EP1101076A1 - Procede de mise en oeuvre d'une substance pyrotechnique et initiateur pyrotechnique obtenu avec un tel procede - Google Patents
Procede de mise en oeuvre d'une substance pyrotechnique et initiateur pyrotechnique obtenu avec un tel procedeInfo
- Publication number
- EP1101076A1 EP1101076A1 EP99934807A EP99934807A EP1101076A1 EP 1101076 A1 EP1101076 A1 EP 1101076A1 EP 99934807 A EP99934807 A EP 99934807A EP 99934807 A EP99934807 A EP 99934807A EP 1101076 A1 EP1101076 A1 EP 1101076A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pyrotechnic
- substance
- binder
- initiator
- composition
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/195—Manufacture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/12—Bridge initiators
- F42B3/124—Bridge initiators characterised by the configuration or material of the bridge
Definitions
- the field of the present invention is that of methods of using pyrotechnic substances to produce a pyrotechnic component.
- Such a component generally comprises a pyrotechnic substance sensitive to shock or to heating (primary explosive) which is intended to initiate a reinforcing pyrotechnic composition (flame for an igniter or shock for a detonator).
- a pyrotechnic substance sensitive to shock or to heating primary explosive
- a reinforcing pyrotechnic composition flame for an igniter or shock for a detonator
- This primary explosive can be mixed with the reinforcing composition (as in patents EP600791 and FR2720493) or adjacent to it (as in patent GB960186).
- the sensitive substance most often includes a primary explosive, such as lead trinitroresorcinate, lead azide or silver azide.
- a primary explosive such as lead trinitroresorcinate, lead azide or silver azide.
- the electrical initiation pyrotechnic components use a resistive element, such as a hot wire or a semiconductor wafer.
- Patents EP600791 and FR2720493 describe such electric initiators intended more particularly to be used for triggering automobile safety devices
- the loading of a pulverulent material implies a minimum of filling of the bottom of the cell of the component in order to completely cover the resistive element. This results in an overabundant implementation of the primary substance which penalizes both the manufacturing cost and safety.
- the powder material must be compressed. The resistive element can undergo during this compression considerable stresses which can cause its rupture.
- Another known embodiment provides for a suspension of the sensitive pyrotechnic substance in a liquid solvent in which a binder (of active type or not) is dissolved.
- a binder of active type or not
- the usual solvents are water, alcohol or acetone. The solvent is removed by heating or drying after placing the composition.
- the resistive element is now produced in the form of a semiconductor bridge, the dimensions of the resistive bridge are therefore very small (of the order of 50 micrometers x 150 micrometers) and it therefore becomes essential to use a sensitive pyrotechnic substance. which is of a very fine grain size, smaller than the dimensions of the bridge (grain size less than 50 micrometers). Such a choice increases the difficulties of placing the primary substance, the sensitivity of which is increased by the fineness of the particle size.
- the invention provides a method of implementing a pyrotechnic substance which makes it possible both to reduce the risks for the personnel attached to its manufacture and to reduce the costs of producing pyrotechnic components such as the initiators.
- the method according to the invention also makes it possible to define a pyrotechnic component for automobile safety systems whose reliability is improved and whose non-toxicity is ensured.
- the subject of the invention is a method of using at least one pyrotechnic substance to produce a pyrotechnic component, in particular an initiator with a resistive bridge, a method characterized in that:
- At least one pulverulent pyrotechnic substance is suspended in an inert binder, liquid or pasty, and capable of hardening by polymerization, the pyrotechnic material thus formed is put in place in the liquid or pasty state in the component,
- the material is polymerized at least partially in situ by radiation or bombardment to harden the binder carrying the pyrotechnic substance or substances, the polymerization being completed by heating the composition.
- the binder will be chosen so as to be at least partially polymerized by ultraviolet radiation. It will be possible to choose an ultraviolet source also emitting in the infrared domain, a source which will thus ensure the heating of the composition.
- the composition can be heated by an oven.
- the binder may be constituted by a photosensitive resin based on natural or synthetic resin
- the base resin may then be chosen from the following resins: acrylic resin, polyurethane resin.
- the pyrotechnic substance may comprise at least one primary explosive.
- the pyrotechnic substance will contain as primary explosive a dinitro-benzo-furoxane salt.
