EP0050893A1 - Anode tournante pour tube à rayons-X - Google Patents

Anode tournante pour tube à rayons-X Download PDF

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Publication number
EP0050893A1
EP0050893A1 EP81201150A EP81201150A EP0050893A1 EP 0050893 A1 EP0050893 A1 EP 0050893A1 EP 81201150 A EP81201150 A EP 81201150A EP 81201150 A EP81201150 A EP 81201150A EP 0050893 A1 EP0050893 A1 EP 0050893A1
Authority
EP
European Patent Office
Prior art keywords
graphite
base body
pyrolytic graphite
layer
ray tube
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.)
Granted
Application number
EP81201150A
Other languages
German (de)
English (en)
Other versions
EP0050893B1 (fr
Inventor
Bernhard Dr. Lersmacher
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0050893A1 publication Critical patent/EP0050893A1/fr
Application granted granted Critical
Publication of EP0050893B1 publication Critical patent/EP0050893B1/fr
Expired 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 with a base body which consists at least partially of carbon, a layer of pyrolytic graphite deposited on the surface of the base body and a further layer of a high-melting metal arranged on the layer of pyrolytic graphite, on the surface of which during operation the BrennflecKbahn runs through the tube.
  • a rotating anode with a base made of graphite, which is provided with a layer of pyrolytic graphite, is known from DE-OS 21 46 918.
  • the pyrolytic coating serves to create smooth, dense surfaces, so that no particles can detach from the base body. Due to the lack of pores, ie the hindrance of the so-called after-gassing, maintaining a permanent high vacuum is also much easier than with uncoated basic bodies made of graphite. According to this published specification, it should already be sufficient to improve the yield in the generation of the X-rays if only the focal spot web is coated. Then no loose particles can occur, so that the focal path holds well.
  • the pyrolytic coating gives a smooth surface on which even a thin coating with metal becomes smooth, so that X-rays can escape well and the dose loss occurring in the case of uncoated graphite anodes on the roughness is avoided.
  • the problem of heat dissipation from the BrennflecKbahn is not addressed in DE-OS 21 46 918.
  • an X-ray tube anode is known with a support body which can be connected to a shaft and which is connected to a ring of pyrolytic graphite arranged concentrically to its axis of rotation, the surfaces of the larger thermal conductivity parallel to the axis of rotation of the ring in the ring Carrier body run and the focal track is applied to one end of the ring.
  • the carrier body and the ring made of pyrolytic graphite together correspond to the aforementioned basic body, which, however, is not coated with pyrolytic graphite in the latter rotating anode.
  • the direction of the good thermal conductivity of the anisotropic pyrolytic graphite is used for sufficient heat dissipation from the particularly heavily used focal track.
  • the ring made of pyrolytic graphite must be as thick as possible, so that layers of pyrolytic graphite that are as thick as possible must be produced.
  • the minimum thickness is determined by geometric factors. If the heat loss is optimally coupled into the highly conductive layers of pyrolytic graphite, the layer thickness should be at least the width of the focal track, but should be wider if possible.
  • the production of solid pyrolytic graphite of this thickness requires a high expenditure in terms of apparatus and time, as is known, for example, from Philips Technische Rundschau 37 (1977/78) 205-213 using conventional CVD techniques.
  • the growth rates are in the order of 2 to 10 / um / min, so a coating time of several hours is required for 1 mm layer thickness.
  • the invention has for its object to provide a basic body as part of a rotating anode, which has practically all the advantages of pyrolytic graphite, but is much easier, faster and therefore more economical to manufacture than an equivalent carrier body with a ring made of solid, i.e. thick-walled pyrolytic graphite .
  • the base body consists of a laminate of graphite foils at least in the area below the focal path.
  • Graphite foils are from Angew. Chem. 12 (1970) 404-405. They are made from so-called graphite expandate without binders by rolling under high compression pressure. Raw materials are chemically expanded flakes made of natural graphite. The expansion consists in an expansion of the layer structure of the graphite in the direction of the crystallographic c-axes up to a multiple of the original thickness.
  • Such graphite foils and laminates made from such foils are commercially available (company brochures "Sigraflex” from Sigri EleKtrographit GmbH and “Papyer” from Le Carbone-Lorraine). What is remarkable about such films is, among other things, their pronounced anisotropy of the physical properties.
  • the high thermal conductivity parallel to the layering, ie to the film surface is of particular importance for the application according to the invention. This is about 1.5 W / cmK and thus reaches a value of around 50% of the thermal conductivity of well-oriented pyrolytic graphite (2.5 to 4 W / cmK).
  • the thermal conductivity of molybdenum, one for rotating anode disks common material is 1.4 W / cmK and that of tungsten is 1.3 W / cmK.
  • the values given for the thermal conductivity of graphite laminate on the one hand and pyrolytic graphite on the other hand correspond to the associated density values of approximately 1.0 g cm -3 for the laminate and 2.0 to 2.2 g cm -3 for pyrolytic graphite.
  • a composite body consisting of graphite foils, solidified with enveloping layers of pyrolytic graphite, parallel to the stratification, has a thermal conductivity that at least corresponds to that of conventional tungsten / molybdenum composite anodes, but is generally larger.
  • the base body consists of a carrier body, on which a band-shaped graphite foil is wound in a thickness that corresponds at least to the width of the focal track.
  • the whole thing is covered with a coating of pyrolytic graphite.
  • the resulting composite body is then covered by e.g. provided with a focal sheet with tungsten.
  • parts or segments which are cut out from blocks which in turn consist of graphite foil stacked in stacks and a coating of pyrolytic graphite, are assembled to form an annular body which, taking into account the preferred orientation, closes to the carrier body the basic body is composed.
  • the layer of a high-melting metal, on the surface of which the focal spot path runs when the tube is in operation is arranged in the former case on the top and / or bottom surface (as a circular surface), while in the latter case - depending on the type of tube - an arrangement on the outer cylinder surface is also possible.
  • a material that is suitable for the pyrolytic coating is required for the carrier body.
  • Graphite is preferably used for this, but other high-temperature resistant materials, such as e.g. special ceramic bodies or high-melting metals such as molybdenum are suitable.
  • the rotating anode shown in FIG. 1 is attached to a rotating shaft 1.
  • the basic body of the rotating anode consists of a carrier body 2, which has the shape of a circular disc and consists of electrographite, and a ring 3 made of stacked graphite foil, the ring 3 being arranged on the periphery of the carrier body 2.
  • the base body is covered with a layer of pyrolytic graphite, not shown.
  • An annular layer 4 of tungsten is arranged on this layer above the ring 3.
  • a band-shaped graphite foil 3 is in need on a carrier body 2 manoeuvrable thickness.
  • the whole is then subjected to a coating (not shown) with pyrolytic graphite, the duration of the coating depending on the required solidification.
  • the resulting composite body is then brought into an optimal shape for machining with tungsten (using CVD or soldering technology) by machining (turning, grinding).
  • the basic body according to FIG. 3 is produced as follows:
  • the graphite foil is layered into stacks and solidified into blocks by coating with pyrolytic graphite. Parts or segments 3 are cut out from such blocks in such a way that they can be put together with a carrier body 2 to form a base body, taking into account the preferred orientation.

