Abstract: The invention concerns the technical field of micro-actuators used for mechanical, chemical, electrical or thermal functions in microsystems, for microelectronic applications such as chips, or biomedical functions such as microfluidics integrating cards. The invention concerns a micro-actuator comprising a so-called main chamber, made in a solid support and containing a so-called main pyrotechnic charge, the main chamber being sealed and delimited by solid support walls and by a deformable membrane, such that the gases emitted by the combustion of the main pyrotechnic charge, enable the volume of the chamber to be increased by deforming the membrane while maintaining intact the solid walls of the main chamber. The invention is characterized in that it comprises means for evacuating the gases from the main chamber.

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.

Abstract: The invention relates to a solid composition which can decompose with the generation of hydrogen according to a self-sustaining combustion reaction after initiation of this reaction by an appropriate heat source, this composition being characterized in that it comprises an alkali metal borohydride or alkaline earth metal borohydride and a perchlorate-based oxidizing salt corresponding to the general formula SClO4 in which X represents the NH4 group, an alkali metal or an alkaline earth metal.

Abstract: The present invention relates to an electrically openable microfluidic valve, which comprises: at least one plane support (12); at least one afferent microchannel (14); at least one efferent microchannel (16); said microchannels being provided in the support, so that at least one of their ends (141) and (161) opens onto the internal face (121) of said support (12), near one another; at least one deposit (18) of a heat-sensitive material laid out on the internal face (121) of the support (12); and at least one heating means (20); so that the deposit (18) of heat-sensitive material at least partly closes off the space separating the ends (141) and (161) of the microchannels (14) and (16), thus preventing the latter from communicating with one another; the increase in temperature by the heating means (20) resulting in a modification of the structure of the heat-sensitive material, thus at least partially clearing the ends of the microchannels and the space between the latter, so as to allow communicati

Abstract: The invention concerns the field of ammunitions equipped with their fuze, found on the battlefield. Such ammunitions represent a major pyrotechnic risk. The problem consists in destroying the fuze so as to be able to dismantle said ammunition. The method consists in placing said ammunition (1) in a closed chamber (5) to carry out at least once the following cycle: depressurizing the chamber (5), dissolving the fuze (2) of the ammunition (1) with a liquid corrosive agent, drawing off the gaseous effluents towards an auxiliary chamber (7), reopening the chamber (5) after dissolving the fuze (2), removing the ammunition (1), recovering the mixture resulting from the attack of the fuze (2) by the liquid corrosive agent (6) and treating it by pyrolysis.

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: A process for the monomethylation of nitrogenous heterocycles having at least one nitrogen atom bonded to a hydrogen atom by reacting the nitrogenous heterocycle with dimethyl carbonate at a temperature of between 100° and 200° C. and a pressure of between 0.93×105 Pa and 1.07×105 Pa while methanol produced during the reaction is distilled off as it is formed.

Abstract: The technical field of the invention is that of microactuators designed for mechanical, chemical, electrical or thermal functions in microsystems, for microelectronic applications such as chips, or biomedical applications such as cards incorporating microfluidics. The invention concerns a microactuator comprising a chamber machined in a solid support and containing a pyrotechnic charge. Said microactuator is essentially characterised in that the chamber is partly delimited by a deformable membrane, such that the gases emitted by combustion of the pyrotechnic charge enable to increase the volume of said chamber by deforming said membrane while maintaining intact the solid walls of the chamber.

Abstract: A process for casting propellant paste into a mould to manufacture a block of solid propellant includes first mixing two groups of components briefly at low pressure, mixing the two groups of components at high pressure, and casting the mixture in a mould. The first group of components represents about 80% to about 99% of the finished product and essentially comprises a liquid prepolymer, at least one pulverulent solid charge and some of the various additives of the propellant paste. The second group of components represents about 20% to about 1% of the finished product and comprises the crosslinking agent and the rest of the additives.

Abstract: A process for casting propellant paste into a mould to manufacture a block of solid propellant includes first mixing two groups of components briefly at low pressure, mixing the two groups of components at high pressure, and casting the mixture in a mould. The first group of components represents about 80% to about 99% of the finished product and essentially comprises a liquid prepolymer, at least one pulverulent solid charge and some of the various additives of the propellant paste. The second group of components represents about 20% to about 1% of the finished product and comprises the crosslinking agent and the rest of the additives.

