US3260356A - Getter container - Google Patents

Getter container Download PDF

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Publication number
US3260356A
US3260356A US325296A US32529663A US3260356A US 3260356 A US3260356 A US 3260356A US 325296 A US325296 A US 325296A US 32529663 A US32529663 A US 32529663A US 3260356 A US3260356 A US 3260356A
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US
United States
Prior art keywords
getter
metal
envelope
foil
apertured
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
US325296A
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English (en)
Inventor
Garbe Siegfried
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3260356A publication Critical patent/US3260356A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01J7/186—Getter supports
    • 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

  • the invention relates to a getter arrangement for or in vacuum vessels, especially electron tubes, which is enclosed in an envelope to prevent the absorption of gas from the vacuum vessel.
  • protective envelope is used herein to denote not only the closed but also the opened protective envelope in the finished vacuum vessel.
  • barium or a barium alloy within a closed container, part of the wall of the container consisting of a readily fusible foil of a metal such as, for example, magnesium or aluminium. Before activation the foil is opened by melting.
  • Such a foil cannot be used with non-vaporizing getters consisting of a finely powdered supply of large specific surface of a getter metal, which may be mixed with a metal preventing the tendency to sinter together, since the melting metal of the foil would penetrate into the powder, which in the non-activated state consists of the hydride of the getter metal, so that the getter would be poisoned.
  • such non-vaporizing getters are heated during the tiring and degassing process to a temperature of 300 C. or even to a higher temperature for a prolonged period of time. Consequently the greater part of the getter is already activated, so that due to its high pumping rate the getter is likely to absorb such an amount of the gases evolved that very little of the capacity of the getter is left and that on repeated activation the gases expelled may have a detrimental influence upon sensitive electrodes or particular layers.
  • getters consisting of a more or less compact mass of a non-vaporizing getter metal a protective metal foil cannot always be used since removal of the foil by melting may give rise to undesirable alloying.
  • the protective envelope in a getter arrangement for or in vacuum vessels, especially electron tubes, which is enclosed in an envelope to prevent the absorption of gas from the vacuum vessel, the protective envelope consists of two apertured metal layers with an interposed -foil of a metal having 4a melting point lower than that of the apertured layers.
  • the getter After firing and degassing of the vessel the getter is activated by heating the envelope externally which results in the metal foil being melted.
  • the melted metal foil Wets firstly the outer apertured metal layer and subsequently the inner apertured metal layer with the result that the melted metal is prevented from wetting the getter arrangement.
  • the apertured metal layers preferably have such a composition, at least supercially, that they are capable of alloying with the metal of the foil.
  • the only suitable material for the foil is aluminum, while for the apertured layers a choice may be made between copper-nickel alloy, nickel-plated copper nickel or nickelplated iron.
  • iiattened gauze may be used for the apertured metal layers
  • the most suitable material is what is known as expanded metal, since in this case the protective envelope after being opened by melting readily provides access to gases and furthermore may readily be made up from several parts by welding. Under certain circumstances part of the protective envelope may consist of non-apertured material.
  • a getter arrangement in accordance with the invention may contain within the protective envelope a non-activated non-vaporizing getter; however, alternatively there may be enclosed in the protective envelope a non-Vaporizing getter on the basis, for example, of hydride, which is activated completely or for the greater .part ⁇
  • the protective envelope of the getter arrangement exerts a favourable influence upon the degassing process, since in the case of desorption of previously physically absorbed gases, for example water vapor, which may be produced by heating the still unactivated getter, this envelope prevents these gases from being liberated into the vacuum vessel. Owing to the large specific surface of the getter these amounts of gas may be far greater than the amounts liberated from the smaller surface of the vacuum vessel to be evacuated. When the vacuum vessel is cleaned by firing, these gases remain contained in the protective envelope and are again absorbed by the getter, which in the firing process at 300 C. is already partly activated, as long as the protective envelope is closed.
  • FIG. 1 is a sectional View -of a getter arrangement with a closed protective envelope
  • FIG. 2 shows part of an opened protective envelope.
  • a supply of powder 1 comprises 500 mgs. of grains having a mean diameter of 300 microns.
  • T-he grains consist of a mixture of about equal parts by weight of zirconium hydride and powdered tungsten having a powder diameter of from l to 2 microns only. The larger grains are obtained by granulating a larger moulding pressed under low pressure from the line powder.
  • the supply of lpowder 1 is accommodated in wire netting 2 of stainless steel from wires 30 microns thick with interstices of 30 microns.
  • the bag 2 is annular, 8 mms. high, has a mean diameter of 16 rnms. and a thickness of 3 mms.
  • the inner and outer layers 3 and 4 of the protective envelope are made of expanded copper nickel sheet having a thickness of 0.1 mm., an aluminium foil 5 having a thickness of 50 microns being sandwiched between them.
  • the halves are welded to one another along their annular rims with the aid of copper nickel tapes 9 and 10.
  • the arrangement is supported by two supports 8 of copper nickel tape having a thickness of 0.5 mm.
  • the apertures in the layers 3 and 4 of expanded metal are denoted by 6 and 7.
  • FIG. 2 shows part of the protective envelope on an enlarged scale.
  • a getter device for a vacuum vessel comprising a sealed envelope containing a getter material, said envelope comprising two apertured metal layers separated by an imperforate foil of a metal having a lower melting point than that of the metal of the ⁇ apertured metal layers.
  • a getter device ⁇ for a vacuum vessel comprising a sealed envelope containing a getter material, said enve lope comprising two apertured metal layers separated by an imperforate rfoil of a metal having a lower melting point than that of the metal of the apertured metal layers, at least the surfaces of said apertured metal layers having a composition which forms an alloy upon heating with said foil.
  • a getter device for a vacuum vessel comprising a sealed envelope containing a getter material, said envelope comprising t-wo apertured nickel-containing metal layers separated by an imperforate aluminum foil having a lower melting point than that of the metal of the apertured metal layers.
  • a getter device for a vacuum vessel comprising a sealed envelope containing a getter material, said envelope comprising two apertured layers of expanded metal separated by an imperforatefoil of a metal having a lower melting point than that of the metal of the apertured metal layers.
  • a getter device for a vacuum vessel comprising a sealed envelope containing an activated getter material, said envelope comprising two apertured metal layers separated by an imperforate foil of a metal having a lower melting point than that of the metal of the apertured metal layers.
  • a getter device for a vacuum vessel comprising a sealed envelope containing a non-activated getter material, said envelope comprising t-wo apertured metal layers separated by an imperforate foil of a metal having a lower melting point than that of the metal of the apertured metal layers.
  • a getter -device rfor a vacuum vessel comprising a sealed envelope containing a getter material, said envelope comprising two apertured metal layers separated by a foil of an imperforate metal having a lower melting point than that of the metal of the apertured metal layers, said envelope opening upon heating by melting of the foil which t'iorms a residue -at the edges of the apertures.

