EP3514132B1 - Pyrotechnical delay composition - Google Patents

Pyrotechnical delay composition Download PDF

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Publication number
EP3514132B1
EP3514132B1 EP19151002.3A EP19151002A EP3514132B1 EP 3514132 B1 EP3514132 B1 EP 3514132B1 EP 19151002 A EP19151002 A EP 19151002A EP 3514132 B1 EP3514132 B1 EP 3514132B1
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weight
tungsten
aluminum
potassium perchlorate
composition according
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German (de)
French (fr)
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EP3514132A1 (en
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Arthur BIESSE
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Knds Ammo France
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Nexter Munitions SA
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    • 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
    • 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
    • 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 flexible cords under a metal sheath and ensure the triggering of a pyrotechnic event at the end of a determined time interval.
  • They are used, for example, in the munitions sector to cause self-destruction of ammunition that has not reached its target. They are also used in the space sector to create delay cables between different components of a ballistic launcher.
  • compositions combining tungsten, barium chromate and potassium perchlorate. It is also possible to incorporate ultrafine silica into these compositions, as described in the patent FR2706449 .
  • compositions have the advantage of generating little gas and can be put in the form of cords of reduced diameter (sheath diameter less than 4 mm), without risking the cord bursting or stopping combustion.
  • the result is a complex pyrotechnic composition, comprising numerous components whose dosage proves delicate.
  • this composition makes it possible to produce delay cords comprising a sheath based on tin and Bismuth, cords whose external diameter of the sheath is between 7.2 mm and 2.6 mm and which can, by a choice of formulation suitable, ensure a burning speed of 2.64 mm/s to 4.0 mm/s.
  • the subject of the invention is a pyrotechnic delay composition
  • a pyrotechnic delay composition comprising at least one oxidant and at least one reducer, a composition which is characterized in that it comprises tungsten as first reducer, a first oxidant constituted by trifer tetraoxide and a second oxidant having an oxygen content greater than that of the first oxidant, the second oxidant being chosen from among following oxidants: Potassium perchlorate, Barium peroxide, Bismuth oxide, Diiodine pentoxide.
  • Trifertetraoxide is a well-known iron oxide that occurs naturally in the form of the mineral called 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 around 28%.
  • Barium Chromate with the known retard composition can release 63% of its mass in oxygen.
  • the patent WO2017/084916 overcomes this drawback by combining iron oxide with a strong reducing agent such as zirconium. However, the reaction then leads to the production of metal remaining incandescent, the zirconium reacts strongly with the reduced iron causing an intermetallic type reaction. It then becomes necessary to mitigate combustion with slag-generating materials.
  • the invention proposes to retain tungsten as a reducing agent. Indeed its reduction capacity (3.98 grams of reducer for one gram of oxygen) is good although lower than that of Zirconium and it also has a high thermal conductivity (174 Wm -1 K -1 ) which allows it to evacuate calories and reduce the combustion speed of the composition by draining the heat of reaction.
  • the trifer tetraoxide is combined with a second oxidant which has a higher oxygen content than that of the trifer tetraoxide.
  • This second oxidant makes it possible to compensate for the weaknesses of trifer tetraoxide.
  • Potassium perchlorate will preferably be chosen as the second oxidant.
  • the oxygen content of Potassium Perchlorate is 46.2% which is relatively high. A reduced quantity of this oxidant is therefore sufficient to maintain a uniform combustion front.
  • composition according to the invention may include a second reducing agent consisting of aluminum.
  • the retard composition will therefore include: from 20% to 60% by mass of tungsten and from 30% to 70% by mass of trifer tetraoxide.
  • compositions which will now be described, in a non-limiting manner, make it possible to highlight other advantages of the composition according to the invention.
  • the tungsten chosen has a particle size of between 0.2 mm and 0.315 mm.
  • the particle size of trifer 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.
  • the materials are mixed dry and compressed in a ductile tin metal tube with an initial external diameter of 17 mm, then the loaded tube is gradually reduced in diameter by passing through dies to obtain a delay cord with an external diameter of 3 mm.
  • An ignition composition is then placed at the inlet of the tube capable of initiating the delay (for example a classic composition combining Titanium and Carbon).
  • Example 1 39 / 50 11 4.44
  • Example 2 31 8 50 11 4.35
  • Example 3 25 14 50 11 4, 17
  • Example 4 25 8 56 11 3.45
  • aluminum reduces the combustion rate of the delay.
  • compositions could also be shaped under a tin sheath.
  • the combustion speeds 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 of 3.1 mm).

