US3414754A - Anode plate for x-ray tubes - Google Patents

Anode plate for x-ray tubes Download PDF

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Publication number
US3414754A
US3414754A US594816A US59481666A US3414754A US 3414754 A US3414754 A US 3414754A US 594816 A US594816 A US 594816A US 59481666 A US59481666 A US 59481666A US 3414754 A US3414754 A US 3414754A
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United States
Prior art keywords
iridium
tungsten
alloy
anode
impact surface
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Expired - Lifetime
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US594816A
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English (en)
Inventor
Elsas Adolf
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Siemens AG
Siemens Corp
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Siemens Corp
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Publication date
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    • 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

Definitions

  • a reduction of costs for anode plates in which at least the electron impact surface is formed by an alloy of refractory metals was obtained by using an alloy of tungsten-iridium containing a tungsten content up to 99.95% and an iridium content from 0.05 to 3% approximately.
  • the preferred content of iridium is 0.1 to 1%.
  • tungsten alloys containing additives to increase ductibility a portion of up to 25% of the tungsten content can be replaced by one or several other refractory metals and that in accordance with the invention the iridium content shall amount to about 3%, a tungsten content of up to 72% is attained.
  • tungsten-iridium alloy By using a tungsten-iridium alloy a metal of greater hardness is produced as compared with tungsten-rhenium alloys. According to the opinion on the effect of the tungsten-rhenium alloy an impairment of the anode plate would develop when iridium is used as alloy ingredient. Moreover, an unfavourable reduction of the usability of the alloy would be brought about because of the lower melting point of iridium an compared with rhenium. However, it is surprising to see that already 0.3% of iridium sufiices to obtain the effect which is achieved by adding 5 to rhenium.
  • a tube whose anode plate is provided with an electron impact surface made of a tungsten-iridium alloy, iridium accounting for 0.3% shows after 24,000 loadings a decrease of the radiation output which is also found in tubes whose electron im- 3,414,754 Patented Dec. 3, 1968 pact surface is formed by a rhenium-tungsten alloy, the rhenium content accounting for 10%.
  • a cost reduction is obtained for the anode plates made in accordance with the invention by the possibility of lessening by a factor of 15 to 30 the quantity of iridium required for the improvement in the alloy without experiencing an impairment of the properties.
  • the iridium content can be limited to 3% because this percentage allows the desired improvement to be obtained to such an extent that increasing the iridium content would no longer prove rewarding economically. Apart from this, if the iridium content is increased considerably in excess of 3%, this would lower the melting point and the heat conductivity, factors tending to lessen the tube rating. When the limit of 3% of the iridium content is exceeded slightly, the quality of the alloy is changed also only slightly and therefore this would still fall within the scope of the invention.
  • a surface layer usually 0.1 to 2 mm. thick, is applied to a base of tungsten or molybdenum or an alloy of these metals.
  • a surface layer usually 0.1 to 2 mm. thick, is applied to a base of tungsten or molybdenum or an alloy of these metals.
  • the accompanying illustration shows an example of a rotary anode tube 1 embodying the inventive idea and representing a sectional view with a cut-away envelope and rotary anode plate.
  • the glass envelope 2 embraces cathode 3 fitted at one envelope end with leads 4 and the rotary anode 5 fitted at the other end.
  • Both envelopes 2 and cathode 3 as well as rotary anode 5, consisting of rotor '6 and anode plate 7, are arranged and supported in a known manner.
  • Plate 7 is provided with carrier 8 made of molybdenum and tungsten alloy which contains 5% tungsten and molybdenum and the unavoidable impurities.
  • Electron impact surfaces 10 and 11, which are differently inclined with respect to plate spindle 9, are formed of a 1 mm.
  • the layer 12 is formed of an alloy, which is an example embodying the inventive alloy of tungsten and iridium with tungsten accounting at least 87%, iridium up to 3% and molybdenum up to 10% approximately.
  • an improved loadability it is also possible to provide stationary anodes of X-ray tubes with an impact surface containing iridium.
  • An anode plate for X-ray tubes in which at least the electron impact surface consists of refractory metal alloy, the alloy being formed of tungsten-iridium with tungsten accounting up to 99.95 percent and with iridium accounting from 0.05 up to 3 percent approximately.
  • An anode plate for X-ray tubes according to claim 1 which consists of a tungsten-iridium alloy also outside its electron impact surface.
  • a rotary anode X-ray tube having an anode plate in which at least the electron impact surface is formed of a tungsten-iridium alloy with tungsten accounting up to 99.95 percent and with iridium accounting from 005 up to 3 percent approximately.
  • a rotary anode X-ray tube having an anode plate according to claim 1 which consists of a tungsten-iridium alloy also outside its electron impact surface.
  • An anode plate for X-ray tubes having an anode body with an exposed electron impact surface, and electron beam means for producing an electron beam impinging on said surface and causing emission of X-rays therefrom; said electron impact surface consisting of an alloy of tungsten, iridium, and a refractory metal wherein iridium comprises 0.05 to 3% of the alloy and at least 75% of the remainder consists of tungsten.
  • An anode plate for X-ray tubes having an anode body with an exposed electron impact surface, and electron beam means for producing an electron beam impinging on said surface and causing emission of X-rays therefrom; said electron impact surface consisting of a tungsten-mo]ybdenum-iridium alloy containing up to 10% molybdenum, 0.05 to 3% iridium, and the remainder of tungsten.
  • An X-ray tube having an anode body with an exposed electron impact surface, and electron beam means for producing an electron beam impinging on said surface and causing emission of X-rays therefrom; said electron impact surface consisting of a tungsten-iridium alloy containing up to 99.9% tungsten and from 0.1 to 1% iridium.
  • An X-ray tube having an anode body with an exposed electron impact surface, and electron beam means for producing an electron beam impinging on said surface and causing emission of X-rays therefrom; said electron impact surface consisting of a tungsten-iridium alloy containing 99.7% tungsten and 0.3% iridium.
  • An X-ray tube having an anode body with an exposed electron impact surface, and electron beam means for producing an electron beam impinging on said surface and causing emission of X-rays therefrom; said electron impact surface consisting of an alloy of iridium and another refractory metal and consisting of 0.05 to 3% iridium and tungsten in an amount of at least 75 of the remainder.

