EP0430766A2 - Anode für eine Röntgenröhre - Google Patents

Anode für eine Röntgenröhre Download PDF

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Publication number
EP0430766A2
EP0430766A2 EP90403294A EP90403294A EP0430766A2 EP 0430766 A2 EP0430766 A2 EP 0430766A2 EP 90403294 A EP90403294 A EP 90403294A EP 90403294 A EP90403294 A EP 90403294A EP 0430766 A2 EP0430766 A2 EP 0430766A2
Authority
EP
European Patent Office
Prior art keywords
layer
anode
layers
anode according
interposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90403294A
Other languages
English (en)
French (fr)
Other versions
EP0430766A3 (en
Inventor
Jean-Marie Cabinet Ballot-Schmit Penato
Emile Cabinet Ballot-Schmit Gabbay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric CGR SA
Original Assignee
General Electric CGR SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric CGR SA filed Critical General Electric CGR SA
Publication of EP0430766A2 publication Critical patent/EP0430766A2/de
Publication of EP0430766A3 publication Critical patent/EP0430766A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/108—Substrates for and bonding of emissive target, e.g. composite structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/08—Targets (anodes) and X-ray converters
    • H01J2235/088—Laminated targets, e.g. plurality of emitting layers of unique or differing materials

Definitions

  • the invention relates to an X-ray tube anode, more particularly a rotating anode of the type comprising a base body carrying a target formed by a surface layer of an X-ray emitting material.
  • X-rays are obtained under the effect of electronic bombardment of a layer of a target material, that is to say generally a material to high atomic number, refractory and good conductor of heat such as, for example, tungsten, molybdenum, or an alloy containing at least one of these elements.
  • a target material that is to say generally a material to high atomic number, refractory and good conductor of heat such as, for example, tungsten, molybdenum, or an alloy containing at least one of these elements.
  • the target layer is bombarded over a small area called the focal point, which constitutes the source of the radiation.
  • the rotating anodes are generally formed by a base body or substrate forming a block of regular shape such as a disc, a cone or the like, and on which is deposited one or more layers of an X-ray emissive material or target material.
  • the adhesion of the target material layer on the base body is improved by the deposition of an intermediate bonding layer, thus creating a certain continuity between the emissive material and the material forming the substrate, for example by surface diffusion of the fastening material in the other two materials or vice versa. This continuity can promote the propagation of cracks generated in the emissive material.
  • the object of the invention is in particular to remedy these drawbacks by proposing an anode comprising a particular structure preventing the propagation of cracks generated in the emissive material towards the base body or substrate, or vice versa.
  • an anode for an X-ray tube for example, a rotating anode, comprising a base body or substrate on which a target is formed by a layer of target material, characterized in that it comprises at least one layer interposed between said target layer and the substrate, made of a material having a "plasticity" higher than that of the material forming the substrate and the target material.
  • This layer of plastic material absorbs and attenuates the stresses generated by the formation of a crack in the target material or the substrate. Thus, the risks of cracking of this material being much more weak, due to its ability to deform, the propagation of these will be stopped or markedly attenuated. This layer of plastic material can also reduce the risk of these cracks forming by absorbing deformations of the layer of emissive material.
  • plasticity of a material it is necessary to understand the faculty of the material to be deformed permanently.
  • a material having a high ductility has a high plasticity.
  • the invention provides a second embodiment of the invention consisting in interposing between the target layer and the substrate a multi-layer structure consisting of several superimposed layers parallel to the target layer and formed alternately by a material to high plasticity and a material with low plasticity.
  • a bonding layer is interposed between, on the one hand, the target layer and the layer of plastic material or the multi-layer structure and, on the other hand, between the substrate or body base and plastic layer or multi-layer structure.
  • the bonding layers constitute the external layers of the multi-layer structure.
  • the material or materials forming the plastic layer or the multi-layer structure must, of course, have a melting temperature higher than the operating temperature of the anode, and in particular that of the hearth.
  • these materials must have the property suitable for the invention, such as plasticity, at all operating temperatures of the tube.
  • these operating temperatures are between that of the environment and 1400 ° C.
  • the materials suitable for the invention are in particular metallic elements or metallic alloys.
  • the material constituting the plastic layer or the layers of the multi-layer structure is an alloy of elements constituting the target layer, such as for example, an alloy of tungsten or molybdenum, the plasticity of this alloy being controlled by its composition.
  • the basic body may be constituted by a carbon block, metallic or made of composite material such as a carbon-carbon composite machined to a desired shape, or by several elements formed from identical or different materials and assembled, for example, by brazing.
  • the layers constituting the plastic layer, the multi-layer structure, the target layer and possibly the bonding layers are successively deposited on the surface of the base body by the usual techniques such as chemical vapor deposition and deposition processes.
  • chemical vapor deposition and deposition processes physics in vapor phase, better known respectively by the English acronyms CVD and P.V.D., electrolysis, plasma torch, for example.
  • the invention also relates to an X-ray tube comprising a rotating anode as described above.
  • an X-ray tube comprises, in an empty enclosure, not shown, a cathode 1 situated opposite an anode 2.
  • the cathode 1 is inserted in a focusing optics assembly 3 allowing the electron beam 4 emitted by the cathode to be guided and focused on a small surface 5 of the anode 2 called the focal point.
  • the emission of the electron beam 4 by the cathode is generated by high temperature heating of a filament (not shown).
  • the anode 2 receives the electron beam 3 and re-emits X-radiation referenced 6, in particular in the direction of a use window 17 provided, for example, on the envelope of the tube.
  • the anode 2 is mounted on an axis, not illustrated, driven in rotation.
  • the focus 5 is a crown of small width defined on the surface of the anode 2.
  • the anode 2 comprises a base body or substrate 7, having a cone shape in the example illustrated, on the outer surface of which is arranged a set of layers whose structure is illustrated in FIGS. 3 and 4.
  • the outermost layer 8 is the target layer constituted by an X-ray emitting material. Interposed between the substrate 7 and this target layer 8, a layer 9, made of a material plastic is deposited. In the illustrated embodiment, a bonding layer 10, 11 is deposited between on the one hand the substrate and the layer 9 and on the other hand the layer 9 and the target layer 8.
  • the target layer 8 and the bonding layers 10 and 11 are identical to the first embodiment.
  • a multi-layer structure 12 is interposed between the target layer 8 and the substrate 7.
  • This structure consists of a stack of layers 13, 14 made of materials having different plasticity characteristics.
  • the layers 13 have a high plasticity while the layers 14 are not deformable.
  • This succession of interfaces between plastic layer and non-plastic layer further reduces the ease of propagation of a crack.
  • An example of the composition of such a structure will be given below.