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  • 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)

Description

Le domaine technique de l'invention est celui des compositions retard pyrotechniques.The technical field of the invention is that of pyrotechnic delay compositions.

De telles compositions sont bien connues. Elles sont mises en oeuvre sous forme de colonnes retard rigides ou bien de cordeaux souples sous gaine métallique et permettent d'assurer le déclenchement d'un évènement pyrotechnique à l'issue d'un intervalle de temps déterminé.Such compositions are well known. They are implemented in the form of rigid delay columns or flexible cords under a metal sheath and ensure the triggering of a pyrotechnic event at the end of a determined time interval.

On les utilise par exemple dans le domaine munitionnaire pour provoquer une autodestruction d'une munition qui n'a pas atteint sa cible. On les utilise également dans le domaine spatial pour réaliser des cordeaux retard entre différents composants d'un lanceur balistique.They are used, for example, in the munitions sector to cause self-destruction of ammunition that has not reached its target. They are also used in the space sector to create delay cables between different components of a ballistic launcher.

De nombreuses compositions pyrotechniques ont été mises au point par le passé.Many pyrotechnic compositions have been developed in the past.

Parmi les plus classiques on connaît des compositions associant le tungstène, le chromate de baryum et le perchlorate de potassium. On peut aussi incorporer dans ces compositions de la silice ultrafine, tel que décrit par le brevet FR2706449 .Among the most classic are compositions combining tungsten, barium chromate and potassium perchlorate. It is also possible to incorporate ultrafine silica into these compositions, as described in the patent FR2706449 .

Ces compositions présentent l'avantage de générer peu de gaz et peuvent être mises sous la forme de cordeaux de diamètre réduit (diamètre de gaine inférieur à 4 mm), sans risquer l'éclatement du cordeau ou l'arrêt de combustion.These compositions have the advantage of generating little gas and can be put in the form of cords of reduced diameter (sheath diameter less than 4 mm), without risking the cord bursting or stopping combustion.

Cependant elles mettent en oeuvre un composé à base de chrome (le chromate de Baryum - BaCrO4) pour lequel la toxicité du chrome conduit à son interdiction d'emploi (directives européennes REACH).However, they use a chromium-based compound (Barium chromate - BaCrO4) for which the toxicity of chromium leads to its use being prohibited (European REACH directives).

Il est donc nécessaire de définir une composition retard moins toxique mais ayant les mêmes propriétés que celles de la composition connue : vitesse de combustion réduite (inférieure à 4 mm/s sous gaine souple de diamètre faible (inférieur à 3mm), absence de gaz, fiabilité de la combustion pour toute la gamme de température qui est requise pour les applications militaires et spatiales (de -40°C à +60°C).It is therefore necessary to define a less toxic retardant composition but having the same properties as those of the known composition: reduced combustion speed (less than 4 mm/s under a flexible sheath of small diameter (less than 3mm), absence of gas, combustion reliability for the entire temperature range required for military and space applications (from -40°C to +60°C).

Il a été proposé par le brevet WO2017/084916 de remplacer cette composition par une nouvelle composition retard associant un ou plusieurs oxydes de fer avec du zirconium ou de l'hydrure de zirconium. Cependant cette nouvelle composition est susceptible de générer des points chauds au niveau de la zone de réaction et, selon ce brevet, il est nécessaire de prévoir un ou plusieurs additifs générateurs de scories pour atténuer la réaction.It was proposed by the patent WO2017/084916 to replace this composition with a new depot composition combining one or more iron oxides with zirconium or zirconium hydride. However, this new composition is likely to generate hot spots in the reaction zone and, according to this patent, it is necessary to provide one or more slag-generating additives to attenuate the reaction.

Il en résulte une composition pyrotechnique complexe, comportant de nombreux composants dont le dosage s'avère délicat.The result is a complex pyrotechnic composition, comprising numerous components whose dosage proves delicate.

