US20200024211A1 - Pyrotechnic delay composition - Google Patents

Pyrotechnic delay composition Download PDF

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Publication number
US20200024211A1
US20200024211A1 US16/243,177 US201916243177A US2020024211A1 US 20200024211 A1 US20200024211 A1 US 20200024211A1 US 201916243177 A US201916243177 A US 201916243177A US 2020024211 A1 US2020024211 A1 US 2020024211A1
Authority
US
United States
Prior art keywords
weight
delay composition
pyrotechnic delay
tungsten
aluminum
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.)
Abandoned
Application number
US16/243,177
Other languages
English (en)
Inventor
Arthur Biesse
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.)
KNDS Ammo France SA
Original Assignee
Nexter Munitions SA
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 Nexter Munitions SA filed Critical Nexter Munitions SA
Assigned to NEXTER MUNITIONS reassignment NEXTER MUNITIONS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BIESSE, Arthur
Publication of US20200024211A1 publication Critical patent/US20200024211A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B33/00—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide
    • C06B33/12—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide the material being two or more oxygen-yielding compounds
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B29/00—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate
    • C06B29/02—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate of an alkali metal
    • C06B29/04—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate of an alkali metal with an inorganic non-explosive or an inorganic non-thermic component
    • C06B29/06—Compositions containing an inorganic oxygen-halogen salt, e.g. chlorate, perchlorate of an alkali metal with an inorganic non-explosive or an inorganic non-thermic component the component being a cyanide; the component being an oxide of iron, chromium or manganese
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • C06C5/06—Fuse igniting means; Fuse connectors