Landscapes

  • Thermally Insulated Containers For Foods (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US325296A 1962-12-07 1963-11-21 Getter container Expired - Lifetime US3260356A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN22452A DE1170561B (de) 1962-12-07 1962-12-07 Gasbinderanordnung fuer bzw. in Vakuumgefaessen, insbesondere fuer oder in Elektroenroehren

Publications (1)

Publication Number Publication Date
US3260356A true US3260356A (en) 1966-07-12

Family

ID=7342154

Family Applications (1)

Application Number Title Priority Date Filing Date
US325296A Expired - Lifetime US3260356A (en) 1962-12-07 1963-11-21 Getter container

Country Status (5)

Country Link
US (1) US3260356A (enrdf_load_html_response)
CH (1) CH416851A (enrdf_load_html_response)
DE (1) DE1170561B (enrdf_load_html_response)
GB (1) GB1008486A (enrdf_load_html_response)
NL (2) NL143365B (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272259A (en) * 1976-07-21 1981-06-09 Union Carbide Corporation Gas gettering system
US5191980A (en) * 1991-04-16 1993-03-09 Saes Getters Spa Protective vessel for a getter material
US11401211B2 (en) * 2017-06-30 2022-08-02 Panasonic Intellectual Property Management Co., Ltd. Method for manufacturing gas adsorption unit, method for manufacturing glass panel unit and method for manufacturing building component

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3600298A1 (de) * 1985-03-07 1986-09-11 Messer Griesheim Gmbh, 6000 Frankfurt Verfahren zum einbringen eines adsorptionsmittels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2100746A (en) * 1935-11-07 1937-11-30 Rca Corp Gettering vacuum tube
US2336138A (en) * 1941-07-24 1943-12-07 Hartford Nat Bank & Trust Co Vaporization of metals
US2528547A (en) * 1945-08-03 1950-11-07 Gerard J Reilly Hydrogen thyratron
US2855534A (en) * 1953-04-24 1958-10-07 Philips Corp Getter holder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2100746A (en) * 1935-11-07 1937-11-30 Rca Corp Gettering vacuum tube
US2336138A (en) * 1941-07-24 1943-12-07 Hartford Nat Bank & Trust Co Vaporization of metals
US2528547A (en) * 1945-08-03 1950-11-07 Gerard J Reilly Hydrogen thyratron
US2855534A (en) * 1953-04-24 1958-10-07 Philips Corp Getter holder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4272259A (en) * 1976-07-21 1981-06-09 Union Carbide Corporation Gas gettering system
US5191980A (en) * 1991-04-16 1993-03-09 Saes Getters Spa Protective vessel for a getter material
US11401211B2 (en) * 2017-06-30 2022-08-02 Panasonic Intellectual Property Management Co., Ltd. Method for manufacturing gas adsorption unit, method for manufacturing glass panel unit and method for manufacturing building component

Also Published As

Publication number Publication date
CH416851A (de) 1966-07-15
NL143365B (nl) 1974-09-16
NL301245A (enrdf_load_html_response)
GB1008486A (en) 1965-10-27
DE1170561B (de) 1964-05-21

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