C'est le but de l'invention que de proposer une composition pyrotechnique retard dépourvue de composés de Chrome, donc conforme aux directives REACH, cette composition retard ayant une formulation assurant un fonctionnement fiable sans arrêt de combustion pour des diamètres réduits.It is the aim of the invention to propose a pyrotechnic delay composition devoid of Chromium compounds, therefore compliant with the REACH directives, this delay composition having a formulation ensuring reliable operation without stopping combustion for reduced diameters.

Plus particulièrement cette composition permet de réaliser des cordeaux retard comportant une gaine à base d'étain et de Bismuth, cordeaux dont le diamètre externe de la gaine est compris entre 7,2 mm et 2,6 mm et pouvant, par un choix de formulation adapté, assurer une vitesse de combustion de 2,64 mm/s à 4,0 mm/s.More particularly, this composition makes it possible to produce delay cords comprising a sheath based on tin and Bismuth, cords whose external diameter of the sheath is between 7.2 mm and 2.6 mm and which can, by a choice of formulation suitable, ensure a burning speed of 2.64 mm/s to 4.0 mm/s.

Ainsi l'invention a pour objet une composition retard pyrotechnique comprenant au moins un oxydant et au moins un réducteur, composition qui est caractérisée en ce qu'elle comporte du tungstène comme premier réducteur, un premier oxydant constitué par le tétraoxyde de trifer et un deuxième oxydant ayant une teneur en oxygène supérieure à celle du premier oxydant, le deuxième oxydant étant choisi parmi les oxydants suivants : Perchlorate de Potassium, Peroxyde de Baryum, Oxyde de Bismuth, Pentoxyde de Diiode.Thus the subject of the invention is a pyrotechnic delay composition comprising at least one oxidant and at least one reducer, a composition which is characterized in that it comprises tungsten as first reducer, a first oxidant constituted by trifer tetraoxide and a second oxidant having an oxygen content greater than that of the first oxidant, the second oxidant being chosen from among following oxidants: Potassium perchlorate, Barium peroxide, Bismuth oxide, Diiodine pentoxide.

Le tétraoxyde de trifer est un oxyde de fer bien connu qui se trouve à l'état naturel sous la forme du minerai appelé magnétite. C'est un matériau non toxique et peu coûteux. Il présente l'inconvénient d'être un oxydant relativement faible. En effet la masse d'oxygène qu'il peut libérer par masse de matériau est de l'ordre de 28%.Trifertetraoxide is a well-known iron oxide that occurs naturally in the form of the mineral called 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 around 28%.

Le risque avec un tel matériau est donc de voir la combustion du retard s'interrompre.The risk with such a material is therefore to see the combustion of the delay being interrupted.

A titre comparatif le Chromate de Baryum de la composition retard connue peut libérer 63% de sa masse en oxygène.For comparison, Barium Chromate with the known retard composition can release 63% of its mass in oxygen.

Le brevet WO2017/084916 pallie cet inconvénient en associant l'oxyde de fer à un réducteur fort tel que le zirconium. Cependant, la réaction conduit alors à la production de métal restant incandescent, le zirconium réagit fortement avec le fer réduit en entraînant une réaction de type intermétallique. Il devient alors nécessaire d'atténuer la combustion avec des matériaux générateurs de scories.The patent WO2017/084916 overcomes this drawback by combining iron oxide with a strong reducing agent such as zirconium. However, the reaction then leads to the production of metal remaining incandescent, the zirconium reacts strongly with the reduced iron causing an intermetallic type reaction. It then becomes necessary to mitigate combustion with slag-generating materials.

L'invention propose au contraire de conserver le tungstène comme réducteur. En effet sa capacité de réduction (3,98 grammes de réducteur pour un gramme d'oxygène) est bonne bien qu'inférieure à celle du Zirconium et il a par ailleurs une forte conductivité thermique (174 Wm-1K-1) ce qui lui permet de d'évacuer les calories et de diminuer la vitesse de combustion de la composition par drainage de la chaleur de réaction.On the contrary, the invention proposes to retain tungsten as a reducing agent. Indeed its reduction capacity (3.98 grams of reducer for one gram of oxygen) is good although lower than that of Zirconium and it also has a high thermal conductivity (174 Wm -1 K -1 ) which allows it to evacuate calories and reduce the combustion speed of the composition by draining the heat of reaction.

