US2988665A - Coated contact members for electric discharge tubes - Google Patents

Coated contact members for electric discharge tubes Download PDF

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Publication number
US2988665A
US2988665A US698720A US69872057A US2988665A US 2988665 A US2988665 A US 2988665A US 698720 A US698720 A US 698720A US 69872057 A US69872057 A US 69872057A US 2988665 A US2988665 A US 2988665A
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US
United States
Prior art keywords
layer
gold
cobalt
pins
electric discharge
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
US698720A
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English (en)
Inventor
Duran Johannes Christiaan
Bakker Martinus Antonius Maria
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
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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 US2988665A publication Critical patent/US2988665A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/04—Joining glass to metal by means of an interlayer
    • C03C27/042—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts
    • C03C27/046—Joining glass to metal by means of an interlayer consisting of a combination of materials selected from glass, glass-ceramic or ceramic material with metals, metal oxides or metal salts of metals, metal oxides or metal salts only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/42—Coating with noble metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49224—Contact or terminal manufacturing with coating

Definitions

  • This invention relates to coated contact members for an electric discharge tube and to a method of providing such coatings.
  • contact pins of electric discharge tubes it is necessary for contact pins of electric discharge tubes to be coated with a thin layer of gold before being sealed into the base of the tube, so that not only is a permanent reliable contact afforded with the receiving contact members of a tube holder, but, also, the high-frequency resistance of the pins is considerably reduced.
  • the gold'layer it is essential that the gold'layer be wholly intact at least on the contact, members themselves after the pins have been sealed into the base of thetube.
  • a popular technique often employed is the so-called drum method, in which the objectsv to "be coated are.
  • An intermediate layer may be employed to avoid diffusion of the gold into the metal of the substratum.
  • such an intermediate layer must not only avoid diffusion in two directions, but, also,
  • the intermediate layer must not be chemically attacked by the cyanide alkaline solution before the gold has deposited thereon. Still further, the intermediate layer must not give off gas when the pins are heated during the sealing into glass, otherwise, a vacuum-tight joint could not be effected.
  • an intermediate layer containing cobalt between the outer gold layer and the contact member is particularly suitable for this purpose.
  • An intermediate layer which consists of pure cobalt, or of an alloy of cobalt with iron and/0r nickel, such as fernico, is particularly suitable for this purpose.
  • the use of such a cobalt-containing intermediate layer not only prevents diffusion of the gold into the intermediate layer, or conversely, but also insures highly satisfactory adherence of the gold layer.
  • both the gold layer and the intermediate layer may be provided by use of the drum ice.
  • cobalt-containing layers which are suitable are cobalt-iron; cobalt-nickel or cobalt-manganese layers.
  • the proportions of the cobalt in a cobalt alloy should preferably be at least 20%, better results being attained as the quantity of cobalt is increased.
  • the contact members themselves are preferably constituted of chromeiron.
  • chrome-iron is meant an alloy of chromium and iron containing between ,10% to 35% of chromium.
  • iron alloys of nickel-iron with copper and/ or chromium, cobalt or manganese; and further tungsten.
  • FIG. 1 shows a tube containing contact pins according to the invention
  • FIG. 2 shows one embodiment of a contact member according to 'the invention.
  • FIG. 3 shows a diagram of the process.
  • an envelope 1 of an electric discharge tube is closed by a glass base 2. Sealed into the base 2 are a plurality of chrome-iron contact pins 3, of which at leas't'the portions projecting externally from the tube 1 are coated with a gold layer 5 having a thickness of less than a micron.
  • a layer 4 consisting of fernico material, i.e. an alloy of cobalt-iron-nickel containing about 28% nickel and 18% cobalt is provided between the gold layer 5 and the conductor 3. If the gold layer 5 must also serve to afford satisfactory high-frequency conduction, a greater thickness, for example, 2 microns or upwards, may be used. A layer of such thickness keeps intact even within the seal and the tube.
  • the whole pin is coated with an intermediate layer and a gold layer
  • the gold layer if it is of great thinness, might have a tendency to be interrupted wholly or in part at the sealing area as a result of the difiusion which still occurs at the high temperature during sealing.
  • such thin gold layers are provided mainly for obtaining a highly satisfactory and reliable contact between the pin and the contact spring of a tube holder, and need therefore be provided only on the part of the pins projecting from the tube.
  • FIG. 2 shows a so-called triple sealing pin which is very common in the field consisting of a lower core 8 of nickel, iron, nickel-iron, chrome-iron or similar material.
  • the central core 7 consists of copper-clad wire and the upper core 6 of iron, molybdenum or a metal similar to that of the core 8.
  • the whole of this pin is coated with a cobalt-containing intermediate layer 4 at least 5 microns in thickness, and preferably 10 to 12 microns in thickness and on top thereof a gold layer 5 of, for example, 0.5 micron thick.
  • the pins in the drum are suffused with an alkaline cyanide-bath for plating out a gold layer using a current of 4 amps. during 2 /2 hours. Since the chrome-iron core of the pins is protected from the alkaline bath by the intermediate layer, the chromeiron is not chemically attacked. It has been found that the drum method thus yields highly satisfactory results.
  • the cobalt-containing intermediate layer adheres very well both to the core and the gold layer, and does not give off any appreciable amount of gas during sealing in of the pins in the tube. After a rinse with water the pins can be stored.
  • substantially pure cobalt as it appears in the claims shall be understood to mean cobalt of such purity that dififusion between the outer layer and the core is prevented.
  • An electric discharge tube comprising an envelope and at least one contact member sealed therein, said member consisting essentially of a base of a metal selected from the group consisting of nickel, iron, chromium and alloys thereof, an outer layer thereover of a metal selected from the group consisting of copper, gold, and silver, and a layer intermediate said base and said outer layer, said intermediate layer consisting of substantially pure cobalt about 10 microns in thickness.
  • An electric discharge tube comprising an envelope and at least one contact member sealed therein, said member consisting essentially of a base metal selected from the group consisting of nickel, iron, chromium, and alloys thereof, an outer layer of gold thereover, and a layer intermediate said base and said gold layer, said intermediate layer consisting of substantially pure cobalt about 10 microns in thickness.
  • An electric discharge tube comprising an envelope and at least one contact member sealed therein, said member consisting essentially of a base metal selected from the group consisting of nickel, iron, chromium, and alloys thereof, an outer layer thereover having a thickness of less than about one micron and consisting of gold, and a layer intermediate said gold layer and said base, said intermediate layer consisting of substantially pure cobalt about 10 microns in thickness.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Electrochemistry (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Laminated Bodies (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US698720A 1952-12-05 1957-11-25 Coated contact members for electric discharge tubes Expired - Lifetime US2988665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL317668X 1952-12-05

