US3875444A - Rotating x-ray anode having a target area made of a tungsten rhenium tantalum alloy - Google Patents

Rotating x-ray anode having a target area made of a tungsten rhenium tantalum alloy Download PDF

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Publication number
US3875444A
US3875444A US418584A US41858473A US3875444A US 3875444 A US3875444 A US 3875444A US 418584 A US418584 A US 418584A US 41858473 A US41858473 A US 41858473A US 3875444 A US3875444 A US 3875444A
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United States
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weight
tungsten
rhenium
target area
rotating
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US418584A
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English (en)
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Frederik Magendans
Rheenen Bernhard Josef Pie Van
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US Philips Corp
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US Philips Corp
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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

  • Rotating anodes of this type are described in Netherlands Patent Specification No. 127,039.
  • rotating anodes provided with a target area for the electrons which is made of tungsten containing from 1 to 5% by weight of rhenium are roughened only at greatly increased loads owing to the cold ductility of this alloy.
  • the most effective rhenium content lies at approximately by weight, because with this alloy the so-called dose losses are not appreciably smaller than with alloys containing a higher percentage of rhenium.
  • melting phenomena in the path of the focal spot which also may give rise to dose losses are produced only at far higher loads (cf.
  • Rhenium is a very expensive metal and the content of 10% by weight as used in practice is one of the main causes of the high prices of rotating anodes for X-ray tubes. Reducing the rhenium content to percentages by weight between 1 and 5 in general entails a deterioration of rotating anodes for X-ray tubes made of such alloys. Not only are the dose losses increased at the same number of loads compared with the use of alloys containing 10% by weight of rhenium (see FIG. 9 in the aforementioned paper), but also this deterioration generally sets in at a slightly earlier stage.
  • the high-tem perature resistance of alloys containing smaller percentages of rhenium is lower, so that the so-called dishing effect of the rotating anodes also has to be taken into account.
  • the dishing effect causes the angle of the path of the focal spot relative to the rotating anode to be changed. This also gives rise to dose losses.
  • a rotating anode for an X-ray tube which satisfies the requirement according to the invention is characterized in that the target area is made of a ternary tungsten alloy containing from 1 to 5% by weight of rhenium and from 0.l to 4% by weight of tantalum, the remainder being tungsten.
  • the alloy from which the target area for the electrons is made comprises from 2.5 to 3.5% by weight of rhenium and from 0.1 to 2% by weight of tantalum, the remainder being tungsten. These alloys give the best results.
  • target area is used to mean at least the area of impact of the electrons, the so-called focal spot path.
  • the support for the rotating anode of an X-ray tube preferably is made of a molybdenum alloy having a high thermal resistance, a high recrystallisation temperature and a transition from brittle to ductile at a temperature below room temperature.
  • suitable alloys are alloys containing small amounts of titanium, zirconium and carbon,such as the alloys known under the trade names TZM and TZC the compositions of which are stated to be from 0.40 to 0.50% by weight of titanium and from 0.06 to 0.12% by weight of zirconium, the remainder being molybdenum, and about 1.25% by weight of titanium, from 0.5 to 0.25% by weight of zirconium and from 0.15 to 0.30% by weight of carbon, the remainder being molybdenum, respectively.
  • a rotating anode according to the invention is preferably manufactured by joining a disc made of the ternary tungsten alloy to a disc made mainly of molybdenum by cold deformation by means of a single blow of large energy content between plane die blocks with reduction in thickness and increase in diameter of both discs. From the resulting disc a rotating anode is manufactured in a known manner.
  • a support made of carbon or graphite may also be used, the target area being secured to the support, for example, by brazing or by another method known for this purpose.
  • a rotating anode was manufactured which comprises a target area made of a ternary tungsten alloy containing 3% by weight of rhenium and 0.4% by weight of tantalum, the remainder being tungsten, and a support made of a molybdenum alloy containing 0.5% by weight of titanium and 0.08% by weight of zirconium, the remainder being molybdenum. Tests have shown that after an equal number of loads of equal type this rotating anode has smaller dose losses than a rotating anode of equal structure provided with a target area made of a tungsten rhenium alloy containing by weight of rhenium.
  • FIGURE of the accompanying drawing shows curves which show the relationship between dose yield D in rontgen per second, plotted linearly along the vertical axis, and the number of loads B, plotted logarithmically along the horizontal axis.
  • the curve 1 relates to a rotating anode as described in Example I and the curve 2 rotates to a rotating anode as described in Example ll.
  • the other curves in the FIGURE relate to rotating anodes having target areas which respectively consist in curve 3 of tungsten in curve 4 of a tungsten-tantalum alloy containing 0.33% by weight of tantalum, the remainder being tungsten,
  • a rotating anode for an X-ray tube in which at least the target area for electrons is made of a ternary alloy consisting essentially of about i to 5% by weight of rhenium, about 0.l to 4% by weight of tantalum, and the balance tungsten.

