US3820919A - Zirconium carbon getter member - Google Patents

Zirconium carbon getter member Download PDF

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Publication number
US3820919A
US3820919A US00207022A US20702271A US3820919A US 3820919 A US3820919 A US 3820919A US 00207022 A US00207022 A US 00207022A US 20702271 A US20702271 A US 20702271A US 3820919 A US3820919 A US 3820919A
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United States
Prior art keywords
getter
container
carbon
zirconium
mass
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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
US00207022A
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English (en)
Inventor
H Katz
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Siemens AG
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Siemens AG
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Filing date
Publication date
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Publication of US3820919A publication Critical patent/US3820919A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering

Definitions

  • a getter member comprised of an open-ended container composed for example of molybdenum or carbon, having a sint'ered porous mass composed of a mixture of zirconium and up to about 30 percent by weight carbon therein.
  • the getter member is nonevaporable and operable at room temperatures so as to be positionable at any desired location within an electric discharge tube. Means for securing the getter material within its container is also disclosed.
  • the invention relates to getters and more particularly to getter members operable at room temperatures in electric discharge tubes.
  • the invention provides non-evaporating getter members that substantially eliminate the prior art drawbacks.
  • the invention provides non-evaporating getter members comprised of substantially open-ended container of molybdenum or carbon having a porous sintered getter material therein comprised of a mixture of zirconium and up to about 30 percent carbon.
  • the getter members of the invention are operable at room temperatures and are attached to a desired position of an electric discharge tube without heating devices.
  • the adhesion between the container and the getter material is sufficiently great so that as a general matter, no special securement is required to insure retention of the getter material within the container. However, with particularly valuable tubes, such securement is reassuring.
  • certain embodiments of the invention include means of securing the getter material within the container, such as wires, cap-like structures, shaped bars or similar members attached to the container and holding the getter material therein.
  • the securing means can be attached to the container and sintered in with the getter material or be attached after the getter material has been sintered.
  • FIG. 1 is an elevated sectional view of an embodiment constructed in accordance with the principles of the invention
  • FIG. 2 is a somewhat similar view of another embodiment of the invention.
  • FIG. 3 is also a similar view of yet another embodiment of the invention.
  • FIG. 4 is a similar view of a further embodiment of the invention.
  • FIG. 5 is a partial elevated sectional view of another embodiment of the invention.
  • FIG. 6 is a view somewhat similar to FIG. 5 of a further embodiment of the invention.
  • FIG. 7 is an elevated sectional view of a further embodiment of the invention.
  • FIG. 8 is a somewhat similar view of a modified form of the invention illustrated at FIG. 7;
  • FIG. 9 is a partial elevated sectional view of another embodiment of the invention.
  • the invention provides getter members operable at room temperatures in electric discharge tubes or the like wherein the getter material is positioned within a substantially open-ended container, for example, in an open-ended recess of a sheet-metal container that is readily securable to operating portions or to other portions of an electric discharge tube.
  • the nonevaporating getter material of the invention is comprised of a mixture of zirconium and up to about 30 percent by weight carbon (graphite) sintered into a highly porous mass.
  • the container is composed of relatively high temperature resistant material, such as molybdenum or carbon and is attachable at a desired position within an electric discharge tube. Heating devices are not necessary for the getter members of the invention.
  • the adhesion between the-container and the getter material mass is of a sufficient-strength so that generally no securing means therebetween is required.
  • various types of securing means are provided to prevent the getter material mass from falling out of the container.
  • the securing means include wires, sheet-caps, rods, Z-shaped or U-'shaped bars as well as other similar structures generally composed of molybdenum, tantalum or other similar metals.
  • the securing means are attached to the container by various means, such as spotwelding, crimping, passing through portions thereof, etc., and are attached to the getter material by being embedded therein or by contacting a surface portion thereof.
  • the securing means are attached to the getter material either prior to the sintering process and sintered in with the getter material or are suitably attached after the sintering process.