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  • Solid Thermionic Cathode (AREA)
  • X-Ray Techniques (AREA)
US594816A 1965-11-20 1966-11-16 Anode plate for x-ray tubes Expired - Lifetime US3414754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0100578 1965-11-20

Publications (1)

Publication Number Publication Date
US3414754A true US3414754A (en) 1968-12-03

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US594816A Expired - Lifetime US3414754A (en) 1965-11-20 1966-11-16 Anode plate for x-ray tubes

Country Status (6)

Country Link
US (1) US3414754A (de)
AT (1) AT264673B (de)
CH (1) CH463631A (de)
DE (1) DE1483302C3 (de)
FR (1) FR1501301A (de)
GB (1) GB1169029A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660053A (en) * 1968-12-02 1972-05-02 Schwarzkopf Dev Co Platinum-containing x-ray target
US3689795A (en) * 1970-06-02 1972-09-05 Schwarzkopf Dev Co Boron-containing rotating x-ray target
US5065419A (en) * 1987-06-26 1991-11-12 General Electric Cgr S.A. X-ray tube with low extra-focal radiation
WO2010018502A1 (en) * 2008-08-14 2010-02-18 Philips Intellectual Property & Standards Gmbh Multi-segment anode target for an x-ray tube of the rotary anode type with each anode disk segment having its own anode inclination angle with respect to a plane normal to the rotational axis of the rotary anode and x-ray tube comprising a rotary anode with such a multi-segment anode target
US12512289B2 (en) * 2023-09-07 2025-12-30 GE Precision Healthcare LLC X-ray tube anode with optimized area focal spot track

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2691247B1 (fr) * 1992-05-15 1997-03-14 Scan Tech Sa Jauge radiometrique de mesure d'epaisseur.
DE19745998A1 (de) * 1997-10-20 1999-03-04 Siemens Ag Verwendung einer Röntgenröhre und für diese Verwendung vorgesehene Röntgenröhre

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1218026A (en) * 1916-10-05 1917-03-06 Fred A Wiggin X-ray tube.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1218026A (en) * 1916-10-05 1917-03-06 Fred A Wiggin X-ray tube.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660053A (en) * 1968-12-02 1972-05-02 Schwarzkopf Dev Co Platinum-containing x-ray target
US3689795A (en) * 1970-06-02 1972-09-05 Schwarzkopf Dev Co Boron-containing rotating x-ray target
US5065419A (en) * 1987-06-26 1991-11-12 General Electric Cgr S.A. X-ray tube with low extra-focal radiation
WO2010018502A1 (en) * 2008-08-14 2010-02-18 Philips Intellectual Property & Standards Gmbh Multi-segment anode target for an x-ray tube of the rotary anode type with each anode disk segment having its own anode inclination angle with respect to a plane normal to the rotational axis of the rotary anode and x-ray tube comprising a rotary anode with such a multi-segment anode target
US20110135066A1 (en) * 2008-08-14 2011-06-09 Koninklijke Philips Electronics N.V. Multi-segment anode target for an x-ray tube of the rotary anode type with each anode disk segment having its own anode inclination angle with respect to a plane normal to the rotational axis of the rotary anode and x-ray tube comprising a rotary anode with such a multi-segment anode target
US8520803B2 (en) 2008-08-14 2013-08-27 Koninklijke Philips N.V. Multi-segment anode target for an X-ray tube of the rotary anode type with each anode disk segment having its own anode inclination angle with respect to a plane normal to the rotational axis of the rotary anode and X-ray tube comprising a rotary anode with such a multi-segment anode target
US12512289B2 (en) * 2023-09-07 2025-12-30 GE Precision Healthcare LLC X-ray tube anode with optimized area focal spot track

Also Published As

Publication number Publication date
DE1483302B2 (de) 1975-02-27
DE1483302A1 (de) 1970-01-08
AT264673B (de) 1968-09-10
DE1483302C3 (de) 1975-10-16
CH463631A (de) 1968-10-15
GB1169029A (en) 1969-10-29
FR1501301A (fr) 1967-11-10

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