Downhole stimulation tools include a housing and at least one propellant structure within the housing comprising at least one propellant grain of a formulation, at least another propellant grain of a formulation different from the formulation of the at least one propellant grain longitudinally adjacent the at least one propellant grain, and at least one initiation element proximate at least one of the propellant grains. At least one pressure containment structure is secured to the housing and comprises a seal element expandable in response to gas pressure generated by combustion of a propellant grain of the at least one propellant structure. Related methods are also disclosed.

A high performance composite pyrotechnic product without lead in its composition, and that can be obtained on an industrial scale without encountering a problem of potlife for the intermediate paste, the product containing organic energetic charges and a combustion catalyst in a plasticized binder including a cured energetic polymer and at least one energetic plasticizer. In characteristic manner, the cured energetic polymer consists of a glycidyle azide polymer (GAP) having number average molecular weight (Mn) lying in the range 700 g/mol to 3000 g/mol, cured via its hydroxyl terminal functions with at least one curing agent of polyisocyanate type; and the combustion catalyst consists of bismuth citrate.

A solid rocket propellant includes a blended plasticizer of at least two chemically different 3-nitro 1,2,4-triazoles.

A composite pyrotechnic product containing energetic charges in a plasticized binder includes a cured energetic polymer and at least one energetic plasticizer, wherein: the cured energetic polymer consists of a glycidyl azide polymer (GAP) having a number average molecular weight (Mn) lying in the range 700 g/mol to 3000 g/mol and cured via its hydroxyl terminal functions with at least one curing agent of polyisocyanate type; and the energetic charges present at a content in the range 50% to 70% by weight consisting, for at least 95% of their weight, of large crystals of ammonium dinitramide (ADN) and of small crystals of hexogen (RDX): the large crystals of ammonium dinitramide (ADN) being present at a content in the range 8% to 65% by weight; and the small crystals of hexogen (RDX) being present at a content in the range 5% to 55% by weight.

A potted electronic device comprises an electronic device at least partially encapsulated by an energetic potting material. The energetic potting material comprises a halogenated urethane binder and a metal fuel dispersed within the halogenated urethane binder. Related energetic potting materials and methods of forming electronic devices at least partially encapsulated with the energetic potting materials are also disclosed.

A formulation for a composite propellant including an oxidant suspended or embedded in a binder matrix, and the binder matrix having a cured or partially cured binder precursor including two or more functional groups.

A method and compound includes mixing a salt compound to 2-butyne-1,4-diol in an alcohol to create a mixture; adding a solution of dichloroglyoxime in an alcohol to the mixture to create 3,3-bis-isoxazole-4,4,5,5-tetryltetramethanol; and nitrating the 3,3-bis-isoxazole-4,4,5,5-tetryltetramethanol to create 3,3-bis-isoxazole-4,4,5,5-tetrylbis(methylene) tetranitrate, which has the structural formula: ##STR00001##
The alcohol may include ethanol, wherein the adding may occur at 60 C., or alternatively the adding may occur at 80 C. The alcohol may include n-butanol, wherein the adding may occur at 100 C., or alternatively the adding may occur at 120 C. The mixing may occur at 120 C. The method may further include cooling the nitrated 3,3-bis-isoxazole-4,4,5,5-tetryltetramethanol to 0 C.; stirring the cooled nitrated 3,3-bis-isoxazole-4,4,5,5-tetryltetramethanol for at least four hours creating a precipitate; warming the precipitate; pouring the precipitate onto ice while stirring creating a solid material; collecting the solid material; and drying the solid material to yield the 3,3-bis-isoxazole-4,4,5,5-tetrylbis(methylene) tetranitrate.

A solid rocket motor includes a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant. The second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant.

Solid-fuel rocket propellants comprising an oxidizer, an oxophilic metal-halophilic metal formulation, and a binder are described herein. Further described are processes for preparing such propellants and methods of reducing hydrogen chloride production via the combustion of such propellants. Non-limiting examples of such formulations include aluminum-lithium alloys.

The invention relates to Insensitive Munition (IM) energetic materials particularly IM propellant compositions, and yet further to nitrocellulose-free IM propellants. An energetic composition suitable for use as a propellant comprises the following components in the following relative proportions: component A; from 5% to 25% by weight of an IM energetic filler; component B: from 50% to 80% by weight of a highly energetic filler comprising at least one nitramine compound; component C of from 5% to 20% by weight of a binder; and component D of from 3% to 15% by weight of a plasticizer; the percentages by weight of components A, B, C and D together with minor additives, if any, adding to 100%.