Abstract:
Method of manufacturing laminated rotary anodes for use in x-ray tubes in which in a first step a laminated disc-shaped member is jointed by a single blow to another disc-shaped member, the diameters of the members being increased and their thicknesses decreased. The rotary anode is made from the resulting assembly. The laminated disc-shaped assembly consists at the target area, for example of a tungsten-rhenium alloy and at the other surface of tungsten or an alloy between capable of being shaped than the first mentioned tungsten-rhenium alloy.
Abstract:
The present invention relates to a graphite target for X-ray tubes. In order to avoid the drawbacks of graphite carrier (1) targets due to transformation into carbide of the photo-emissive coating (3) by the carrier material, the invention provides for the formation of the intermediate layer (2) in these targets, in the shape of two sub-layers one of which (20), in contact with the carrier, is made of a refractory material which does not form a carbide (iridium for example), and the other of which (21) is made of another refractory material (tantalum for example), which prevents diffusion of carbon from the carrier into the emissive layer.
Abstract:
Disclosed is an improved composite anode for rotating-anode xray tubes and an improved method of fabrication thereof. The anode comprises a substrate disk, a portion of whose focal track is scored, for example by scratching or engraving of one or more annular grooves of rectangular cross-section. A coating of x-ray emissive material covers the scored region. In certain embodiments of the invention, the emissive coating is undercoated with an interlayer of a material which is a poor emitter of xrays. The emissive coating and/or the undercoating may cover other portions of the disk and, in particular, may cover all exposed surfaces thereof. The method comprises providing such a disk, scoring it in the focal track region and applying an x-ray emissive coating to the scored region. The last step may be preceded by the application of an undercoating of a material which is a poor x-ray emitter. Either or both coatings may be applied to other surfaces of the disk.
Abstract:
A process is described for imparting resistance to rotary anodes for X-ray tubes by spraying a graphite base with tungsten or a tungsten alloy, followed by depositing an outer coating of tungsten or an alloy thereof from the gaseous phase.
Abstract:
A method of manufacturing an X-ray tube component, includes diffusion bonding or brazing an anode of rhodium, molybdenum or tungsten to a heat spreader of molybdenum, tungsten, or a composite of molybdenum and/or tungsten. Suitable joint materials for diffusion bonding include gold; suitable joint materials for brazing include an alloy of silver and copper, an alloy of silver, copper and palladium, an alloy of gold and copper or an alloy of gold, copper and nickel. The resulting tube component delivers reliable behaviors and the joint can withstand high temperatures, high temperature gradients, fast temperature changes, extremely high radiation and extremely high electric field, while maintaining good high vacuum properties.
Abstract:
A method of manufacturing an X-ray tube component, includes diffusion bonding or brazing an anode of rhodium, molybdenum or tungsten to a heat spreader of molybdenum, tungsten, or a composite of molybdenum and/or tungsten. Suitable joint materials for diffusion bonding include gold; suitable joint materials for brazing include an alloy of silver and copper, an alloy of silver, copper and palladium, an alloy of gold and copper or an alloy of gold, copper and nickel. The resulting tube component delivers reliable behaviours and the joint can withstand high temperatures, high temperature gradients, fast temperature changes, extremely high radiation and extremely high electric field, while maintaining good high vacuum properties.
Abstract:
An anode (30) is formed by building a carbon, such as a carbon reinforced carbon composite, or other ceramic substrate (50). A ductile, refractory metal is electroplated on the ceramic substrate to form a refractory metal carbide layer (52) and a ductile refractory metal layer (54), at least on a focal track portion (36). A high-Z refractory metal is vacuum plasma sprayed on the ductile refractory metal layer to form a vacuum plasma sprayed high-Z refractory metal layer (56), at least on the focal track portion.
Abstract:
An X-ray emitting target including a diamond substrate, a first layer disposed on the diamond substrate and including a first metal, and a second layer disposed on the first layer and including a second metal whose atomic number is 42 or more and which has a thermal conductivity higher than that of the first metal. The layer thickness of the first layer is greater than or equal to 0.1 nm and smaller than or equal to 100 nm. The target is prevented from overheating, so that output variation due to rising temperature is suppressed. Thus it is possible to emit stable and high output X-rays.
Abstract:
An anode (30) is formed by building a carbon, such as a carbon reinforced carbon composite, or other ceramic substrate (50). A ductile, refractory metal is electroplated on the ceramic substrate to form a refractory metal carbide layer (52) and a ductile refractory metal layer (54), at least on a focal track portion (36). A high-Z refractory metal is vacuum plasma sprayed on the ductile refractory metal layer to forma vacuum plasma sprayed high-Z refractory metal layer (56), at least on the focal track portion.