Afin d'éviter un arrêt de la combustion du retard, le tétraoxyde de trifer est associé à un deuxième oxydant qui a une teneur en oxygène supérieure à celle du tétraoxyde de trifer.In order to avoid stopping the combustion of the delay, the trifer tetraoxide is combined with a second oxidant which has a higher oxygen content than that of the trifer tetraoxide.

Ce deuxième oxydant permet de pallier les faiblesses du tétraoxyde de trifer.This second oxidant makes it possible to compensate for the weaknesses of trifer tetraoxide.

On pourra choisir un des oxydants suivants : Perchlorate de Potassium, Peroxyde de Baryum, Oxyde de Bismuth, Pentoxyde de Diiode.We can choose one of the following oxidants: Potassium Perchlorate, Barium Peroxide, Bismuth Oxide, Diiodine Pentoxide.

On choisira de façon préférée le Perchlorate de Potassium comme deuxième oxydant. En effet la teneur en oxygène du Perchlorate de potassium est de 46,2% ce qui est relativement élevé. Il suffit donc d'une quantité réduite de cet oxydant pour garder un front de combustion uniforme.Potassium perchlorate will preferably be chosen as the second oxidant. In fact, the oxygen content of Potassium Perchlorate is 46.2% which is relatively high. A reduced quantity of this oxidant is therefore sufficient to maintain a uniform combustion front.

Avantageusement la composition selon l'invention pourra comporter un deuxième réducteur constitué par l'aluminium.Advantageously, the composition according to the invention may include a second reducing agent consisting of aluminum.

Cet ajout d'aluminium permet de corriger la vitesse de combustion du retard.This addition of aluminum makes it possible to correct the combustion speed of the delay.

La composition retard comprendra donc: de 20% à 60% en masse de tungstène et de 30% à 70% en masse de tétraoxyde de trifer.The retard composition will therefore include: from 20% to 60% by mass of tungsten and from 30% to 70% by mass of trifer tetraoxide.

Plus précisément, la composition retard selon l'invention aura la composition suivante :

  • 20% à 60% en masse de tungstène,
  • 30% à 70% en masse de tétraoxyde de trifer,
  • 1% à 30% en masse de perchlorate de potassium,
  • 0% à 10 % en masse d'aluminium.
More precisely, the delay composition according to the invention will have the following composition:
  • 20% to 60% by mass of tungsten,
  • 30% to 70% by mass of trifer tetraoxide,
  • 1% to 30% by mass of potassium perchlorate,
  • 0% to 10% by mass of aluminum.

D'une façon préférée, la composition retard selon l'invention aura la composition suivante :

  • 30% à 40% en masse de tungstène,
  • 45% à 55% en masse de tétraoxyde de trifer,
  • 5% à 15% en masse de perchlorate de potassium,
  • 0% à 10% en masse d'aluminium.
Preferably, the delay composition according to the invention will have the following composition:
  • 30% to 40% by mass of tungsten,
  • 45% to 55% by mass of trifer tetraoxide,
  • 5% to 15% by mass of potassium perchlorate,
  • 0% to 10% by mass of aluminum.

Les exemples de compositions qui vont être décrits maintenant, de façon non limitative, permettent de mettre en évidence d'autres avantages de la composition selon l'invention.The examples of compositions which will now be described, in a non-limiting manner, make it possible to highlight other advantages of the composition according to the invention.

Dans toutes les compositions réalisées, le tungstène choisi a une granulométrie comprise entre 0,2 mm et 0,315 mm.In all the compositions produced, the tungsten chosen has a particle size of between 0.2 mm and 0.315 mm.

La granulométrie du tétraoxyde de trifer est comprise entre 0,2 mm et 0,315 mm.The particle size of trifer tetraoxide is between 0.2 mm and 0.315 mm.

Celle du perchlorate de potassium est entre 0,2 mm et 0,315 mm.That of potassium perchlorate is between 0.2 mm and 0.315 mm.

