US2078609A - Reaction product of gallic acid and a soluble tungsten compound and a process of making it - Google Patents

Reaction product of gallic acid and a soluble tungsten compound and a process of making it Download PDF

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Publication number
US2078609A
US2078609A US699430A US69943033A US2078609A US 2078609 A US2078609 A US 2078609A US 699430 A US699430 A US 699430A US 69943033 A US69943033 A US 69943033A US 2078609 A US2078609 A US 2078609A
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United States
Prior art keywords
tungsten
gallic acid
compound
reaction product
compounds
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Expired - Lifetime
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US699430A
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English (en)
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Pacz Aladar
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Individual
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/02—Manufacture of incandescent bodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F11/00—Compounds containing elements of Groups 6 or 16 of the Periodic Table
    • C07F11/005—Compounds containing elements of Groups 6 or 16 of the Periodic Table compounds without a metal-carbon linkage

Definitions

  • the presentinvention deals with the manufacture of highly plastic tungsten compounds from which wires for electric illuminating purposes can be. produced in a particularly advantageous way,
  • the plastic tungsten. compounds made according to the invention are particularly suitable for the manufacture of wires in the presence of large quantities of second class conductors with high electron emissivity, such as thorium oxide and the like. r i
  • tungsten compounds which have a certain plasticity.
  • a method has been described in my United States Patent No. 1,071,568 for producing tungsten compounds of the mentioned type by precipitation of organic tungsten 20 compounds from solutions of ammonium tungstate and gallic acid by means of sulphuric acid.
  • the tungsten compounds precipitated according to this method and particularly by means of the concentrations of the solutions indicated in this patent, have a certain plasticity sufficient for the production of wires.
  • the plasticity is not sufilcient to make it possible to add, for instance, finely pulverized materials in reasonable quantities.
  • ammonium tungstate it is also possible to use other soluble compounds of tungstic acid, although the ammonium tungstate has proved to be the most suitable because of the high 7 volatility'of the ammonium radical.
  • concentration of the gallic acid solution may also be changed within narrow limits as long as the ratio between the gallic acid and the tungstate remains the same.
  • the organic tungsten compound obtained in this manner can be used for the manufacture of a large number of tungsten products.
  • tungsten wires for illuminating purposes can be made by mixing finely pulverized tungsten with a suitable quantity of the organic tungsten compound, which was obtained according to the invention and which has a considerably higher plasticity than the known tungsten compounds.
  • Even when rather large amounts of tungsten powder are added (more than 100 grams can be used in connection with the above mentioned quantities) a mass is obtained which is so plastic that it can be formed into fine wires without difficulties, and even at low pressure through the ordinary metal nozzles or glass nozzles. It is not only possible to make wires with this compound but it is also possible to produce bars that are hammered and drawn, or even tubes or hollow bars.
  • molybdenum, tantalum, thorium or the like may be added.
  • the produced wires, bars or tubes are sintered in the customary manner in an inert atmosphere or in hydrogen by means of an electric current.
  • organic tungsten compound or compounds produced in this manner are also suitable for the manufacture of hard metals; in this case,
  • the binding medium adds simultaneously tungsten and an in creased percentage of carbon so that carbonization will take place at the same time as the sintering.
  • a possible method of procedure in this .case is to mix the binding medium with the individual components of the hard metal to be produced, consequently to mix it with metallic tungsten, carbon in the form of soot, and with an auxiliary metal with a low melting point, such as cobalt or other metals of the iron group.
  • the mixture is-then subjected to heat, on the one hand in order to decompose the organic tungsten compound, and on the other hand to liberate the tungsten introduced by the compound in the finest possible division.
  • the tungsten compound produced according to the invention has a very high binding capacity for the added pulverized metals and as both the tungsten in the finest division and also the carbon are liberated when this compound is decomposed, while the other components of the compound escape in the volatile state.
  • organic tungsten compounds may be mixed with carbon not only in the form of soot or finely divided carbon but carbon in other forms, such as activated carbon. The mixture may then be subjected to heat and will yield activated carbon with improved properties.
  • the method of producing a binder for pulverulent materials having a relatively high plasticity and binding capacity which comprises forming a reaction product from substantially equal amounts of gallic acid and a soluble tungstate salt, whereby a highly plastic,organic, tungsten product is produced, which has the property of causing a relatively large quantity of finely divided metallic substances to be highly plastic.
  • the method of producing a highly plastic reaction product which comprises converting soluble tungstic acid compounds and gallic acid, in which the ratio of the gallic acid to the soluble tungstic acid compounds is at least 1:2, into a reaction product and completing the precipitation of the reaction product with the addition of a relatively small amount of mineral acid, whereby highly plastic tungsten compounds are produced, which are capable of combining with relatively large amounts of finely divided substances to form a plastic mixture which can be readily shaped at low pressures.
  • a highly plastic reaction product of gallic acid and asoluble tungstate compound in a proportion of gallic acid in excess of one part gallic acid to two parts tungstate compound said product being highly plastic and having the property of acting as a binder for a relatively large quantity of finely divided substances, and rendering the mixture sufliciently plastic so that it can be readily shaped at low pressures.
  • a highly plastic reaction product of gallic acid and a soluble tungstate compound in substantially. equal proportions of gallic acid and tungstate compound said product being highly plastic and having the property of acting as a binder for a relatively large quantity of finely divided metallic and non-metallic substances.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
US699430A 1932-11-24 1933-11-23 Reaction product of gallic acid and a soluble tungsten compound and a process of making it Expired - Lifetime US2078609A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2078609X 1932-11-24

Publications (1)

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US2078609A true US2078609A (en) 1937-04-27

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US699430A Expired - Lifetime US2078609A (en) 1932-11-24 1933-11-23 Reaction product of gallic acid and a soluble tungsten compound and a process of making it

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US (1) US2078609A (xx)
NL (1) NL38093C (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444849A (en) * 1946-01-11 1948-07-06 Alfred F Reilly Flint
US4562276A (en) * 1982-11-10 1985-12-31 Montedison S.P.A. Peroxide composition based on tungsten and phosphorus or arsenic and processes and uses relative thereto

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444849A (en) * 1946-01-11 1948-07-06 Alfred F Reilly Flint
US4562276A (en) * 1982-11-10 1985-12-31 Montedison S.P.A. Peroxide composition based on tungsten and phosphorus or arsenic and processes and uses relative thereto

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Publication number Publication date
NL38093C (xx)

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