Definitions

  • the technical field of the invention is that of pyrotechnic delay compositions.
  • compositions are well known. They are implemented in the form of rigid delay columns or soft cords in a metallic sheath and allow to trigger a pyrotechnic event at the end of a specified time interval.
  • They are used, for example, in the munitions field to cause self-destruction of munitions that have not reached their target. They are also used in the space field in the form of delay cords between various components of a ballistic launcher.
  • compositions combine tungsten, barium chromate and potassium perchlorate. It is also possible to incorporate ultrafine silica in these compositions, as described in patent FR 2 706 449.
  • compositions have the advantage of generating little gas and may be shaped as cords of reduced diameter (sheath diameter of less than 4 mm), without the risk of the cord bursting or the combustion being stopped.
  • this composition should be replaced by a new delay composition associating one or more iron oxides with zirconium or zirconium hydride.
  • the new composition is likely to generate hot spots in the reaction zone and, according to this patent, it is necessary to add one or more additives generating slag in order to mitigate the reaction.
  • this composition makes it possible to produce delay cords comprising a sheath based on tin and bismuth, cords whose outer diameter of the sheath is between 7.2 mm and 2.6 mm and which may, by a choice of specific formulation, ensure a burning rate of 2.64 mm/s to 4.0 mm/s.
  • the object of the invention is a pyrotechnic delay composition
  • a pyrotechnic delay composition comprising at least one oxidant and at least one reducing agent, wherein the composition is characterized in that it comprises tungsten as the first reducing agent, a first oxidant constituted by triiron tetraoxide, and a second oxidant having an oxygen content higher than that of the first oxidant.
  • Triiron tetraoxide is a well-known iron oxide found naturally in the form of ore known as magnetite. It is a non-toxic and inexpensive material. It has the disadvantage of being a relatively weak oxidant. In fact the mass of oxygen that it can release per mass of material is of the order of 28%.
  • the barium chromate of the known delay composition may release 63% of its oxygen mass.
  • the patent WO2017/084916 overcomes this disadvantage by combining the iron oxide with a strong reducing agent such as zirconium.
  • a strong reducing agent such as zirconium.
  • the reaction then leads to the production of metal remaining incandescent, while the zirconium reacts strongly with the reduced iron resulting in an intermetallic type reaction. It then becomes necessary to mitigate the combustion with slag generating materials.
  • the invention proposes to conserve tungsten as a reducing agent.
  • its reduction capacity (3.98 grams of reducing agent for one gram of oxygen) is good although lower than that of zirconium, while it also has a high thermal conductivity (174 Wm ⁇ 1 K 1 ) which allows it to dissipate calories and reduce the burning rate of the composition by draining the heat of the reaction.
  • the triiron tetraoxide is associated with a second oxidant which has an oxygen content greater than that of the triiron tetraoxide.
  • This second oxidant makes it possible to overcome the weaknesses of the triiron tetraoxide.
  • one of the following oxidants may be chosen: potassium perchlorate, barium peroxide, bismuth oxide, diodine pentoxide . . . .
  • Potassium perchlorate is preferably chosen as the second oxidant.
  • the oxygen content of potassium perchlorate is 46.2%, which is relatively high. It is therefore sufficient to reduce the amount of this oxidant to maintain a uniform combustion front.
  • composition according to the invention may comprise a second reducing agent constituted by aluminum.
  • the delay composition will therefore comprise: from 20% to 60% by weight of tungsten, and from 30% to 70% by weight of triiron tetraoxide.
  • the delay composition according to the invention will have the following composition:
  • the delay composition according to the invention will have the following composition:
  • compositions which will now be described, make it possible in a nonlimiting manner to demonstrate other advantages of the composition according to the invention.
  • the selected tungsten has a particle size of between 0.2 mm and 0.315 mm in all the compositions produced.
  • the particle size of the triiron tetraoxide is between 0.2 mm and 0.315 mm.
  • That of potassium perchlorate is between 0.2 mm and 0.315 mm.
  • That of aluminum is between 0.2 mm and 0.315 mm.
  • a first series of tests was carried out with delay compositions in the form of cords in a tin sheath.
  • the materials are dry-blended and compressed into a ductile tin metal tube of 17 mm initial outside diameter, and then the loaded tube is progressively reduced in diameter by being passed through dies to obtain a 3 mm outer diameter of the delay cord.
  • An ignition composition is then placed at the inlet of the tube that can ignite the delay composition (for example a conventional composition combining titanium and carbon).
  • compositions could also be formed into tin sheaths.
  • the combustion rates would then be higher (of the order of 3.5 mm/s to 4.5 mm/s for a tin sheath with an external diameter 3.1 mm).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Air Bags (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
US16/243,177 2018-01-17 2019-01-09 Pyrotechnic delay composition Abandoned US20200024211A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1800062 2018-01-17
FR1800062A FR3076830B1 (fr) 2018-01-17 2018-01-17 Composition retard pyrotechnique

Publications (1)

Publication Number Publication Date
US20200024211A1 true US20200024211A1 (en) 2020-01-23

Family

ID=62597570

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/243,177 Abandoned US20200024211A1 (en) 2018-01-17 2019-01-09 Pyrotechnic delay composition

Country Status (3)

Country Link
US (1) US20200024211A1 (fr)
EP (1) EP3514132B1 (fr)
FR (1) FR3076830B1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706449B1 (fr) * 1993-06-18 1995-08-11 Giat Ind Sa Composition pyrotechnique pour cordeaux retards.
BR0303546B8 (pt) * 2003-09-19 2013-02-19 tubo de choque tÉrmico.
DE102015014379A1 (de) * 2015-11-09 2017-05-11 Dynitec Gmbh Pyrotechnisches Verzögerungselement
DE102015014821A1 (de) * 2015-11-18 2017-05-18 Rheinmetall Waffe Munition Gmbh REACh konformer pyrotechnischer Verzögerungs- und Anzündsatz mit variabel einstellbaren Leistungsparametern

Also Published As

Publication number Publication date
EP3514132A1 (fr) 2019-07-24
FR3076830B1 (fr) 2022-01-28
EP3514132B1 (fr) 2023-10-04
FR3076830A1 (fr) 2019-07-19

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