US3397338A - Rotary anode plate for X-ray tubes - Google Patents

Rotary anode plate for X-ray tubes Download PDF

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Publication number
US3397338A
US3397338A US435178A US43517865A US3397338A US 3397338 A US3397338 A US 3397338A US 435178 A US435178 A US 435178A US 43517865 A US43517865 A US 43517865A US 3397338 A US3397338 A US 3397338A
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United States
Prior art keywords
osmium
tungsten
rhenium
alloy
anode plate
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.)
Expired - Lifetime
Application number
US435178A
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English (en)
Inventor
Elsas Adolf Friedrich
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
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Publication of US3397338A publication Critical patent/US3397338A/en
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/30—Non-electron-emitting electrodes; Screens characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/002—Chemical composition and manufacture chemical

Definitions

  • ABSTRACT OF THE DISCLOSURE A rotary anode plate for X-ray tubes in which at least the electron impact surface is formed of a high melting alloy which consists of tungsten, osmium, and another high melting metal, such as rhenium.
  • the invention is concerned with a rotary anode plate for X-ray tubes in which, at least, the electron impact surface consists of an alloy of refractory metals.
  • a reduction of costs for anode plates in which at least the electron impact surface is formed by an alloy of high-melting ;metals was obtained by using an alloy of tungsten-osmium containing at least a tungsten content of 65%, an osmium content of up to approximately, and a content of 0 up to 25% of one or several high-melting metals.
  • tungsten alloys containing additives to increase ductility a portion of up to 25% of the tungsten content can be replaced by one or several other high-melting metals and that in accordance with the invention the osmium content shall amount to about 10%, a tungsten content of up to 65% is attained.
  • tungsten-osmium alloy By using a tungsten-osmium 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 osmium 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 osmium as compared with rhenium. However, it is surprising to see that already 1% of osmium suflices to obtain the effect which is achieved by adding 5 to 10% rhenium.
  • a tube whose anode plate is provided with an electron impact surface made of a tungsten-osmium alloy, osmium accounting for 1% shows after 10,000 loadings a decrease of the radiation output which is also found in tubes whose electron impact 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 3,397,338 Patented Aug. 13, 1968 the invention by the possibility of lessening by factor 5 to 10 the quantity of osmium required for the improvement and the alloy without experiencing an impairment of the properties.
  • the osmium content can be limited to 10% because this percentage allows the desired improvement to be obtained to such an extent that increasing the osmium content would no longer prove rewarding economically. Apart from this, if the osmium content is increased considerably in excess of 10%, this would lower the melting point and the heat conductivity, two factors tending to lessen the tube rating. When the limit of 10% of the osmium content is exceeded slightly, this would still fall within the scope of the invention.
  • Such alloys may have a composition with tungsten accoun ing for with osmium accounting up to about 10%, and with a portion of other metals, let us say rhenium, ranging from 0 to about 10%.
  • An osmium content of 1% can also replace the elfect of 5 up to 10% rhenium.
  • the additional osmium portion may amount to 0.1 up to about 10%.
  • 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 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 an 1 mm.
  • 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 tungstenosrnium alloy containing up to 10% osmium.
  • 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 tungstenrhenium-osmium alloy containing up to 25% rhenium, up to 10% osmium and the remainder of tungsten.
  • An X-ray tube having an anode body with an ex- 3 posed 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 tungstenrhenium-osmium alloy containing from 1 to 10% rhenium, .1 to 10% osmium and the remainder of tungsten.

Landscapes

  • X-Ray Techniques (AREA)
  • Solid Thermionic Cathode (AREA)
US435178A 1964-02-26 1965-02-25 Rotary anode plate for X-ray tubes Expired - Lifetime US3397338A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1964S0089704 DE1458475B2 (de) 1964-02-26 1964-02-26 Verwendung einer wolframlegierung fuer die dreh- bzw.stehanode einer roentgenroehre

Publications (1)

Publication Number Publication Date
US3397338A true US3397338A (en) 1968-08-13

Family

ID=7515296

Family Applications (1)

Application Number Title Priority Date Filing Date
US435178A Expired - Lifetime US3397338A (en) 1964-02-26 1965-02-25 Rotary anode plate for X-ray tubes

Country Status (6)

Country Link
US (1) US3397338A (de)
AT (1) AT251715B (de)
CH (1) CH465724A (de)
DE (1) DE1458475B2 (de)
FR (1) FR1427320A (de)
GB (1) GB1099655A (de)

Cited By (4)

* 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
US3737699A (en) * 1972-05-18 1973-06-05 Picker Corp X-ray tube having anode target layer of molybdenum rhenium alloy
US3875444A (en) * 1972-12-06 1975-04-01 Philips Corp Rotating x-ray anode having a target area made of a tungsten rhenium tantalum alloy
US3887723A (en) * 1972-03-22 1975-06-03 Richard B Kaplan Method of fabrication of composite anode for rotating-anode x-ray tubes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US648660A (en) * 1899-08-07 1900-05-01 Reginald A Fessenden X-ray apparatus.
US2863083A (en) * 1956-03-30 1958-12-02 Radiologie Cie Gle X-ray genenrator tubes
US3136907A (en) * 1961-01-05 1964-06-09 Plansee Metallwerk Anticathodes for X-ray tubes
US3320098A (en) * 1965-02-24 1967-05-16 William C Kuhlman Tungsten-osmium thermocouple and element thereof
US3328626A (en) * 1963-09-02 1967-06-27 Schwarzkopf Dev Co Rotary anodes of x-ray tubes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US648660A (en) * 1899-08-07 1900-05-01 Reginald A Fessenden X-ray apparatus.
US2863083A (en) * 1956-03-30 1958-12-02 Radiologie Cie Gle X-ray genenrator tubes
US3136907A (en) * 1961-01-05 1964-06-09 Plansee Metallwerk Anticathodes for X-ray tubes
US3328626A (en) * 1963-09-02 1967-06-27 Schwarzkopf Dev Co Rotary anodes of x-ray tubes
US3320098A (en) * 1965-02-24 1967-05-16 William C Kuhlman Tungsten-osmium thermocouple and element thereof

Cited By (4)

* 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
US3887723A (en) * 1972-03-22 1975-06-03 Richard B Kaplan Method of fabrication of composite anode for rotating-anode x-ray tubes
US3737699A (en) * 1972-05-18 1973-06-05 Picker Corp X-ray tube having anode target layer of molybdenum rhenium alloy
US3875444A (en) * 1972-12-06 1975-04-01 Philips Corp Rotating x-ray anode having a target area made of a tungsten rhenium tantalum alloy

Also Published As

Publication number Publication date
DE1458475A1 (de) 1969-05-08
GB1099655A (en) 1968-01-17
DE1458475B2 (de) 1972-06-22
FR1427320A (fr) 1966-02-04
CH465724A (de) 1968-11-30
AT251715B (de) 1967-01-25

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