摘要:
An end-burning grain of a solid rocket motor or other gas-generating device is supplemented with one or more sticks of high-burn-rate propellant embedded in a matrix of a relatively low-burn-rate propellant. The sticks increase the burning surface area as the grain burns by forming conical indentations in the surface.
摘要:
A process for making a 1,3,5,7-tetraalkanoyl-1,3,5,7-tetraazacyclooctane comprises the steps of: (a) reacting a compound having the formula wherein R is straight chain or branched alkyl having 1-5 carbon atoms, with an alkanoic acid anhydride having the formula (RCO)2O, where R is as defined above, thereby producing a compound having the formula: wherein R is as defined above; and (b) reacting the compound having the formula (II) with the alkanoic acid anhydride in the presence of water and a catalytic amount of at least one transition metal oxide, thereby producing a compound having the formula where R is as defined above.
摘要:
The present invention relates to a manufactured graphene/metal or metalloid core-shell composite and manufacturing method thereof. The method comprising: using a modified graphene oxide as a base, then performing concentration and steam drying followed by organic solvent replacement to obtain a modified graphene oxide organic solvent; using a liquid-phase self-assembly method to coat the modified graphene oxide onto a surface of the metal or metalloid to form a graphene/metal or metalloid coated particle solution, then filtering and drying to obtain the graphene metal/metalloid core-shell composite. The method improves upon a conventional organic and inorganic material coating technique, and reduces an impact of a water-based solvent and high temperature on a highly reactive metal and metalloid, thereby expanding the feasibility of the coating technique and addressing a barrier of applicability of graphene and reactive metal or metalloid in the field of energetic materials.
摘要:
A process for forming granules (e.g., alpha-HMX containing granules) from at least one particulate material comprises the steps of: (a) selecting particulates (e.g., alpha-HMX particulates) having a particle size distribution; and (b) fluidizing the particulates, whereby particulates agglomerate to form granules. Optionally, the particulates can be coated with one or more second materials, such as energetic materials or fuels. If one or more of the second materials comprise polymerizable monomers, the process can optionally further comprise the step of polymerizing those monomers in situ, either before or after the granule is formed.
摘要:
A process for making alpha-HMX comprises the steps of: (a) combining phosphorus pentoxide and nitric acid at a temperature of about 0-25° C., forming a reaction mixture; and (b) adding a compound having the formula: wherein R is straight chain or branched alkyl having 1-5 carbon atoms, to the reaction mixture, whereby a product comprising alpha-HMX is produced.
摘要:
1. A method of preparing progressive-burning, multiple-base propellants comprising tumbling grains of propellant having a perforation through the length of the grain with a powder mixture consisting essentially of about 65 percent copper resinate and about 35 percent lead naphthenate by weight and then applying heat to said grains and powder mixture during tumbling to soften said powder mixture sufficiently to form a continuous, adherent coating on said grains.