Publications (1)

Publication Number Publication Date
US2988665A true US2988665A (en) 1961-06-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US698720A Expired - Lifetime US2988665A (en) 1952-12-05 1957-11-25 Coated contact members for electric discharge tubes

Country Status (7)

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US (1) US2988665A (en(2012))
BE (1) BE524826A (en(2012))
CH (1) CH317668A (en(2012))
DE (1) DE963013C (en(2012))
FR (1) FR1089039A (en(2012))
GB (1) GB731588A (en(2012))
NL (2) NL174361B (en(2012))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3525066A (en) * 1968-01-12 1970-08-18 Ibm Electrical contact pins and method of making same
US3927841A (en) * 1974-05-09 1975-12-23 Flight Connector Corp Contact
US20150037985A1 (en) * 2013-07-30 2015-02-05 Hon Hai Precision Industry Co., Ltd. Low profile electrical connector
US9741461B2 (en) 2015-04-09 2017-08-22 Il Metronic Sensortechnik Gmbh Contact pins for glass seals and methods for their production

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1108816B (de) * 1959-04-03 1961-06-15 Siemens Ag Mit duennem Goldueberzug versehene Metallteile von elektrischen Entladungs-gefaessen
DE1100182B (de) * 1959-09-08 1961-02-23 Iapatelholdia Patentverwertung Nicht emittierende Elektrode fuer elektrische Entladungsgefaesse und Verfahren zu ihrer Herstellung
DE1174912B (de) * 1962-01-09 1964-07-30 Bosch Gmbh Robert Verfahren zum Behandeln von Einschmelz-draehten fuer Elektronenroehren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US58037A (en) * 1866-09-11 Improvement in coating iron and steel with gold, silver
US2284151A (en) * 1939-04-25 1942-05-26 Hygrade Sylvania Corp Unitary stem and contact base for electron tubes and the like
US2300558A (en) * 1940-07-22 1942-11-03 Fansteel Metallurgical Corp Contact alloys
CH238227A (de) * 1943-07-12 1945-06-30 Duerrwaechter Eugen Ing Dr Kontaktkörper für elektrotechnische Zwecke.
US2429222A (en) * 1943-06-05 1947-10-21 Bell Telephone Labor Inc Method of making contact wires
US2819207A (en) * 1953-06-22 1958-01-07 Republic Steel Corp Process for enameling steel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE738827C (de) * 1939-02-28 1943-09-10 Telefunken Gmbh Glas-Metalleinschmelzung fuer Vakuumroehren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US58037A (en) * 1866-09-11 Improvement in coating iron and steel with gold, silver
US2284151A (en) * 1939-04-25 1942-05-26 Hygrade Sylvania Corp Unitary stem and contact base for electron tubes and the like
US2300558A (en) * 1940-07-22 1942-11-03 Fansteel Metallurgical Corp Contact alloys
US2429222A (en) * 1943-06-05 1947-10-21 Bell Telephone Labor Inc Method of making contact wires
CH238227A (de) * 1943-07-12 1945-06-30 Duerrwaechter Eugen Ing Dr Kontaktkörper für elektrotechnische Zwecke.
US2819207A (en) * 1953-06-22 1958-01-07 Republic Steel Corp Process for enameling steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3525066A (en) * 1968-01-12 1970-08-18 Ibm Electrical contact pins and method of making same
US3927841A (en) * 1974-05-09 1975-12-23 Flight Connector Corp Contact
US20150037985A1 (en) * 2013-07-30 2015-02-05 Hon Hai Precision Industry Co., Ltd. Low profile electrical connector
US9356368B2 (en) * 2013-07-30 2016-05-31 Hon Hai Precision Industry Co., Ltd. Low profile electrical connector
US9741461B2 (en) 2015-04-09 2017-08-22 Il Metronic Sensortechnik Gmbh Contact pins for glass seals and methods for their production

Also Published As

Publication number Publication date
NL87131C (en(2012))
DE963013C (de) 1957-05-02
CH317668A (de) 1956-11-30
BE524826A (en(2012))
FR1089039A (fr) 1955-03-14
GB731588A (en) 1955-06-08
NL174361B (nl)

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