  • the invention results from systematic investigations with zirconium-carbon mixtures conventionally applied to arrangements that are adapted for periodic, repeated or continuous heating, for example, as applied to a heating coil insulated with aluminum oxide. It was discovered that a large getter capacity can be obtained from such a mixture without heating.
  • the zirconiumcarbon mixtures have getter characteristics, particularly when in a large pore sintered state, that are suited for production of getter members operable at room temperatures. Such getter members are heated only once during the production of a particular discharge tube and are thereby freed of their own gases to such a degree that they have a sufficiently large capacity for additional gases, even in a cold state over extended periods of time.
  • composition of the zirconium-carbon mixture is relatively broad and varies from about a minimum of percent by weight of zirconium and a maximum of about 30 percent carbon.
  • the maximum amount of zirconium in the mixture is about to percent while the minimum amount of carbon in the mixture is about to percent. Accordingly, a preferred way of expressing the composition of this mixture is to indicate that it is comprised of a mixture of about 70 percent to 95 percent by weight of zirconium and about 5 percent to 30 percent by weight of carbon.
  • the getter material of the invention have particularly good adhesive characteristics to the material of the container as well as to itself so that no loose particles are present. Accordingly, a getter mass formed from such materials can be utilized as a relatively thick layer.
  • the getter members of the invention having such relatively thick layers of getter material have a gas capacity, which even in a cold state exceeds the gas capacity of presently known getters.
  • FIG. 1 illustrates a getter member embodiment comprised of a container 1 composed for example of molybdenum, formed into an open-ended body having an interior recess or the like.
  • a sintered mass 2 composed of a mixture of zirconium and carbon is positioned and tightly bonded to the interior recess of the container 1.
  • FIG. 2 illustrates a somewhat modified form of the getter member embodiment discussed in FIG. 1, wherein one or more molybdenum wires 3 are spotwelded onto the exterior portions of the container 1 so as to prevent the sintered mass 2 from falling out.
  • a molybdenum Z-shaped bar is spot-welded to the bottom of the interior recess of container 1 and then embedded in the zirconium-carbon mixture and sintered in with the mass 2 so as to secure the same from displacement.
  • FIG. 4 illustrates a further modified embodiment of a getter member wherein a tantalum sheet or strip 5 is crimped onto the exterior flanges of the container 1 and extends over at least a portion of the opening thereof for maintaining the mass 2 in position.
  • FIGS. 5 and 6 illustrate cylindrical getter member embodiments wherein a sheet-metal container 11, for example, formed of a high-temperature resistant material such as molybdenum or carbon, is filled with a zirconium-carbon mixture sintered into a highly porous mass 12.
  • securing means are provided.
  • such securing means comprise a bent wall portion 14 of the container 11, while in FIG. 6, the securing means comprise a wire 13 attached to the interior of container 11 and embedded within the mass 12.
  • the embodiments illustrated at FIGS. 7, 8 and 9 are comprised of a substantially open-ended carbon container 21, filled with a sintered mass 22 of a zirconiumcarbon mixture.
  • the adhesion between the carbon container 21 and the mass 22 is extremely good and very reliable during operation. Accordingly, the embodiment illustrated at FIG. 7 does not utilize any special securing means.
  • a rod 23, as of molybdenum penetrates through opposing wall portions of the container 21 and through the mass 22 to insure that the mass 22 does not become detached from the container.
  • a U-shaped member 24 is inserted and penetrates through opposed wall portions of container 21 and through mass 22 so as to secure the same from displacement.
  • a recess is formed, for example, in a thin molybdenum sheet by the application of suitable pressure.
  • the formed recess is substantially completely filled with a suitably formulated viscous zirconium-carbon mixture, as by smearing.
  • the getter member is then sintered. It is then ready for insertion into a discharge tube, even a relatively small tube.
  • discharge tubes they are heated, for example, by high frequency (HF) and the getter material is freed of gas.
  • a relatively small tube or cylinder, for example of molybdenum, of a given diameter is formed and filled with a zirconium-carbon mixture.
  • the so-filled tube is then sintered and suitably attached in a discharge tube.
  • the getter members are of relatively large dimensions, it is useful in at least certain instances to provide securing means to insure that the getter material does not separate from its container, as in the form of a zirconium-carbon plug or the like.
  • a getter member for operating at room temperature in an electric discharge tube comprised of a container having a substantially open-ended recess therein, said container being composed of a relatively hightemperature resistant material selected from the group consisting of molybdenum and carbon, and a sintered porous non-evaporable gettering mass attached within said recess, said sintered porous gettering mass being comprised of a mixture of about to percent by weight of zirconium and about 5 to 30 percent by weight of carbon.

