Abstract: The present invention relates to a dry process for the manufacture of pyrotechnic objects from at least one reducing charge selected from guanidine derivatives, metal hydrides, alkali metal hydrides and alkaline earth metal hydrides, and at least one oxidizing charge selected from alkali metal nitrates, alkaline earth metal nitrates and basic metal nitrates, at least one of said reducing and oxidizing charges having the property of flowing under stress. Said process makes it possible to obtain pellets and small tablets directly by compaction/compression, to obtain granules, usable as such, by compaction and then granulation, and to obtain compressed objects by compaction, granulation and then compression. The high-performance pyrotechnic objects obtained constitute a further subject of the invention.

Abstract: The technical field of the invention is that of pyrotechnic actuators including a piston and having the essential function of exerting thrust to move an object by causing the piston to emerge. The invention relates more particularly to a pyrotechnic gas generator (2), a combustion chamber (3), a piston (10) capable of moving in a slide chamber (4) under the effect of said gas, the two chambers (3, 4) being in communication with each other. The main characteristic of this actuator is that it comprises a shutter device (5) implemented after said actuator (1) has been triggered to interrupt the communication between said chambers (3, 4), said shutter device (5) being included in the slide chamber (4).

Abstract: The present invention relates to a process for the preparation of novel ammonium dinitroamide (ADN) crystals and to said novel ADN crystals. Said novel crystals have an original morphology factor, namely a low shape factor. They are obtained in the presence of at least one crystal habit modifier.

Abstract: The invention relates to a safety device for raising the bonnet of a motor vehicle in the event of a collision with a pedestrian. The safety device includes a pyrotechnic actuator provided with a thrust piston secured to a mechanism for raising the bonnet and able to deploy the said mechanism which is itself secured to the said bonnet, and a blocking device intended to block the said actuator in a given position. The main characteristic of this device is that it is made up of a shock-absorbing device employed when a pedestrian hits the bonnet which has been raised, so that the assembly consisting of the bonnet, the raising mechanism and the piston can move under the effect of the impact while at the same time being retarded.

Abstract: The present invention relates to solid compounds which generate hydrogen by combustion, and to a method for generating hydrogen based on the combustion of said compounds. Said compounds have a composition which includes at least one inorganic borohydride, selected from alkali borohydrides, alkaline-earth borohydrides and mixtures thereof, and at least one inorganic oxidant. Characteristically, said composition comprises sulfur. Said method is advantageously implemented for supplying hydrogen to a fuel cell.

Abstract: The invention relates to a constant force pyrotechnic actuator comprising a pyrotechnic gas generator, a body, a piston capable of moving in the said body under the effect of the gases emitted by the generator, and a pressure regulator member situated inside the piston, the said piston having a front face traversed by a duct making it possible to place in communication the space separating the gas generator and the said piston, and an inner space in which the regulator member is housed. Within said actuator, the piston is extended by a hollow push rod terminating in an enlarged head, the said head having gas discharge ducts, and the inner space of the said rod is in communication with the inner space of the piston in which the regulator member is housed.

Abstract: The technical field of the invention is that of the devices used in the field of automotive safety to protect a pedestrian in the event of a frontal impact between the said pedestrian and a motor vehicle. More specifically, the invention relates to a safety device (1, 101, 201) for raising the bonnet (11, 111, 211) of a motor vehicle in the event of a collision with a pedestrian, comprising a pyrotechnic actuator (2, 102, 202, 302) provided with a thrust piston (17, 117) secured to a mechanism for raising the bonnet (11, 111, 211) and able to deploy the said mechanism which is itself secured to the said bonnet (11, 111, 211), and a blocking device intended to block the said actuator (2, 102, 202, 302) in a given position.

Abstract: The invention relates to a thermal erosion test device for testing thermal protection materials for use in a solid propellant thruster. The device comprises a support for holding a plate made of the thermal protection material for testing so that its faces a face of a block of solid propellant, the space between the plate and the face of the propellant block defining a combustion chamber of substantially rectangular shape, said chamber extending along said plate and opening out into a nozzle.

Abstract: The technical field of the invention is that of pyrotechnic actuators including a piston and having the essential function of exerting thrust to move an object by causing the piston to emerge. The invention relates more particularly to a pyrotechnic gas generator (2), a combustion chamber (3), a piston (10) capable of moving in a slide chamber (4) under the effect of said gas, the two chambers (3, 4) being in communication with each other. The main characteristic of this actuator is that it comprises a shutter device (5) implemented after said actuator (1) has been triggered to interrupt the communication between said chambers (3, 4), said shutter device (5) being included in the slide chamber (4).

Abstract: The invention relates to a microsystem and a method for fabricating a microsystem. The pyrotechnic microsystem (7, 1?) comprises a substrate having at least two separate electrical initiation zones, each of which provides separate electrical initiation of a pyrotechnic material deposited on the substrate. This microsystem (7, 1?) is characterized in that the same pyrotechnic material deposit (721, 721?, 13) covers both initiation zones, said deposit (721, 721?, 13) produced on the substrate having a thickness sufficiently small for the initiation of the pyrotechnic material in the initiation zone to remain localized and not propagate to the other initiation zone, but sufficient to generate a specific gas quantity.