Landscapes

  • X-Ray Techniques (AREA)
EP19900403294 1989-11-28 1990-11-21 Anode for an x-ray tube Withdrawn EP0430766A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8915633A FR2655191A1 (fr) 1989-11-28 1989-11-28 Anode pour tube a rayons x.
FR8915633 1989-11-28

Publications (2)

Publication Number Publication Date
EP0430766A2 true EP0430766A2 (de) 1991-06-05
EP0430766A3 EP0430766A3 (en) 1992-05-27

Family

ID=9387861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900403294 Withdrawn EP0430766A3 (en) 1989-11-28 1990-11-21 Anode for an x-ray tube

Country Status (3)

Country Link
US (1) US5138645A (de)
EP (1) EP0430766A3 (de)
FR (1) FR2655191A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578109A1 (de) * 1992-07-03 1994-01-12 Tokyo Tungsten Co., Ltd. Drehanoden-Röntgenröhre und Herstellungsverfahren dafür

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5875228A (en) * 1997-06-24 1999-02-23 General Electric Company Lightweight rotating anode for X-ray tube
US5943389A (en) * 1998-03-06 1999-08-24 Varian Medical Systems, Inc. X-ray tube rotating anode
US7180981B2 (en) 2002-04-08 2007-02-20 Nanodynamics-88, Inc. High quantum energy efficiency X-ray tube and targets
US7194066B2 (en) * 2004-04-08 2007-03-20 General Electric Company Apparatus and method for light weight high performance target
DE102005049519B4 (de) * 2005-01-31 2014-10-30 Medicoat Ag Drehanodenteller für Röntgenröhren
US20080118031A1 (en) * 2006-11-17 2008-05-22 H.C. Starck Inc. Metallic alloy for X-ray target
US7720200B2 (en) * 2007-10-02 2010-05-18 General Electric Company Apparatus for x-ray generation and method of making same
US8699667B2 (en) 2007-10-02 2014-04-15 General Electric Company Apparatus for x-ray generation and method of making same
US8553843B2 (en) 2008-12-17 2013-10-08 Koninklijke Philips N.V. Attachment of a high-Z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target
US10692685B2 (en) * 2016-06-30 2020-06-23 General Electric Company Multi-layer X-ray source target