- the pyrotechnic material may comprise 40 to 60% by mass of pyrotechnic substance in suspension in 60% to 40% by mass of resin.
- a portion of the liquid or pasty pyrotechnic material is deposited on a resistive element of a pyrotechnic initiator, then the binder is cured by subjecting this material to ultraviolet radiation associated with heating .
- the heating temperature will be chosen below 140 ° C, and preferably between 80 ° C and 100 ° C.
- the subject of the invention is also a pyrotechnic initiator with a resistive element using at least one pyrotechnic substance thus used, an initiator which is characterized in that the resistive element is completely covered by a pyrotechnic initiation material formed from the pyrotechnic substance or substances incorporated in an inert binder hardened by polymerization by ultraviolet radiation associated with heating.
- This pyrotechnic initiator may include a pyrotechnic composition placed in contact with the initiating pyrotechnic material and compressed thereon.
- the resistive element may be a semiconductor bridge.
- the average particle size of the pyrotechnic substance will then be less than or equal to 50 micrometers.
- the pyrotechnic substance incorporated into the binder will preferably be a dinitro benzo furoxane salt, for example potassium dinitro benzo furoxanate.
- the pyrotechnic composition may be chosen from the following compositions: Zirconium / potassium perchlorate, Boron / potassium nitrate.
- a pyrotechnic initiator 1 comprises a metal casing 2 (for example made of stainless steel) on which a plastic molding 3 of the polyamide or polycarbonate type is produced.
- the housing 2 is closed by a plug 4 also made of plastic.
- the housing 2 comprises a cylindrical wall 5 welded to a bottom 6 which is traversed completely by an electrode 7a and partially by an electrode 7b.
- the electrode 7b is in electrical contact with the bottom 6 and the electrode 7a is electrically insulated from the bottom by an insulating sleeve 8 (for example made of glass).
- a semiconductor wafer 14 is formed of an insulating substrate 9 based on undoped silicon which is bonded to the bottom 6. This wafer comprises a semiconductor bridge 10 (for example in doped silicon) which is partially covered by two conductive pads 11a, 11b, for example aluminum.
- the spacing between the pads is between 60 and 100 micrometers and preferably of the order of 80 micrometers.
- the stud 11b is connected to the electrode 7a by a connecting wire 12 fixed by welding.
- the pad 11a is connected to the electrode 7b via the metal bottom 6 through a semiconductor well 13 (doped silicon) which passes through the insulating substrate 9.
- a pyrotechnic initiation material 15 (which is therefore sensitive to heating) is deposited on the wafer 14 and also covers the wire 12 and the welds.
- This pyrotechnic material consists of at least one pulverulent pyrotechnic substance mixed with a hardened inert binder.
- the average particle size of the pyrotechnic substance will be chosen to be of the same order of magnitude as the dimensions of the semiconductor bridge. Such an arrangement ensures thermal transfer by convection and / or projection during the rise in temperature of the semiconductor bridge. This ensures reliable initiation of the pyrotechnic substance by the resistive bridge.
- the bridge generally has dimensions of the order of 50 micrometers x 150 micrometers. We therefore adopt for the composition a particle size less than or equal to 50 micrometers.
- the inert binder chosen will be at room temperature a liquid or a paste and will be capable of hardening by in situ polymerization. Once cured, the material 15 formed of the binder carrying the pyrotechnic substance covers and protects both mechanically and chemically the wafer 14 as well as the wire 12 and its welds. A reinforcing pyrotechnic composition 16 fills the entire housing 2. It is therefore in contact with the initiating pyrotechnic material 15 and can be initiated by the latter.
- the pyrotechnic composition may be compressed in the casing, in particular by means of the plug 4.
- the material 15 protects the resistive bridge as well as the plate, the wire and the welds which cannot therefore be damaged.
- the reliability of the initiator according to the invention is therefore increased.
- initiation material 15 only on the wafer 14.
- the process for using the pyrotechnic substance according to the invention provides the initiation pyrotechnic material 15. This process is as follows:
- the powdery pyrotechnic substance or substances are mixed with the inert binder.
- a primary explosive will be chosen, for example lead trinitroresorcinate, lead azide, silver azide, or a dinitro benzo furoxane salt such as dinitro benzo potassium furoxanate (or KDNBF).