Celle de l'Aluminium est entre 0,2 mm et 0,315 mm.That of Aluminum is between 0.2 mm and 0.315 mm.

Une première série d'essais a été réalisée avec des compositions retard sous cordeau étain.A first series of tests was carried out with delay compositions under tin cord.

Les matériaux sont mélangés à sec et comprimés dans un tube métallique ductile en étain de 17 mm de diamètre extérieur initial puis le tube chargé est progressivement réduit en diamètre par passage au travers de filières pour obtenir un cordeau retard de 3 mm de diamètre extérieur.The materials are mixed dry and compressed in a ductile tin metal tube with an initial external diameter of 17 mm, then the loaded tube is gradually reduced in diameter by passing through dies to obtain a delay cord with an external diameter of 3 mm.

On place ensuite une composition d'allumage en entrée du tube pouvant amorcer le retard (par exemple une composition classique associant Titane et Carbone).An ignition composition is then placed at the inlet of the tube capable of initiating the delay (for example a classic composition combining Titanium and Carbon).

On réalise ainsi plusieurs tubes ayant une longueur de 300 mm. On mesure ensuite la durée de combustion de chaque tube chargé de composition retard.Several tubes with a length of 300 mm are thus produced. The combustion duration of each tube loaded with retardant composition is then measured.

Le tableau ci-dessous liste différentes compositions qui ont été réalisées et dont on a mesuré la vitesse de combustion. Les pourcentages qui sont donnés sont relatifs à la masse totale de la composition. Tungstène W (%) Aluminium Al (%) Tétraoxyde de trifer Fe3O4 (%) Perchlorate de potassium KClO4 (%) Vitesse de combustion (mm/s) Exemple 1 39 / 50 11 4,44 Exemple 2 31 8 50 11 4,35 Exemple 3 25 14 50 11 4, 17 Exemple 4 25 8 56 11 3,45 The table below lists different compositions which have been produced and whose combustion speed has been measured. The percentages given are relative to the total mass of the composition. Tungsten W (%) Aluminum Al (%) Trifer tetraoxide Fe 3 O 4 (%) Potassium perchlorate KClO 4 (%) Burning speed (mm/s) Example 1 39 / 50 11 4.44 Example 2 31 8 50 11 4.35 Example 3 25 14 50 11 4, 17 Example 4 25 8 56 11 3.45

On remarque que l'augmentation relative de la masse de tétraoxyde de trifer permet de réduire la vitesse de combustion (exemple 4).We note that the relative increase in the mass of trifer tetraoxide makes it possible to reduce the combustion speed (example 4).

En confinement sous gaine, l'aluminium diminue la vitesse de combustion du retard.In cladding confinement, aluminum reduces the combustion rate of the delay.

D'autres essais ont permis de vérifier que, si le Perchlorate de potassium était omis, l'initiation du retard ne pouvait pas se faire avec la composition d'allumage choisie (Titane / carbone). Mais d'autres compositions d'allumage pourraient être envisagées.Other tests made it possible to verify that, if the potassium perchlorate was omitted, the initiation of the delay could not be done with the chosen ignition composition (Titanium / carbon). But other ignition compositions could be considered.

Une autre série d'essais a été réalisée avec d'autres compositions dans lesquelles on a fait varier le taux d'aluminium.Another series of tests was carried out with other compositions in which the aluminum content was varied.

Ces essais ont été réalisés dans une configuration d'allumage de la composition sur une gouttière, donc sans le confinement assuré par un cordeau.These tests were carried out in a configuration of lighting the composition on a gutter, therefore without the confinement provided by a cord.

Les résultats sont synthétisés dans le tableau suivant : Tungstène W (%) Aluminium Al (%) Tétraoxyde de trifer Fe3O4 (%) Perchlorate de potassium KClO4 (%) Vitesse de combustion (mm/s) Exemple 5 38 1 50 11 0,87 Exemple 6 35 4 50 11 1,01 The results are summarized in the following table: Tungsten W (%) Aluminum Al (%) Trifer tetraoxide Fe 3 O 4 (%) Potassium perchlorate KClO 4 (%) Burning speed (mm/s) Example 5 38 1 50 11 0.87 Example 6 35 4 50 11 1.01

On remarque l'effet accélérateur de la combustion assuré par l'aluminium dans cette configuration de combustion non confinée.We note the accelerating effect of combustion provided by the aluminum in this unconfined combustion configuration.

