EP0430768A1 - Röntgenröhrenanode mit mehrteiligem Trägerkörper - Google Patents

Röntgenröhrenanode mit mehrteiligem Trägerkörper Download PDF

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Publication number
EP0430768A1
EP0430768A1 EP90403296A EP90403296A EP0430768A1 EP 0430768 A1 EP0430768 A1 EP 0430768A1 EP 90403296 A EP90403296 A EP 90403296A EP 90403296 A EP90403296 A EP 90403296A EP 0430768 A1 EP0430768 A1 EP 0430768A1
Authority
EP
European Patent Office
Prior art keywords
anode
base body
layer
ray tube
anode according
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.)
Ceased
Application number
EP90403296A
Other languages
English (en)
French (fr)
Inventor
Jean-Marie Cabinet Ballot-Schmit Penato
Michel Cabinet Ballot-Schmit Laurent
Philippe Cabinet Ballot-Schmit Thomas
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 EP0430768A1 publication Critical patent/EP0430768A1/de
Ceased 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

Definitions

  • the invention relates to an X-ray tube anode, more particularly a rotating anode of the type comprising a composite base body carrying a target formed by a surface layer of an X-ray emitting material.
  • X-radiation is obtained under the effect of electronic bombardment of a layer of a target material, that is to say, generally a material 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 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 on a small surface called focal point, constituting the source of X-radiation.
  • focal point constituting the source of X-radiation.
  • the large instantaneous powers (of the order of 100 kw) brought into play, and the small dimensions of the focal point have long led to the use of anodes rotating to distribute and evacuate the heat flow over a larger area than the hearth.
  • 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 base body of particular structure making it possible to limit the propagation of cracks in the base body and thus reduce the risks of bursting of the anode.
  • the invention provides an anode for an X-ray tube comprising a base body or substrate on which a target is formed by a layer of target material emitting X-rays.
  • the base body comprises at least two parts constituted by a first material linked together by a layer of a second material having a plasticity greater than that of the first 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 base body is formed of two parts made of a first fragile material and joined together by a layer of solder.
  • a plastic material such as metals or metal alloys is used.
  • the layer separating the parts made with the first material are parallel to the plane of longitudinal section of the base body.
  • the parts made of first fragile materials form layers parallel to the plane of longitudinal section of the base body, thus forming a multi-layer structure.
  • the first material must be refractory and have sufficient mechanical strength to form an X-ray tube anode and in particular a rotating anode.
  • suitable materials mention may be made of carbon, graphite, ceramics, carbon-carbon composites.
  • this material must have sufficient plasticity to absorb or absorb the stresses created during the generation of cracks at the interface with the first material.
  • Materials suitable for making the layer plastics include, in particular, platinum, zirconium, metal alloys such as the titanium-zirconium-beryllium alloy or the like.
  • the thickness of these plastic layers is not critical. However, in a preferred embodiment of the invention, this thickness is small compared to the thickness of the layers of non-plastic material, for example of the order of a hundredth of a millimeter to a few tenths of a millimeter.
  • the invention also relates to an X-ray tube comprising an 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 an optical assembly of focusing 3 for guiding and focusing the electron beam 4 emitted by the cathode on a small surface 5 of the anode 2 called focus.
  • 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 7 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 ring of small width defined on the surface of the anode 2.
  • the anode 2 has the shape of a block having inclined faces on which a target layer 8 is deposited.
  • the base body 9 or substrate comprises in its center a through bore 10 to allow the attachment of the anode 2 on an axis, not illustrated.
  • the base body 9 consists of two parts 11, 12 formed from a fragile material such as graphite, assembled together by a layer 13 of plastic material, advantageously a layer of material forming a solder such as a titanium-zirconium alloy- beryllium.
  • This solder can also be made with zirconium or platinum.
  • This layer of plastic material has a thickness of about 0.2 millimeters.
  • the anode 2 is constituted by washers 14 of fragile material such as graphite assembled together by layers 15 of plastic material such as the materials already mentioned above.
  • such a structure makes it possible to use as material for forming the basic body a light material such as graphite or a carbon-carbon compound while limiting the brittleness and the risks of it bursting by stopping the propagation of cracks at the interfaces between the layers of plastic material 13 or 15 and the brittle material 11, 12 or 14.
  • a light material such as graphite or a carbon-carbon compound

Landscapes

  • X-Ray Techniques (AREA)
EP90403296A 1989-11-28 1990-11-21 Röntgenröhrenanode mit mehrteiligem Trägerkörper Ceased EP0430768A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8915634 1989-11-28
FR8915634A FR2655192A1 (fr) 1989-11-28 1989-11-28 Anode pour tube a rayons x a corps de base composite.

