer of pyrolytic graphite is deposited on the surface of the basic body of the anode of a rotary-anode X-ray tube. On the layer of pyrolytic graphite there is provided a further layer of a high-melting metal on the surface of which the focal path extends during operation of the tube. A basic body which has substantially all advantages of the pyrolytic graphite but whose manufacture is much simpler, faster and hence also more economical than an equivalent carrier body comprising a ring of solid, thick-walled pyrolytic graphite, is obtained in that the basic body consists of a lamination of graphite foils at least in the region beneath the focal path.

Abstract: The invention relates to anodes for X-ray tubes and a method of producing same. Several layers are deposited one after another onto a substrate by means of chemical vapour deposition. The proposed combination of layers results in a proper bond to the substrate. The combination comprises a first layer of molybdenum or a molybdenum alloy; a second layer of a tungsten-molybdenum alloy and a third layer of tungsten or a tungsten alloy. The composition of the second layer varies over its thickness.

Abstract: The exemplary embodiments produce successive x-ray beams with different wavelengths and may comprise a rotating anode whose anode body has x-ray generating parts of different materials. Heretofore, the x-rays arising at the parts have been conducted through filters outside the tube which, synchronously moved, are allocated to the parts of the rotating anode. Since, however, the allocation of the filters to the parts of the anode is difficult in such a subsequent synchronization, according to the disclosure a fixed allocation ensues in that the filters are incorporated into the tube and are integrated in the rotation of the anode. To that end, they are designed as walls lying at right angles in the discharge path of the x-rays and are rigidly connected to the shaft of the anode arrangement. Such x-ray tubes are particularly suitable as a radiation source for employment in medical x-ray diagnostics.

Abstract: A rotary anode comprising a basic body of carbon whose surface is provided with a pyrolytic graphite coating having a crystallographic layer structure. A metallic layer of high-melting temperature, in which X-rays are generated during operation in an X-ray tube, is provided on the body. The metallic layer and the pyrolytic graphite coating have a common contact face which cuts through the crystallographic layers in the pyrolytic graphite. Heat developed in the metallic layer is discharged through the face into the pyrolytic graphite layers.

Abstract: In a rotary anode X-ray tube, comprising an anode disc which is mounted on a rotary shaft and which comprises a basic body of graphite, the anode disc is subject to such loads during the operation of the X-ray tube that a connection between the disc and the shaft is liable to fracture if it consists of pressed and sintered graphite. In order to counteract fracturing, the basic body is connected to the shaft by a bushing of pyrolytic or microporous graphite. A pyrolytic graphite bushing may be formed by deposition from the gaseous phase in situ or on a mandril, and should have a radial direction of growth. Both materials have a high strength and, moreover, a lower thermal conductivity in the radial direction. As a result, not only is the strength improved, but the thermal loading of the shaft bearings is also reduced.

Abstract: A rotating-anode X-ray tube for producing a flat wide-angle fan-shaped beam with a substantially uniform distribution of energy comprises a cylindrical anode and a cathode axially or peripherally offset from the target area or focus bombarded by the electrons so that the axis of the fan-shaped beam emitted by that area can extend radially to the cylindrical anode surface. An arcuate shield closely paralleling this cylindrical surface is apertured at its center in front of the focus and intercepts stray electrons which would be liable to bombard the anode at points outside the target area so as to give rise to extra-focal radiation. Such a tube is useful in apparatus designed for axial transverse tomography.

Abstract: An intermediate layer comprising several sub-layers is sandwiched between the support and a target layer of a rotary X-ray anode. The sub-layer of the intermediate layer which contacts the support and the sub-layer of the intermediate layer which contacts the target layer both consist of pure rhenium. Interposed between these two sub-layers is a further sub-layer consisting of a rhenium alloy containing at least one carbide-forming metal, for example tungsten, tantalum or hafnium. This construction of the intermediate layer provides a barrier against carbon diffusion, which barrier has substantially the heat conduction properties of metals and which offers a sufficient protection against the penetration of carbon into the target layer, even at temperaturers above 1500 K.

Abstract: A graphite disc assembly for a rotating x-ray tube embodying a graphite substrate and an anode target of either tungsten or tungsten rhenium joined thereto by a layer of rhodium, osmium, ruthenium, platinum, platinum-chromium, or palladium. .Iadd.

Abstract: A composite substrate for use in a rotating x-ray anode tube consists of a graphite member joined to another member to which a target anode is affixed.