- Dinitro benzo furoxane salts will be preferred because of their non-toxicity (absence of lead or heavy metals).
- the polymerizable binder will be chosen to be chemically compatible with the primary explosive (s) used (not inducing a reaction with it during the aging phases).
- the binder will preferably be chosen from among the photosensitive resins (which incorporate a photosensitizer in a known manner) and which are produced from synthetic resins. These resins are therefore (depending on the choice made) polymerizable by radiation (ultraviolet, X, microwave) or by bombardment (electronic).
- Photosensitive resins are known and commercially available and it is possible in particular to choose a photosensitive resin, the base resin of which will be chosen from the following resins: acrylic resin, epoxy resin, polyurethane resin, silicone resin, polyester resin, anaerobic resin (resin not polymerizing only in the absence of air).
- a drop of such a photosensitive resin is exposed to UV, the radiation causes a surface polymerization isolating the rest of the resin.
- the core polymerization will be obtained (depending on the resin chosen) by heating, or chemical reaction (the anaerobic photosensitive resins in particular will be able to completely polymerize after UV exposure because they will be isolated from the air by the crust resulting from the UV polymerization of the surface of the drop).
- the viscosity of the binder will be chosen according to the characteristics of the system for depositing the material in the component. Rather liquid resins are preferred to facilitate the distribution of the material.
- binder / primary pyrotechnic substance The relative proportions of binder / primary pyrotechnic substance will be chosen by a person skilled in the art according to the sensitivity desired for the final material and that of the primary explosive used. We can adopt proportions of between 40% and 60% by mass for the pyrotechnic substance and 60% and 40% by mass for the binder. An equal 50/50 proportion may be adopted.
- a first advantage of this first implementation step is that the primary explosive, the particle size of which is extremely fine, is coated with a binder which desensitizes. The preservation of the material can thus be ensured away from light (to avoid hardening) and safely.
- a second advantage of this implementation is that the liquid or pasty mixture (depending on the viscosity of the resin used) can be easily distributed mechanically in the housing of the pyrotechnic component to be produced, for example using a syringe or '' a worm hopper
- a third advantage is that it is possible with the method according to the invention to minimize the quantity of primary pyrotechnic substance with reduced particle size disposed in each component while precisely dosing said quantity. It is thus no longer necessary to fill the bottom of the housing with a sensitive composition to ensure the covering of the resistive bridge. For example, a single drop of approximately 1 milligram ensures the recovery of this bridge and the proper functioning of the component, whereas it was necessary with the previous processes to deposit nearly 30 milligrams of a powder composition.
- the pyrotechnic material in the component After placing the pyrotechnic material in the component, it is hardened by polymerization (3rd step).
- a commercially available source of ultraviolet radiation (wavelength 365 nanometers) will be used for this, which will be placed at a distance from the material of 20 to 35 mm.
- a lamp reference Pkl02 produced by the company Fisnar. This lamp has a power of 400 W, it radiates in the Ultraviolet range between 320 nanometers and 390 nanometers and also provides a heating temperature of 100 ° to 40mm away.
- the exposure time of the material will be easily determined according to the characteristics of the resin chosen and the total mass to be polymerized. This exposure time is for example less than 10 minutes for a mass of approximately
- the infrared thus provide heating of the composition (or post-curing) which will result in the complete polymerization of the composition.
- This heating can alternatively be provided by conventional means, such as passage through the oven.
- UV exposure consumes energy and imposes precautions from the point of view of implementation by personnel (protective covers).
- the heating means will be chosen so as not to overheat the pyrotechnic component so as not to initiate it (generally the rate of temperature rise must be less than 0.5 ° C / second), the temperature oven temperature or that provided by the unfiltered UV source must not exceed 140 ° C.
- the pyrotechnic composition 16 is loaded in a conventional manner (placing in the granular state by hopper, plugging of the component, compression in situ, welding of the plug 4 on the overmolding 3).
- a pyrotechnic material was thus produced combining 53% by mass (or 0.54 mg) of a polyurethane resin with a viscosity of 110 centipoises with 47% by mass of KDNBF (ie 0.48 mg).