Abstract: Set of equipment (1) for a motor vehicle includes an inflatable structure (2), a support (4) for the inflatable structure, elements for (6) inflating the structure in a direction of inflation (D) in order to deploy it, a plate (8) for spreading the load when an occupant of the vehicle impacts on the deployed inflatable structure, and elements for guiding the structure as it deploys so that, in the deployed configuration, the structure extends along a median directrix line (L) distinct from its direction of inflation (D). The guide elements include the side wall (12) of the structure which, in the deployed configuration, is substantially taut.

Abstract: The technical field of the invention is that of pyrotechnic actuators comprising a piston, the basic function of which is to exert a thrust so as to displace an object by shooting out the piston. More particularly, the invention relates to a pyrotechnic actuator (1, 1a, 1b, 1c) comprising a pyrotechnic-gas generator (7), a combustion chamber (3) and a piston (9) which can move in a slide chamber (5) under the effect of the said gases. The principal characteristic of this actuator is that it comprises a shut-off device (4, 4a, 4b, 4c) used after the triggering of the said actuator (1, 1a, 1b, 1c) in order, on the one hand, to close the slide chamber (5) and, on the other hand, to secure the depressurization of the combustion chamber (3).

Abstract: A subject-matter of the present invention is a novel process for the synthesis of hexanitrohexaazaisowurtzitane (HNIW), a compound of use as energetic filler in powders, propellants and explosives. This process comprises a first stage of reaction of an ?,?-dicarbonyl derivative with a primary amine which makes it possible to form a hexasubstituted hexaazaisowurtzitane derivative. The HNIW is subsequently obtained directly, in a single reaction stage, by nitration of the hexasubstituted hexaazaisowurtzitane derivative. This process, in only 2 stages starting from a primary amine, is particularly simple and inexpensive.

Abstract: The present invention concerns a composition for a pyrotechnic compound that can be used as a thermal fuse in a gas generator comprising a pyrotechnic charge, said pyrotechnic compound having a self-ignition temperature that is lower than that of the pyrotechnic charge of the generator so as to be capable of initiating combustion of the pyrotechnic charge in the event of abnormal heating of the generator before said pyrotechnic charge reaches its self-ignition temperature. This composition is characterized in that it can be metered out and deposited in the form of an adhesive onto any appropriate support of the generator.

Abstract: The invention relates to a device for the electrical initiation of at least one pyrotechnic microcharge (3), this device being characterized in that it comprises a support element having at least one conductive finger (6) connected to a first terminal of a central control unit (8), a second terminal of said central control unit (8) being intended to be electrically connected to an electrically conductive support for the pyrotechnic microcharge (3). The invention also relates to a microactuator (1, 1a, . . . , 1h) and a microsystem (1?) that use such an initiation device.

Abstract: The present invention provides a pyrotechnic gas generating composition and pyrotechnic compounds able to be obtained from said composition. Said composition comprises basic copper nitrate, guanidine nitrate, a specific additional reducing charge, and/or a specific additional oxidizing charge as well as a specific binder.

Abstract: Described is a process and a plant for destroying rocket motors, including in particular the following steps and stations: cutting of the motor into sections; cooling of the sections containing propellant by immersion in a cryogenic liquid; and fragmenting and extraction of the cooled propellant by elastic deformation of the casing of the section. The propellant fragments are recovered for subsequent treatment and the casings are deactivated before being scrapped.

Abstract: Described is a process and a plant for destroying rocket motors, including in particular the following steps and stations: cutting of the motor into sections; cooling of the sections containing propellant by immersion in a cryogenic liquid; and fragmenting and extraction of the cooled propellant by elastic deformation of the casing of the section. The propellant fragments are recovered for subsequent treatment and the casings are deactivated before being scrapped.

Abstract: This set of equipment for a motor vehicle includes an inflatable structure, an element acting as a support for the inflatable structure, an element forming a load-spreading plate and at least one frangible member for fixing the load-spreading plate to the support. The set includes a sheath, an open first end which is fixed to the support and an open second end which is fixed to the load-spreading plate to form the inflatable structure. The frangible member includes a thin web, a peripheral region which is fixed to a first element, either the load-spreading plate or the support, and a central region which is fixed to the other of these elements.

Abstract: The invention relates to an electrically-opened micro fluid-valve. The inventive valve comprises: at least one planar support (12); at least one afferent microchannel (14); at least one efferent microchannel (16), said microchannels being arranged in the support (12); such that at least one of the ends (141 and 161) thereof touch the inner face (121) of the support close to one another; at least one deposit (18) of a heat-sensitive material which is disposed on the inner face (121) of the support (12); and at least one heating means (20). According to the invention, the aforementioned deposit (18) of heat-sensitive material at least partially seals the space separating the ends (141 and 161) of the microchannels (14 and 16), thereby preventing same from intercommunicating.