EP0630876A1 - Pyrotechnische Zusammensetzung für Verzögerungsschnüre - Google Patents

Pyrotechnische Zusammensetzung für Verzögerungsschnüre Download PDF

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Publication number
EP0630876A1
EP0630876A1 EP94401341A EP94401341A EP0630876A1 EP 0630876 A1 EP0630876 A1 EP 0630876A1 EP 94401341 A EP94401341 A EP 94401341A EP 94401341 A EP94401341 A EP 94401341A EP 0630876 A1 EP0630876 A1 EP 0630876A1
Authority
EP
European Patent Office
Prior art keywords
composition
silica
pyrotechnic composition
mass
combustion
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.)
Granted
Application number
EP94401341A
Other languages
English (en)
French (fr)
Other versions
EP0630876B1 (de
Inventor
André Espagnacq
Philippe Morand
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.)
Giat Industries SA
Original Assignee
Giat Industries 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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP0630876A1 publication Critical patent/EP0630876A1/de
Application granted granted Critical
Publication of EP0630876B1 publication Critical patent/EP0630876B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/18—Compositions or products which are defined by structure or arrangement of component of product comprising a coated component
    • C06B45/30—Compositions or products which are defined by structure or arrangement of component of product comprising a coated component the component base containing an inorganic explosive or an inorganic thermic component
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
    • C06B23/009—Wetting agents, hydrophobing agents, dehydrating agents, antistatic additives, viscosity improvers, antiagglomerating agents, grinding agents and other additives for working up
    • 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 present invention relates to a pyrotechnic composition intended for the manufacture of pyrotechnic delays and, more particularly, delay cords.
  • Pyrotechnic delays are well known to those skilled in the art and delays have already been proposed comprising tungsten powder, barium chromate, potassium perchlorate and silica (diatomaceous earth). The role of the latter is to slow down combustion, by capturing calories, and to favor the coating of different grains.
  • US Pat. No. 4,144,814 describes a composition of this type which can be used in the form of a compressed tablet containing 5% by mass of silica. This composition can be advantageous to use when it is a detonator into which one wishes to introduce a certain delay by interposing a compressed tablet as is the case of the aforementioned patent, but is not suitable when it is a delay line.
  • a delay cord consists of a sheath of small diameter (less than 4 mm) inside which is placed the pyrotechnic composition having one or more elbows.
  • the compositions described above although called compositions without generation of gas, still produce a slight clearance during combustion which, due to the small diameter of the cord, can only dissipate towards the outside of the sheath after bursting of the latter.
  • the risk of bursting is further accentuated in the zones of least resistance of the sheath such as bends and generally causes the combustion to stop.
  • This composition is also not suitable when a very low combustion speed (less than 2.5 mm / s) is sought, especially when used at very low temperatures (- 50 ° C).
  • the object of the present invention is to provide a pyrotechnic composition which can be used in small diameter delay cords and which provide a low combustion speed, eliminating any risk of bursting of the sheath and stopping of combustion.
  • the subject of the invention is a pyrotechnic composition intended for producing delay cords, of the type consisting of a mixture of tungsten powders, barium chromate and potassium perchlorate, characterized in that it contains a silica powder.
  • ultrafine the particles of which have an average diameter of between 7 and 40 millimicrons, according to a percentage by mass of the order of 0.5 to 1.5%, in order to coat the particles of the powders.
  • the silica particles have an average diameter of 16 millimicrons.
  • the composition may comprise 1 part by mass of silica to a mixture containing by mass 33% of tungsten, 60% of barium chromate and 7% of potassium perchlorate.
  • the composition may comprise 1 part by mass of silica to a mixture containing by mass 32% of tungsten, 58% barium chromate and 10% potassium perchlorate.
  • composition according to the invention can be applied to the production of delay cords of approximately 3.1 mm in external diameter, having at least one 90 ° bend.
  • An advantage of the present invention lies in the absence of rupture of the sheath of the cord, whatever the conditions of use.
  • Another advantage lies in the conservation of the delay properties in a temperature range ranging from - 50 ° C to + 60 ° C, and for extremely low combustion rates of the order of 2 to 2.5 mm / s.
  • the composition according to the invention comprises the same constituents as the delay composition described in the aforementioned patent. These are tungsten powder, potassium perchlorate, barium chromate and silica. However, to obtain the results of the invention, an ultrafine silica must be used, the particles of which have an average size of 7 to 40 millimicrons and according to a percentage by mass ranging from 0.5 to 1.5% of the total composition.
  • the silica thus used plays the role of a coating material for the other components, which leads to a reduction in internal confinement of the composition by a reduction in its density. It is under these conditions that the particularly surprising results are achieved.
  • the coating technique is known in itself and is carried out in a conventional manner. It is carried out by dry process for example in a mixer sold under the commercial designation "TURBULA”.
  • This table shows the negligible influence of ultrafine silica on the pyrotechnic performances of the pyrotechnic compositions B and D according to the invention.
  • composition E which has a conventionally used binder, are very poor. All the cords burst with combustion stopped.
  • composition F which has a conventional binder, show a high percentage of bursts, combustion stoppages, and a relatively high combustion rate.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Air Bags (AREA)
  • Pulse Circuits (AREA)
EP94401341A 1993-06-18 1994-06-16 Pyrotechnische Zusammensetzung für Verzögerungsschnüre Expired - Lifetime EP0630876B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9307411A FR2706449B1 (fr) 1993-06-18 1993-06-18 Composition pyrotechnique pour cordeaux retards.
FR9307411 1993-06-18