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2082406A5 (de) * 1970-03-13 1971-12-10 Radiologie Cie Gle
FR2379158A1 (fr) * 1977-01-28 1978-08-25 Radiologie Cie Gle Tube radiogene pour fournir un faisceau de rayons x plat en eventail de grande ouverture et appareil de radiologie comportant un tel tube
FR2415876A1 (fr) * 1978-01-27 1979-08-24 Radiologie Cie Gle Tube a rayons x, notamment pour tomodensitometre
DE2929136A1 (de) * 1979-07-19 1981-02-05 Philips Patentverwaltung Drehanode fuer roentgenroehren
US4298816A (en) * 1980-01-02 1981-11-03 General Electric Company Molybdenum substrate for high power density tungsten focal track X-ray targets
FR2498375A1 (fr) * 1981-01-16 1982-07-23 Thomson Csf Limiteur universel de rayonnement secondaire dans un tube radiogene et tube radiogene comportant un tel limiteur
NL8101697A (nl) * 1981-04-07 1982-11-01 Philips Nv Werkwijze voor het vervaardigen van een anode en zo verkregen anode.
FR2531571A1 (fr) * 1982-08-06 1984-02-10 Thomson Csf Tube a rayons x universel pour la stereographie
US4415529A (en) * 1982-09-29 1983-11-15 Unitika Ltd. Mn-Based alloy of nonequilibrium austenite phase
FR2534066B1 (fr) * 1982-10-05 1989-09-08 Thomson Csf Tube a rayons x produisant un faisceau a haut rendement, notamment en forme de pinceau
FR2535344A1 (fr) * 1982-10-29 1984-05-04 Thomson Csf Procede de depot selectif d'une couche de metal refractaire sur une piece en graphite
FR2548829B1 (fr) * 1983-07-06 1985-11-22 Thomson Csf Tube a rayons x a anode tournante muni d'un dispositif d'ecoulement des charges
FR2566960B1 (fr) * 1984-06-29 1986-11-14 Thomson Cgr Tube a rayons x a anode tournante et procede de fixation d'une anode tournante sur un axe support
JPS6166349A (ja) * 1984-09-07 1986-04-05 Hitachi Ltd Ｘ線管用回転陽極タ−ゲツトおよびその製造方法
FR2581823B1 (fr) * 1985-05-07 1987-06-12 Thomson Cgr Dispositif radiologique a tube radiogene a paliers magnetiques
FR2588180A1 (fr) * 1985-10-08 1987-04-10 Thomson Cgr Appareil d'examen radiologique
FR2593324B1 (fr) * 1986-01-17 1988-03-25 Thomson Cgr Anode tournante avec graphite pour tube radiogene
FR2605799B1 (fr) * 1986-10-28 1989-01-13 Thomson Cgr Dispositif de refroidissement d'une source radiogene
FR2622757B1 (fr) * 1987-10-30 1989-12-08 Thomson Cgr Dispositif emetteur de rayons x de type compact
FR2625035B1 (fr) * 1987-12-22 1993-02-12 Thomson Cgr Anode tournante en materiau composite pour tube a rayons x
FR2626108B1 (fr) * 1988-01-18 1990-05-04 Thomson Cgr Tube a rayons x a anode tournante comportant un dispositif d'ecoulement du courant anodique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578109A1 (de) * 1992-07-03 1994-01-12 Tokyo Tungsten Co., Ltd. Drehanoden-Röntgenröhre und Herstellungsverfahren dafür
US5508118A (en) * 1992-07-03 1996-04-16 Tokyo Tungsten Co., Ltd. Rotary anode for x-ray tube

Also Published As

Publication number Publication date
US5138645A (en) 1992-08-11
EP0430766A3 (en) 1992-05-27
FR2655191A1 (fr) 1991-05-31

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