Ces dernières compositions pourraient également être mises en forme sous gaine d'étain. Les vitesses de combustion seraient alors plus fortes (de l'ordre de 3,5 mm/s à 4,5 mm/s pour une gaine d'étain de diamètre externe 3,1 mm).These latter compositions could also be shaped under a tin sheath. The combustion speeds 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 of 3.1 mm).

Claims (11)

  1. - Pyrotechnic delay composition comprising at least one oxidant and at least one reducing agent, the composition being characterised in that it comprises tungsten as the first reducing agent, a first oxidant consisting of triiron tetraoxide and a second oxidant having an oxygen content greater than that of the first oxidant, the second oxidant being selected from among the following oxidants: potassium perchlorate, barium peroxide, bismuth oxide, diiodine pentoxide.
  2. - Pyrotechnic delay composition according to claim 1, characterised in that it comprises a second reducing agent consisting of aluminum.
  3. - Pyrotechnic delay composition according to any one of claims 1 and 2, characterised in that it comprises: from 20% to 60% by weight of tungsten, and from 30% to 70% by weight of triiron tetraoxide.
  4. - Pyrotechnic delay composition according to claim 3, characterised in that it comprises:
    20% to 60% by weight of tungsten,
    30% to 70% by weight of triiron tetraoxide,
    1% to 30% by weight of potassium perchlorate,
    0% to 14% by weight of aluminum.
  5. - Pyrotechnic delay composition according to claim 4, characterised in that it comprises:
    30% to 40% by weight of tungsten,
    45% to 55% by weight of triiron tetraoxide,
    5% to 15% by weight of potassium perchlorate,
    0% to 14% by weight of aluminum.
  6. - Pyrotechnic delay composition according to claim 5, characterised in that it comprises:
    39% by weight of tungsten,
    50% by mass of triiron tetraoxide,
    11% by weight of potassium perchlorate.
  7. - Pyrotechnic delay composition according to claim 5, characterised in that it comprises:
    31% by weight of tungsten,
    8% by weight of aluminum,
    50% by weight of triiron tetraoxide,
    11% by weight of potassium perchlorate.
  8. - Pyrotechnic delay composition according to claim 4, characterised in that it comprises:
    25% by weight of tungsten,
    14% by weight of aluminum,
    50% by weight of triiron tetraoxide,
    11% by weight of potassium perchlorate.
  9. - Pyrotechnic delay composition according to claim 4, characterised in that it comprises:
    25% by weight of tungsten,
    8% by weight of aluminum,
    56% by weight of triiron tetraoxide,
    11% by weight of potassium perchlorate.
  10. - Pyrotechnic delay composition according to claim 5, characterised in that it comprises:
    38% by weight of tungsten,
    1% by weight of aluminum,
    50% by weight of triiron tetraoxide,
    11% by weight of potassium perchlorate.
  11. - Pyrotechnic delay composition according to claim 5, characterised in that it comprises:
    35% by weight of tungsten,
    4% by weight of aluminum,
    50% by weight of triiron tetraoxide,
    11% by weight of potassium perchlorate.
EP19151002.3A 2018-01-17 2019-01-09 Pyrotechnical delay composition Active EP3514132B1 (en)

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FR1800062A FR3076830B1 (en) 2018-01-17 2018-01-17 PYROTECHNIC DELAY COMPOSITION

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EP3514132B1 true EP3514132B1 (en) 2023-10-04

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BR0303546B8 (en) * 2003-09-19 2013-02-19 Thermal shock tube.
DE102015014379A1 (en) * 2015-11-09 2017-05-11 Dynitec Gmbh Pyrotechnic delay element
DE102015014821A1 (en) * 2015-11-18 2017-05-18 Rheinmetall Waffe Munition Gmbh REACh-compliant pyrotechnic delay and ignition charge with variably adjustable performance parameters

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FR3076830B1 (en) 2022-01-28
US20200024211A1 (en) 2020-01-23
FR3076830A1 (en) 2019-07-19

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