Publications (2)

Publication Number Publication Date
EP0630876A1 true EP0630876A1 (de) 1994-12-28
EP0630876B1 EP0630876B1 (de) 1997-02-05

Family

ID=9448310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401341A Expired - Lifetime EP0630876B1 (de) 1993-06-18 1994-06-16 Pyrotechnische Zusammensetzung für Verzögerungsschnüre

Country Status (5)

Country Link
EP (1) EP0630876B1 (de)
AT (1) ATE148684T1 (de)
DE (1) DE69401683T2 (de)
ES (1) ES2098878T3 (de)
FR (1) FR2706449B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2814462A1 (fr) * 2000-09-27 2002-03-29 Giat Ind Sa Composition pyrotechnique a combustion lente

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2816400B1 (fr) 2000-11-07 2003-04-04 Giat Ind Sa Dispositif d'amorcage de la charge explosive d'une sous-munition
FR3076830B1 (fr) * 2018-01-17 2022-01-28 Nexter Munitions Composition retard pyrotechnique

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR617285A (fr) * 1925-10-23 1927-02-16 Procédé pour améliorer les explosifs à base de corps hygroscopiques
FR735745A (fr) * 1931-07-24 1932-11-14 Procédé de préparation de masses initiantes à base d'azotures de métaux lourds ou de fulminates
US3028229A (en) * 1958-08-27 1962-04-03 Universal Match Corp Pyrotechnic compositions
US3701697A (en) * 1971-05-27 1972-10-31 Us Navy Pressure compensated pyrotechnic time delay composition
EP0025732A2 (de) * 1979-09-06 1981-03-25 Societe Nationale Des Poudres Et Explosifs Verzögerungsschnur mit einer langsamen Brenngeschwindigkeit und einem schmalen Durchmesser
DE3507399A1 (de) * 1985-03-02 1986-09-04 Diehl GmbH & Co, 8500 Nürnberg Verzoegerungssatz aus bleioxid und bor fuer zuend- und anzuendmittel
EP0332986A1 (de) * 1988-03-12 1989-09-20 Dynamit Nobel Aktiengesellschaft Verzögerungssätze mit langen Verzögerungszeiten
EP0468838A1 (de) * 1990-07-27 1992-01-29 Giat Industries Societe Anonyme Zündsystem für eine pyrotechnische Zusammensetzung
DE4126016C1 (en) * 1991-08-06 1992-11-12 Dynamit Nobel Ag, 5210 Troisdorf, De Non-moisture sensitive, artificial camouflaging mixt. - comprises metal dust solid particles e.g. of iron@ surrounded by hydrophobic silica gel

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR617285A (fr) * 1925-10-23 1927-02-16 Procédé pour améliorer les explosifs à base de corps hygroscopiques
FR735745A (fr) * 1931-07-24 1932-11-14 Procédé de préparation de masses initiantes à base d'azotures de métaux lourds ou de fulminates
US3028229A (en) * 1958-08-27 1962-04-03 Universal Match Corp Pyrotechnic compositions
US3701697A (en) * 1971-05-27 1972-10-31 Us Navy Pressure compensated pyrotechnic time delay composition
EP0025732A2 (de) * 1979-09-06 1981-03-25 Societe Nationale Des Poudres Et Explosifs Verzögerungsschnur mit einer langsamen Brenngeschwindigkeit und einem schmalen Durchmesser
DE3507399A1 (de) * 1985-03-02 1986-09-04 Diehl GmbH & Co, 8500 Nürnberg Verzoegerungssatz aus bleioxid und bor fuer zuend- und anzuendmittel
EP0332986A1 (de) * 1988-03-12 1989-09-20 Dynamit Nobel Aktiengesellschaft Verzögerungssätze mit langen Verzögerungszeiten
EP0468838A1 (de) * 1990-07-27 1992-01-29 Giat Industries Societe Anonyme Zündsystem für eine pyrotechnische Zusammensetzung
DE4126016C1 (en) * 1991-08-06 1992-11-12 Dynamit Nobel Ag, 5210 Troisdorf, De Non-moisture sensitive, artificial camouflaging mixt. - comprises metal dust solid particles e.g. of iron@ surrounded by hydrophobic silica gel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
B. ELVERS ET AL.: "Ullmann's Encyclopedia of Industrial Chemistry, Tome A23, Seite 636 - 641", 1993, VCH, WEINHEIM, DE *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2814462A1 (fr) * 2000-09-27 2002-03-29 Giat Ind Sa Composition pyrotechnique a combustion lente
WO2002026662A1 (fr) * 2000-09-27 2002-04-04 Giat Industries Composition pyrotechnique a combustion lente
US6723191B2 (en) 2000-09-27 2004-04-20 Giat Industries Slow combustion pyrotechnic composition

Also Published As

Publication number Publication date
DE69401683T2 (de) 1997-06-05
ES2098878T3 (es) 1997-05-01
ATE148684T1 (de) 1997-02-15
FR2706449B1 (fr) 1995-08-11
EP0630876B1 (de) 1997-02-05
DE69401683D1 (de) 1997-03-20
FR2706449A1 (fr) 1994-12-23

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