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  • X-Ray Techniques (AREA)
  • Solid Thermionic Cathode (AREA)
  • Particle Accelerators (AREA)
US418584A 1972-12-06 1973-11-23 Rotating x-ray anode having a target area made of a tungsten rhenium tantalum alloy Expired - Lifetime US3875444A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7216500A NL7216500A (ko) 1972-12-06 1972-12-06

Publications (1)

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US3875444A true US3875444A (en) 1975-04-01

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US418584A Expired - Lifetime US3875444A (en) 1972-12-06 1973-11-23 Rotating x-ray anode having a target area made of a tungsten rhenium tantalum alloy

Country Status (11)

Country Link
US (1) US3875444A (ko)
JP (2) JPS4989494A (ko)
AT (1) AT338941B (ko)
BE (1) BE808201A (ko)
CA (1) CA1009870A (ko)
CH (1) CH566074A5 (ko)
DE (1) DE2357292C3 (ko)
FR (1) FR2210009B1 (ko)
GB (1) GB1395138A (ko)
IT (1) IT999875B (ko)
NL (1) NL7216500A (ko)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023065A1 (de) * 1979-07-19 1981-01-28 Philips Patentverwaltung GmbH Drehanode für Röntgenröhren
US4534993A (en) * 1983-01-25 1985-08-13 U.S. Philips Corporation Method of manufacturing a rotary anode for X-ray tubes and anode thus produced
US4719331A (en) * 1983-07-29 1988-01-12 Ngk Spark Plug Co., Ltd. Ceramic glow plug having a tungsten-rhenium alloy heating wire
US5917198A (en) * 1996-03-29 1999-06-29 Nec Corporation Gate electrodes and matrix lines made of W/Ta alloy for LCD apparatus
DE4316083B4 (de) * 1992-05-15 2006-04-13 Scan-Tech S.A. Radiometrische Meßvorrichtung für Dickenmessungen
US20090086919A1 (en) * 2007-10-02 2009-04-02 Gregory Alan Steinlage Apparatus for x-ray generation and method of making same
WO2011070475A1 (en) * 2009-12-07 2011-06-16 Koninklijke Philips Electronics N.V. Alloy comprising two refractory metals, particularly w and ta and x-ray anode comprising such alloy and method for producing same.
US9117624B2 (en) 2007-10-02 2015-08-25 General Electric Company Apparatus for X-ray generation and method of making same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109058A (en) * 1976-05-03 1978-08-22 General Electric Company X-ray tube anode with alloyed surface and method of making the same
NL7906417A (nl) * 1979-08-27 1981-03-03 Philips Nv Werkwijze voor het vervaardigen van een draaianode voor roentgenbuizen en zo verkregen anode.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136907A (en) * 1961-01-05 1964-06-09 Plansee Metallwerk Anticathodes for X-ray tubes
US3160501A (en) * 1961-09-15 1964-12-08 Westinghouse Electric Corp Tungsten-rhenium-tantalum alloys
US3374092A (en) * 1965-10-22 1968-03-19 Atomic Energy Commission Usa High temperature brazing alloys for tungsten and tantalum and alloys thereof
US3397338A (en) * 1964-02-26 1968-08-13 Siemens Ag Rotary anode plate for X-ray tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136907A (en) * 1961-01-05 1964-06-09 Plansee Metallwerk Anticathodes for X-ray tubes
US3160501A (en) * 1961-09-15 1964-12-08 Westinghouse Electric Corp Tungsten-rhenium-tantalum alloys
US3397338A (en) * 1964-02-26 1968-08-13 Siemens Ag Rotary anode plate for X-ray tubes
US3374092A (en) * 1965-10-22 1968-03-19 Atomic Energy Commission Usa High temperature brazing alloys for tungsten and tantalum and alloys thereof

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023065A1 (de) * 1979-07-19 1981-01-28 Philips Patentverwaltung GmbH Drehanode für Röntgenröhren
US4534993A (en) * 1983-01-25 1985-08-13 U.S. Philips Corporation Method of manufacturing a rotary anode for X-ray tubes and anode thus produced
US4719331A (en) * 1983-07-29 1988-01-12 Ngk Spark Plug Co., Ltd. Ceramic glow plug having a tungsten-rhenium alloy heating wire
DE4316083B4 (de) * 1992-05-15 2006-04-13 Scan-Tech S.A. Radiometrische Meßvorrichtung für Dickenmessungen
US5917198A (en) * 1996-03-29 1999-06-29 Nec Corporation Gate electrodes and matrix lines made of W/Ta alloy for LCD apparatus
US20090086919A1 (en) * 2007-10-02 2009-04-02 Gregory Alan Steinlage Apparatus for x-ray generation and method of making same
US7720200B2 (en) * 2007-10-02 2010-05-18 General Electric Company Apparatus for x-ray generation and method of making same
US9117624B2 (en) 2007-10-02 2015-08-25 General Electric Company Apparatus for X-ray generation and method of making same
WO2011070475A1 (en) * 2009-12-07 2011-06-16 Koninklijke Philips Electronics N.V. Alloy comprising two refractory metals, particularly w and ta and x-ray anode comprising such alloy and method for producing same.
CN102639730A (zh) * 2009-12-07 2012-08-15 皇家飞利浦电子股份有限公司 包含两种难熔金属特别是W和Ta的合金和包含此类合金的X射线阳极及其生产方法
US20120236997A1 (en) * 2009-12-07 2012-09-20 Koninklijke Philips Electronics N.V. Alloy comprising two refractory metals, particularly w and ta and x-ray anode comprising such alloy and method for producing same

Also Published As

Publication number Publication date
JPS4989494A (ko) 1974-08-27
CA1009870A (en) 1977-05-10
DE2357292A1 (de) 1974-06-12
AT338941B (de) 1977-09-26
JPS541380U (ko) 1979-01-06
DE2357292C3 (de) 1981-02-19
IT999875B (it) 1976-03-10
FR2210009B1 (ko) 1977-08-05
DE2357292B2 (de) 1980-05-29
JPS5642933Y2 (ko) 1981-10-07
CH566074A5 (ko) 1975-08-29
BE808201A (fr) 1974-06-04
GB1395138A (en) 1975-05-21
NL7216500A (ko) 1974-06-10
FR2210009A1 (ko) 1974-07-05
ATA1009273A (de) 1977-01-15

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