Abstract: In the military field of explosive munitions, a semi-continuous process produces a composite explosive charge comprising a charged solid polyurethane matrix, the charge of which is pulverulent and comprises at least one nitro-organic explosive, by introduction into a mould of a pastry explosive composition and then thermal crosslinking of this composition. The composition is obtained by mixing constituents essentially comprising a polyol prepolymer, a plasticizer, a polyisocyanate monomer and a pulverulent solid charge comprising at least one nitro-organic explosive. This simple and economic process makes it possible to dispense, without disadvantage, with the pot life/curing time of the composition compromise.

Abstract: The present invention relates to a gas-generating pyrotechnic composition, this composition being characterized in that it comprises a first oxidizing charge consisting of ammonium perchlorate and a second oxidizing charge consisting of a metal oxide chosen from the group consisting of copper oxide, manganese oxide and a mixture of these two compounds, the weight ratio between the first oxidizing charge and the second oxidizing charge being less than 1, the said composition also including a reducing charge in the form of a nitrogen-containing organic compound chosen from the group consisting of nitroguanidine, guanidinium nitrate, oxamide, dicyandiamide and metal cyanamides.

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.

Abstract: The invention is directed to a solvent-free gas-generating pyrotechnic composition, and a method for continuously manufacturing the composition in a twin-screw mixer-extruder, the composition including a binder, a nitrogenous organic compound, an oxidizing filler, and optionally at least one additive; the oxidizing filler including an ammonium perchlorate and a chlorine scavenger; the binder including at least one polymer, having a molecular mass greater than 200,000 and selected from a polyester polymer and an acrylic ester, and wherein the binder uncliding at least one liquid constituent selected from a polyester resin and a plasticizer.

Abstract: The invention relates to a process for the synthesis of aryl alkyl monoethers by reaction of a phenol compound, comprising one or more hydroxyl groups attached to the aromatic system, and of a dialkyl carbonate. It is a solvent-free process carried out at a pressure of between 0.93×105 Pa and 1.07×105 Pa, at a temperature of between 100° C. and 200° C., and in the presence of a catalyst chosen from the group consisting of alkaline carbonates and alkaline hydroxides. The dialkyl carbonate is added gradually to the reaction mixture.

Abstract: The invention concerns a protective assembly (1, 101) for the lower limbs (31) of a motor vehicle passenger comprising an actuating device (2, 103) secured to the vehicle and capable of displacing a rod (3, 108) which is linked to a protective system. The invention is characterized in that: i) the actuating device contains a pyrotechnic system (9); ii) the protective system comprises a protective cushion (6) mounted on a shaft (5, 105) integral with the vehicle; iii) said protective cushion is mobile in rotation under the effect of the displacement of the rod so as to accompany, in the contact zone provided between the passenger's lower limbs and said protective cushion, the movement of said lower limbs.

Abstract: This set of equipment (1) for a motor vehicle comprises an inflatable structure (2), an element (4) acting as a support for the inflatable structure, an element (8) forming a load-spreading plate and at least one frangible member (10) for fixing the load-spreading plate to the support.

Abstract: The invention relates to a solid composition which can decompose with the generation of hydrogen according to a self-sustaining combustion reaction after initiation of this reaction by an appropriate heat source, this composition being characterized in that it comprises an alkali metal borohydride or alkaline earth metal borohydride and a perchlorate-based oxidizing salt corresponding to the general formula XClO4 in which X represents the NH4 group, an alkali metal or an alkaline earth metal.

Abstract: The invention relates to a solid composition which can decompose with the generation of hydrogen according to a self-sustaining combustion reaction after initiation of this reaction by an appropriate heat source, this composition being characterized in that it comprises an alkali metal borohydride or alkaline earth metal borohydride and strontium nitrate Sr(NO3)2.

Abstract: The invention relates to a process for the preparation of N,N′-carbonylbislactams by reaction of phosgene with at least one lactam which is characterized in that the tertiary amine is chosen from the group consisting of non-nucleophilic aliphatic tertiary amines. N,N′-Carbonylbislactams of high purity are thus obtained with good yields, both in the laboratory and on the industrial scale.