Abstract: This molded steel alloy includes the following elements in weight percent: carbon (C) between 0.08% and 0.4%, silicon (Si) between 0.15% and 2%, nickel (Ni) between 24% and 31%, cobalt (Co) between 15% and 30%, and niobium (Nb) between 0.01% and 2.5%. The composition also includes an additional element selected from a group consisting of: molybdenum (Mo) at a content of less than or equal to 3% by weight, manganese (Mn) at a content of less than or equal to 1.5% by weight, chromium (Cr) at a content of less than or equal to 1.5% by weight, phosphorus (P) at a content of less than or equal to 0.04% by weight, sulfur (S) at a content of less than or equal to 0.03% by weight, copper (Cu) at a content of less than or equal to 0.5% by weight, iron, and unavoidable impurities.

Abstract: The invention relates to a method and to an autonomous device (10d) for injecting a fluid (F), that uses pyrotechnical means (1d). The invention can be used in particular for injecting a protection fluid (F) into a system that is subject to overheating (8d). The method is characterized in that it uses a thermally triggered charge (1d).

Abstract: The invention relates to a method and to an autonomous device (10d) for injecting a fluid (F), that uses pyrotechnical means (1d). The invention can be used in particular for injecting a protection fluid (F) into a system that is subject to overheating (8d). The method is characterised in that it uses a thermally triggered charge (1d).

Abstract: The fuel cell (2) is of the kind comprising an anode (12) and a cathode (10) between which an electrolyte (18) is interposed. Solid bodies (20) storing a hydrogen mass, able to be decomposed by combustion, are associated to pyrotechnic means (24,26) to release the hydrogen and bring it into contact with the anode (12). Means (38) tap the ambient air to bring it into contact with the cathode (10). Firing of the pyrotechnic means (24,26) is placed under the control of addressing means (28) embedded in the appliance (2). The surplus water produced by the exchange between the hydrogen and the oxygen is resorbed by the temperature increase induced by combustion of the bodies (20). The solid bodies (20) are supported by an interchangeable card (22).

Abstract: The invention relates to solid compositions that can decompose generating hydrogen in a self-sustaining combustion reaction after this reaction has been initiated by an appropriate heat source. These compositions comprise an alkali metal borohydride and an oxidizing mineral ammonium salt of formula NH4Y, in which Y represents a group consisting only of nitrogen and oxygen. The ratio of the weight content of alkali metal borohydride to the weight content of the salt of general formula NH4Y is between 1 and 4. Thus, high hydrogen mass yields are obtained, of around 8 to 14%, thereby making it possible to reduce the size and the weight of the hydrogen generators used in certain systems, especially in proton exchange membrane fuel cells.