Publications (1)

Publication Number Publication Date
EP0430768A1 true EP0430768A1 (de) 1991-06-05

Family

ID=9387862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403296A Ceased EP0430768A1 (de) 1989-11-28 1990-11-21 Röntgenröhrenanode mit mehrteiligem Trägerkörper

Country Status (3)

Country Link
US (1) US5155755A (de)
EP (1) EP0430768A1 (de)
FR (1) FR2655192A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0555083A1 (de) * 1992-02-07 1993-08-11 General Electric Company Gelötete Röntgenröhreanode Herstellungsverfahren

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5943389A (en) * 1998-03-06 1999-08-24 Varian Medical Systems, Inc. X-ray tube rotating anode
US8116432B2 (en) 2007-04-20 2012-02-14 General Electric Company X-ray tube target brazed emission layer
US8428222B2 (en) * 2007-04-20 2013-04-23 General Electric Company X-ray tube target and method of repairing a damaged x-ray tube target
BR112014015761A8 (pt) 2011-12-30 2017-07-04 Koninklijke Philips Nv método para criar uma articulação de solda entre uma chapa de ânodos e uma peça de grafite de um tubo de raios x, e conjunto de ânodos de um tubo de raios x

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031940A2 (de) * 1980-01-02 1981-07-15 General Electric Company Molybdän-Substrat für Treffplatten in Röntgenröhren hoher Leistungsdichte mit dem Auftreffbereich in Tungsten
EP0062380A1 (de) * 1981-04-07 1982-10-13 Koninklijke Philips Electronics N.V. Verfahren zur Herstellung einer Anode für Röntgenröhre und Anode

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
JPS59196542A (ja) * 1983-04-22 1984-11-07 Hitachi Ltd Ｘ線管用タ−ゲツト
JPS6095841A (ja) * 1983-10-31 1985-05-29 Hitachi Ltd Ｘ線管用タ−ゲツト
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
JPS6296643A (ja) * 1985-10-24 1987-05-06 Sumitomo Light Metal Ind Ltd 超塑性アルミニウム合金
FR2593324B1 (fr) * 1986-01-17 1988-03-25 Thomson Cgr Anode tournante avec graphite pour tube radiogene
JPS62271333A (ja) * 1986-05-19 1987-11-25 Hitachi Ltd Ｘ線管用タ−ゲツト
JPH0787082B2 (ja) * 1987-07-24 1995-09-20 株式会社日立製作所 Ｘ線管用回転陽極ターゲット
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
US5008918A (en) * 1989-11-13 1991-04-16 General Electric Company Bonding materials and process for anode target in an x-ray tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031940A2 (de) * 1980-01-02 1981-07-15 General Electric Company Molybdän-Substrat für Treffplatten in Röntgenröhren hoher Leistungsdichte mit dem Auftreffbereich in Tungsten
EP0062380A1 (de) * 1981-04-07 1982-10-13 Koninklijke Philips Electronics N.V. Verfahren zur Herstellung einer Anode für Röntgenröhre und Anode

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 233 (E-427)(2289) 13 août 1986, & JP-A-61 66349 (HITACHI LTD) 05 avril 1986, *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 307 (C-450)(2754) 07 octobre 1987, & JP-A-62 96643 (SUMITOMO LIGHT METALS IND LTD.) 06 mai 1987, *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0555083A1 (de) * 1992-02-07 1993-08-11 General Electric Company Gelötete Röntgenröhreanode Herstellungsverfahren

Also Published As

Publication number Publication date
FR2655192A1 (fr) 1991-05-31
US5155755A (en) 1992-10-13

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