Landscapes

  • Discharge Lamp (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US00207022A 1970-12-21 1971-12-13 Zirconium carbon getter member Expired - Lifetime US3820919A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702062992 DE2062992A1 (de) 1970-12-21 1970-12-21 Getterkörper aus einem Zirkon-Kohle-Sinterteil zum Betrieb bei Raumtemperaturen

Publications (1)

Publication Number Publication Date
US3820919A true US3820919A (en) 1974-06-28

Family

ID=5791737

Family Applications (1)

Application Number Title Priority Date Filing Date
US00207022A Expired - Lifetime US3820919A (en) 1970-12-21 1971-12-13 Zirconium carbon getter member

Country Status (9)

Country Link
US (1) US3820919A (xx)
JP (1) JPS523708B1 (xx)
CA (1) CA942372A (xx)
DE (1) DE2062992A1 (xx)
FR (1) FR2119423A5 (xx)
GB (1) GB1329628A (xx)
IT (1) IT944064B (xx)
NL (1) NL7117594A (xx)
ZA (1) ZA717523B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920355A (en) * 1974-02-28 1975-11-18 Getters Spa Gettering
US4310781A (en) * 1977-09-30 1982-01-12 Heimann Gmbh Controllable hydrogen source with gettering effect for electronic tubes
US4874339A (en) * 1985-08-09 1989-10-17 Saes Getters S.P.A. Pumping tubulation getter
US5685963A (en) * 1994-10-31 1997-11-11 Saes Pure Gas, Inc. In situ getter pump system and method
FR2771549A1 (fr) * 1996-05-29 1999-05-28 Futaba Denshi Kogyo Kk Recipient hermetique sous vide
US5911560A (en) * 1994-10-31 1999-06-15 Saes Pure Gas, Inc. Getter pump module and system
US5972183A (en) * 1994-10-31 1999-10-26 Saes Getter S.P.A Getter pump module and system
US6109880A (en) * 1994-10-31 2000-08-29 Saes Pure Gas, Inc. Getter pump module and system including focus shields
US6142742A (en) * 1994-10-31 2000-11-07 Saes Pure Gas, Inc. Getter pump module and system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4909624B2 (ja) * 2006-04-21 2012-04-04 株式会社三洋化成 まな板
US8445803B1 (en) * 2011-11-28 2013-05-21 Itron, Inc. High power electrical switching device

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920355A (en) * 1974-02-28 1975-11-18 Getters Spa Gettering
US4310781A (en) * 1977-09-30 1982-01-12 Heimann Gmbh Controllable hydrogen source with gettering effect for electronic tubes
US4874339A (en) * 1985-08-09 1989-10-17 Saes Getters S.P.A. Pumping tubulation getter
US5911560A (en) * 1994-10-31 1999-06-15 Saes Pure Gas, Inc. Getter pump module and system
US5879134A (en) * 1994-10-31 1999-03-09 Saes Pure Gas, Inc. In situ getter pump system and method
US5685963A (en) * 1994-10-31 1997-11-11 Saes Pure Gas, Inc. In situ getter pump system and method
US5972183A (en) * 1994-10-31 1999-10-26 Saes Getter S.P.A Getter pump module and system
US5980213A (en) * 1994-10-31 1999-11-09 Saes Getters S.P.A. Getter pump module and system
US5993165A (en) * 1994-10-31 1999-11-30 Saes Pure Gas, Inc. In Situ getter pump system and method
US5997255A (en) * 1994-10-31 1999-12-07 Saes Getters S.P.A. Method for pumping a chamber using an in situ getter pump
US6043137A (en) * 1994-10-31 2000-03-28 Saes Getters S.P.A. Getter pump module and system
US6109880A (en) * 1994-10-31 2000-08-29 Saes Pure Gas, Inc. Getter pump module and system including focus shields
US6142742A (en) * 1994-10-31 2000-11-07 Saes Pure Gas, Inc. Getter pump module and system
US6165328A (en) * 1994-10-31 2000-12-26 Saes Getters S.P.A. Method for processing wafers with in situ gettering
FR2771549A1 (fr) * 1996-05-29 1999-05-28 Futaba Denshi Kogyo Kk Recipient hermetique sous vide

Also Published As

Publication number Publication date
ZA717523B (en) 1972-08-30
JPS523708B1 (xx) 1977-01-29
FR2119423A5 (xx) 1972-08-04
DE2062992A1 (de) 1972-06-29
JPS4713265A (xx) 1972-07-06
GB1329628A (en) 1973-09-12
IT944064B (it) 1973-04-20
NL7117594A (xx) 1972-06-23
CA942372A (en) 1974-02-19

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