EP0630876B1 - Pyrotechnische Zusammensetzung für Verzögerungsschnüre - Google Patents

Pyrotechnische Zusammensetzung für Verzögerungsschnüre Download PDF

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Publication number
EP0630876B1
EP0630876B1 EP94401341A EP94401341A EP0630876B1 EP 0630876 B1 EP0630876 B1 EP 0630876B1 EP 94401341 A EP94401341 A EP 94401341A EP 94401341 A EP94401341 A EP 94401341A EP 0630876 B1 EP0630876 B1 EP 0630876B1
Authority
EP
European Patent Office
Prior art keywords
composition
silica
pyrotechnic composition
combustion
aggregate
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
EP94401341A
Other languages
English (en)
French (fr)
Other versions
EP0630876A1 (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
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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 wants 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).
  • Patent EP332986 describes a composition combining tungsten, barium chromate, potassium perchlorate and barium hexafluorosilicate or calcium fluoride and optionally silica.
  • Patent EP25732 describes a small diameter delay cord containing a composition combining tungsten, barium chromate and potassium perchlorate. The sheath of such a cord may burst due to the release of gas during its combustion.
  • the object of the present invention is to provide a pyrotechnic composition which can be used in small diameter delay cords and which provides a low combustion speed, eliminating any risk of the sheath bursting and of combustion being stopped.
  • the subject of the invention is the application of a pyrotechnic composition consisting of a mixture of tungsten powder, barium chromate and potassium perchlorate to the production of a retardation cord with a small external diameter, in particular smaller at 4mm, cord comprising a sheath containing the pyrotechnic composition, application characterized in that the pyrotechnic composition also comprises an ultrafine silica powder, the particles of which have an average diameter of between 7 and 40 nm, according to a percentage by mass of the order from 0.5 to 1.5%, to coat the particles of powders, so as to eliminate any risk of the sheath bursting and stopping combustion.
  • the silica particles have an average diameter of 16 nm.
  • the composition may comprise a 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 can comprise a part by mass of silica to a mixture containing by mass 32% of tungsten, 58% of Barium chromate and 10% of potassium perchlorate.
  • composition according to the invention allows the production of delay cords of approximately 3.1 mm in external diameter, having at least one 90 ° bend.
  • 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 previously cited 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 nm 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)

Claims (4)

  1. Anwendung einer pyrotechnischen Zusammensetzung bestehend aus einem Gemisch aus Wolframpulver, Bariumchromat und Kaliumperchlorat zur Herstellung einer Verzögerungsschnur mit geringem Außendurchmesser, vor allem kleiner als 4 mm, wobei die Schnur einen Mantel mit der pyrotechnischen Zusammensetzung aufweist und sich die Anwendung dadurch gekennzeichnet, daß die pyrotechnische Zusammensetzung auch ein superfeines Kieselerdepulver mit einem mittleren Partikeldurchmesser zwischen 7 und 40 nm gemäß einem Masseprozentsatz in der Größenordnung von 0,5 bis 1,5 % enthält, um eine Beschichtung der Pulverpartikel durchzuführen, so daß jedes Risiko des Berstens des Mantels und des Stoppens der Verbrennung eliminiert wird.
  2. Anwendung gemäß dem Anspruch 1, gekennzeichnet dadurch, daß die Kieselerdepartikel einen mittleren Durchmesser von 16 nm aufweisen.
  3. Anwendung gemäß einem der Ansprüche 1 oder 2, gekennzeichnet dadurch, daß die pyrotechnische Zusammensetzung einen Masseanteil Kieselerde in einem Gemisch mit 33 % Masseanteil Wolfram, 60 % Masseanteil Bariumchromat und 7 % Masseanteil Kaliumperchlorat enthält.
  4. Anwendung gemäß einem der Ansprüche 1 oder 2, gekennzeichnet dadurch, daß die pyrotechnische Zusammensetzung einen Masseanteil Kieselerde in einem Gemisch mit einem Masseanteil von 32 % Wolfram, 58 % Bariumchromat und 10 % Kaliumperchlorat enthält.
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
FR9307411 1993-06-18
FR9307411A FR2706449B1 (fr) 1993-06-18 1993-06-18 Composition pyrotechnique pour cordeaux retards.

Publications (2)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2185355C2 (ru) * 2000-09-14 2002-07-20 Государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Малогазовый медленногорящий состав
FR2814462B1 (fr) 2000-09-27 2003-11-28 Giat Ind Sa Composition pyrotechnique a combustion lente
FR2816400B1 (fr) 2000-11-07 2003-04-04 Giat Ind Sa Dispositif d'amorcage de la charge explosive d'une sous-munition
RU2200141C1 (ru) * 2001-06-08 2003-03-10 Открытое акционерное общество по производству взрывчатых материалов и пиротехники "Нитро-Взрыв" Пиротехнический замедлительный состав
RU2225385C2 (ru) * 2002-02-14 2004-03-10 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Пиротехнический замедлительный состав
FR3076830B1 (fr) * 2018-01-17 2022-01-28 Nexter Munitions Composition retard pyrotechnique

Family Cites Families (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
BE383982A (de) * 1931-07-24
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
FR2464932A1 (fr) * 1979-09-06 1981-03-20 Poudres & Explosifs Ste Nale Cordeau-retard a vitesse de combustion lente et a faible diametre
DE3507399A1 (de) * 1985-03-02 1986-09-04 Diehl GmbH & Co, 8500 Nürnberg Verzoegerungssatz aus bleioxid und bor fuer zuend- und anzuendmittel
DE3808366A1 (de) * 1988-03-12 1989-10-05 Dynamit Nobel Ag Verzoegerungssaetze mit langen verzoegerungszeiten
FR2665254B1 (fr) * 1990-07-27 1992-10-16 Giat Ind Sa Systeme d'allumage pour une composition pyrotechnique.
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

Also Published As

Publication number Publication date
FR2706449B1 (fr) 1995-08-11
DE69401683T2 (de) 1997-06-05
FR2706449A1 (fr) 1994-12-23
DE69401683D1 (de) 1997-03-20
EP0630876A1 (de) 1994-12-28
ES2098878T3 (es) 1997-05-01
ATE148684T1 (de) 1997-02-15

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