- the resin is a resin of the 602 series produced by UVEXS Incorporated (580 North Pastoria Avenue Sunnyvale California).
- the initiators produced were then loaded with 120 mg of a pyrotechnic composition 16 associating Zirconium and potassium perchlorate in the conventional proportions of 60% by mass of Zirconium for 40% by mass of perchlorate.
- the initiation tests carried out made it possible to measure an initiation time Tf of less than 500 microseconds and an output pressure of the component greater than 5 MPa (tests conducted in a 3 cm 3 pressure bomb with an initiation current intensity 1.5 amps No misfire was found for 50 components tested.
- This component uses only 1.1 milligrams of initiation pyrotechnic material.
- the performance obtained is however analogous to that of a conventional component in which nearly 30 milligrams of a powdery initiation composition of lead styphnate are used and associated with 50 mg of reinforcing composition Bore / potassium nitrate.
- a pyrotechnic material was also produced combining 40% by mass (i.e. 2.4 mg) of an acrylic resin of viscosity 110 centipoises with 60% by mass of KDNBF (i.e.
- the resin is a resin reference 30-23 produced by the company Loxeal srl (via Gioberti 20031 Cesano Maderno
- the initiators produced were then loaded with 120 mg of a pyrotechnic composition 16 associating Zirconium and potassium perchlorate in the conventional proportions of 60% by mass of Zirconium for 40% by mass of perchlorate.
- the initiation tests conducted also made it possible to measure an initiation time Tf of less than 500 microseconds and an outlet pressure of the component greater than 5 MPa (tests conducted in a 3 cm 3 pressure bomb with a current intensity of initiation of 1.5 amps No misfire was found for 50 components tested.
- This component uses only 6 milligrams of initiation pyrotechnic material.
- the performance obtained is however analogous to that of a conventional component in which nearly 30 milligrams of a powdery initiation composition of lead styphnate are used and associated with 50 mg of reinforcing composition Bore / potassium nitrate.
- the mass of composition used is greater (6 mg versus l, 1 mg in the first example).
- the volume of the drop is also greater and improves the protection of the resistive element (in particular the connection wire and the welds. This thus increases reliability.
- a pyrotechnic material incorporating a dinitro benzo furoxane salt (lead-free primary explosive) with an energetic lead-free pyrotechnic composition (such as Zirconium (60%) / potassium perchlorate (40% ) or Boron (25%) / potassium nitrate (75%)).
- an energetic lead-free pyrotechnic composition such as Zirconium (60%) / potassium perchlorate (40% ) or Boron (25%) / potassium nitrate (75%).
- Dinitro benzo furoxane salts are interesting because of their non-toxicity, but they have the disadvantages of being expensive and not very energetic. Thanks to the invention it is possible to minimize the necessary quantity of this explosive in the form of a suspension in a drop of solidifiable binder (less than 1 mg primary explosive) which is in intimate contact with the resistive bridge. Its low energy level is nevertheless sufficient to allow the initiation of the composition Zr / KC10 4 or
- the structure of the initiator (shape of the housing, of the plug, presence or not of an overmolding) can of course be different.