Landscapes

  • X-Ray Techniques (AREA)
EP81201150A 1980-10-29 1981-10-19 Anode tournante pour tube à rayons-X Expired EP0050893B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3040719 1980-10-29
DE19803040719 DE3040719A1 (de) 1980-10-29 1980-10-29 Roentgenroehren-drehanode

Publications (2)

Publication Number Publication Date
EP0050893A1 true EP0050893A1 (fr) 1982-05-05
EP0050893B1 EP0050893B1 (fr) 1985-01-09

Family

ID=6115449

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201150A Expired EP0050893B1 (fr) 1980-10-29 1981-10-19 Anode tournante pour tube à rayons-X

Country Status (4)

Country Link
US (1) US4461019A (fr)
EP (1) EP0050893B1 (fr)
JP (1) JPS57103252A (fr)
DE (2) DE3040719A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2593638A1 (fr) * 1986-01-30 1987-07-31 Lorraine Carbone Support pour anticathode tournante de tubes a rayons x
FR2625035A1 (fr) * 1987-12-22 1989-06-23 Thomson Cgr Anode tournante en materiau composite pour tube a rayons x

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6052434A (en) * 1996-12-27 2000-04-18 Toth; Thomas L. X-ray tube target for reduced off-focal radiation
US6212753B1 (en) * 1997-11-25 2001-04-10 General Electric Company Complaint joint for interfacing dissimilar metals in X-ray tubes
US6542576B2 (en) * 2001-01-22 2003-04-01 Koninklijke Philips Electronics, N.V. X-ray tube for CT applications
DE102005039188B4 (de) * 2005-08-18 2007-06-21 Siemens Ag Röntgenröhre

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2152049A1 (de) * 1971-10-19 1973-04-26 Siemens Ag Drehanoden-roentgenroehre
DE2910138A1 (de) * 1979-03-15 1980-09-25 Philips Patentverwaltung Anodenscheibe fuer eine drehanoden- roentgenroehre

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US196425A (en) * 1877-10-23 Improvement in metal-plated carbons for electrical illuminating-points
FR93507E (fr) * 1956-03-30 1969-04-11 Radiologie Cie Gle Perfectionnements aux anodes de tubes a décharge et en particulier aux anodes de tubes radiogenes.
DE2146918B2 (de) * 1971-09-20 1978-06-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Roentgenroehren-drehanode
FR2242775A1 (en) * 1973-08-31 1975-03-28 Radiologie Cie Gle Rotary anode for X-ray tubes - using pseudo-monocrystalline graphite for better heat conduction
US3934164A (en) * 1975-02-14 1976-01-20 The Machlett Laboratories, Incorporated X-ray tube having composite target
DE2928993C2 (de) * 1979-07-18 1982-12-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren zur Herstellung einer Röntgenröhren-Drehanode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2152049A1 (de) * 1971-10-19 1973-04-26 Siemens Ag Drehanoden-roentgenroehre
DE2910138A1 (de) * 1979-03-15 1980-09-25 Philips Patentverwaltung Anodenscheibe fuer eine drehanoden- roentgenroehre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2593638A1 (fr) * 1986-01-30 1987-07-31 Lorraine Carbone Support pour anticathode tournante de tubes a rayons x
EP0236241A1 (fr) * 1986-01-30 1987-09-09 Le Carbone Lorraine Support pour anticathode tournante de tubes à rayons X
FR2625035A1 (fr) * 1987-12-22 1989-06-23 Thomson Cgr Anode tournante en materiau composite pour tube a rayons x
EP0322280A1 (fr) * 1987-12-22 1989-06-28 General Electric Cgr S.A. Anode tournante en matériau composite pour tube à rayons X
US4958364A (en) * 1987-12-22 1990-09-18 General Electric Cgr Sa Rotating anode of composite material for X-ray tubes

Also Published As

Publication number Publication date
US4461019A (en) 1984-07-17
JPS57103252A (en) 1982-06-26
DE3040719A1 (de) 1982-05-19
EP0050893B1 (fr) 1985-01-09
DE3168190D1 (en) 1985-02-21

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