- the method according to the invention makes it possible to simplify and make safer the manufacture of the pyrotechnic components, while protecting the resistive element from the mechanical stresses undergone during in particular the compression of the pyrotechnic composition.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Air Bags (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9809905 | 1998-07-31 | ||
FR9809905A FR2781878B1 (fr) | 1998-07-31 | 1998-07-31 | Procede de mise en oeuvre d'une substance pyrotechnique et initiateur pyrotechnique obtenu avec un tel procede |
PCT/FR1999/001872 WO2000008412A1 (fr) | 1998-07-31 | 1999-07-29 | Procede de mise en oeuvre d'une substance pyrotechnique et initiateur pyrotechnique obtenu avec un tel procede |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1101076A1 true EP1101076A1 (fr) | 2001-05-23 |
EP1101076B1 EP1101076B1 (fr) | 2003-05-28 |
Family
ID=9529310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99934807A Expired - Lifetime EP1101076B1 (fr) | 1998-07-31 | 1999-07-29 | Procede de mise en oeuvre d'une substance pyrotechnique et initiateur pyrotechnique obtenu avec un tel procede |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1101076B1 (fr) |
AT (1) | ATE241796T1 (fr) |
DE (1) | DE69908372T2 (fr) |
ES (1) | ES2195592T3 (fr) |
FR (1) | FR2781878B1 (fr) |
WO (1) | WO2000008412A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2239535A1 (fr) | 2009-04-10 | 2010-10-13 | Nexter Munitions | Dispositif de mise à feu de munition par percussion |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2809806B1 (fr) * | 2000-05-30 | 2003-01-10 | Livbag Snc | Initiateur electro-pyrotechnique a pont en couche mince et a tres basse energie de fonctionnement |
FR2833693B1 (fr) * | 2001-12-14 | 2004-03-12 | Livbag Snc | Procede de realisation d'un initiateur electro-pyrotechnique par emploi d'une colle aqueuse |
US6941867B2 (en) * | 2002-07-01 | 2005-09-13 | Special Devices, Inc. | Initiator with a slip plane between an ignition charge and an output charge |
FR2877720B1 (fr) * | 2004-11-05 | 2009-11-06 | Davey Bickford Snc | Procede de realisation d'une interface electropyrotechnique entre un pont electrothermique et une composition primaire au sein d'un initiateur, initiateur obtenu |
AT510474B1 (de) * | 2010-09-30 | 2013-11-15 | Electrovac Metall Glaseinschmelzungs Gmbh | Lötverbindung |
DE102019116464A1 (de) * | 2019-06-18 | 2020-12-24 | NEFZER SPECIAL EFFECTS GmbH | Filmeffektzünder und Verfahren zum Herstellen |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB960186A (en) | 1961-10-19 | 1964-06-10 | Bendix Corp | Electrically triggered squib |
BE632157A (fr) * | 1962-05-10 | |||
US3906858A (en) * | 1974-07-30 | 1975-09-23 | Us Eneregy Research And Dev Ad | Miniature igniter |
DE2809279C3 (de) * | 1978-03-03 | 1980-11-27 | Deutsch-Franzoesisches Forschungsinstitut Saint-Louis, Saint-Louis (Frankreich) | Treibladungsmassen für Rohrwaffen |
FR2714457A1 (fr) * | 1984-01-27 | 1995-06-30 | Poudres & Explosifs Ste Nale | Tête à aérosol explosif. |
DE3815436A1 (de) * | 1988-05-06 | 1989-11-16 | Muiden Chemie B V | Treibladungen fuer grosskalibrige geschosse |
FR2698687B1 (fr) | 1992-12-01 | 1995-02-03 | Giat Ind Sa | Initiateur pyrotechnique. |
US5728964A (en) * | 1993-10-20 | 1998-03-17 | Quantic Industries, Inc. | Electrical initiator |
FR2720493B1 (fr) | 1994-05-31 | 1996-07-19 | Giat Ind Sa | Initiateur pyrotechnique. |
US5939660A (en) * | 1997-03-12 | 1999-08-17 | Trw Inc. | Inflator for an inflatable vehicle occupant protection device |
-
1998
- 1998-07-31 FR FR9809905A patent/FR2781878B1/fr not_active Expired - Fee Related
-
1999
- 1999-07-29 DE DE69908372T patent/DE69908372T2/de not_active Expired - Fee Related
- 1999-07-29 AT AT99934807T patent/ATE241796T1/de not_active IP Right Cessation
- 1999-07-29 WO PCT/FR1999/001872 patent/WO2000008412A1/fr active IP Right Grant
- 1999-07-29 ES ES99934807T patent/ES2195592T3/es not_active Expired - Lifetime
- 1999-07-29 EP EP99934807A patent/EP1101076B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0008412A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2239535A1 (fr) | 2009-04-10 | 2010-10-13 | Nexter Munitions | Dispositif de mise à feu de munition par percussion |
Also Published As
Publication number | Publication date |
---|---|
FR2781878B1 (fr) | 2001-02-16 |
FR2781878A1 (fr) | 2000-02-04 |
WO2000008412A1 (fr) | 2000-02-17 |
EP1101076B1 (fr) | 2003-05-28 |
DE69908372T2 (de) | 2004-04-01 |
ATE241796T1 (de) | 2003-06-15 |
ES2195592T3 (es) | 2003-12-01 |
DE69908372D1 (de) | 2003-07-03 |
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