137results about "Pressure gas generation" patented technology

Emulsion explosives with gas bubbles that are resistant to in-borehole migration or coalescence are disclosed herein. Such emulsions can be sensitized by mechanically-introducing gas bubbles into the emulsion. Resistance to gas bubble migration and coalescence can be achieved by homogenization, without the need for bubble stabilization agents.

The invention belongs to the technical field of solid propellants, and particularly relates to a propellant containing active metal fuel and a preparation method of the propellant. 3.0-4.0% of a plasticizer; 0.3-0.4% of a curing agent; 0.1%-2.0% of a combustion rate regulator; 0.01%-0.5% of a bonding agent; 15-19% of an active metal fuel; 10-18% of a nitramine explosive; the metal fuel is an aluminum-gallium metal alloy, and the aluminum-gallium metal alloy is an aluminum-gallium metal alloy of which the outer layer is coated with an aluminum film. The propellant provided by the invention has the advantage of high combustion efficiency, and can meet the requirement of a solid rocket engine on the high energy performance of the propellant.

The invention discloses application of ferrocenyl conjugated microporous polymers Fc-CMPs in a composite solid propellant and the composite solid propellant, the ferrocenyl conjugated microporous polymers Fc-CMPs are porous organic polymers which take ferrocenyl groups as conjugated functional units and are connected through covalent acetylenic bonds, and the ferrocenyl conjugated microporous polymers Fc-CMPs have excellent thermal stability and permanent porosity, and can be used for preparing the composite solid propellant. The material is solid powder, is insoluble in a traditional organic solvent and does not migrate, and a ferrocene unit serves as a constituent part of a polymer framework and an oxidation-reduction active site and is dispersed in a two-dimensional conjugated network structure of a composite solid propellant. When being used as a burning rate catalyst to be applied to AP decomposition, the ferrocene burning rate catalyst can obviously reduce the high-temperature decomposition peak temperature of AP, and solves the migration problem of a traditional ferrocene burning rate catalyst in a composite solid propellant system. The Fc-CMPs are applied to an AP decomposition catalysis scene for the first time, and a new direction is provided for development of a composite solid propellant burning rate catalyst.

Provided is a gas-generating agent composition containing components (a) to (c) below, wherein a combustion temperature calculated based on a composition containing the components (a) to (c) below is 1680 K or higher: (a) guanidine nitrate, (b) basic copper nitrate, and (c) melamine cyanurate.

The invention relates to a composite solid propellant comprising: - a crosslinked polyurethane binder, which is the reaction product of a polyol polymer and a polyisocyanate crosslinking agent, in the presence of a crosslinking catalyst; - ammonium perchlorate; - optionally aluminum; - optionally a ballistic catalyst; - at least one additive comprising a functionalized organic compound comprising 30 to 50 carbon atoms. Figure for the abstract: Fig. 1.

The invention relates to the technical field of gas production materials, and discloses preparation and application of a high-nitrogen energetic gas production material, triazole has high-energy and multi-nitrogen characteristics, nitryl compounds have high energy, and the combination of triazole and nitryl compounds enables the gas production material to have the characteristics of large gas production rate, low-temperature combustion, less harmful gas and the like; the molecular structure contains a large number of N-N, C-N and C = N bonds and has high enthalpy of formation, meanwhile, the content of C and H in the molecule is low, the density of the energetic material can be improved, the electronegativity of nitrogen and oxygen atoms in the structure is high, and the energetic material is a painful energetic material and has high safety in the using process; compared with similar gas production materials, the prepared gas production material has the advantages that the gas production rate is greatly increased, the amount of solid residues is greatly reduced, the added adhesive has no corrosivity, the prepared gas production material is good in fluidity, the external additive can play a role in slagging, and the residues are not prone to being sprayed out.

This invention provides a three-layer composite fuel consisting of boron-supported elemental metal and metal oxide, and its preparation method. The middle layer is an elemental Mo layer, and the surface layer is a dense NbOx or TiO2 thin film oxide layer. The NbOx or TiO2 thin film oxide layer can completely cover the elemental Mo layer. This invention uses atomic layer deposition (ALD) to deposit elemental Mo on the surface of boron particles to prepare a B@Mo composite material. To prevent oxidation of the surface Mo, an in-situ preparation method is used to deposit a dense NbOx or TiO2 thin film of a certain thickness on the Mo film surface via ALD. This NbOx and TiO2 film effectively isolates oxygen from the air, effectively preventing the oxidation of the Mo film. In the composite fuel, elemental Mo not only improves the combustion efficiency of boron particles but also effectively increases the heat release of the composite fuel. The NbOx and TiO2 films not only isolate oxygen but also have a catalytic effect, significantly improving the combustion performance of the composite fuel.

The application discloses a synthesis method of aza-cyclic modified hydroxyalkyl diethanolamine borate linking agent, which comprises the following steps: (1) adding hydroxyalkyl diethanolamine and boric acid into a three-neck flask provided with a stirrer, a thermometer and a vacuum distillation device, and stirring and heating to react until no water is generated; (2) adding an aza-cyclic compound into the reaction system obtained in the step (1), increasing the reaction temperature, and removing water generated in the reaction by vacuum distillation when no water vapor is generated, so as to obtain a target product. The borate linking agent obtained by the synthesis method has good hydrolysis resistance, and when the borate linking agent is used in a hydroxyl-terminated solid propellant, the mechanical properties of the hydroxyl-terminated solid propellant can be effectively improved.

The invention relates to the technical field of energetic materials, in particular to nickel fluoride catalyzed ammonium perchlorate / aluminum composite fuel and a preparation method and application thereof. The ammonium perchlorate / aluminum composite fuel consists of the following components in percentage by mass: 50-70% of ammonium perchlorate, 0-10% of nickel fluoride and the balance of aluminum powder. Due to the addition of NiF2, high and low decomposition peaks of AP are combined into a violent exothermic peak, and the temperature of the high-temperature decomposition peak is reduced by about 30 DEG C, which means that the burning rate of the propellant can be greatly improved; the heat effect of the fluorination reaction (55.98 kJ. G <-1 >) of aluminum is far higher than the heat effect of the oxidation reaction (31.05 kJ. G <-1 >) of aluminum, so that the explosion heat is improved by about 10% while the reaction path is optimized. Besides, the anhydrous NiF2 used in the formula is stable in physical and chemical properties and does not absorb moisture and deliquesce, the problem of long-term storage of common fluorides such as CuF2 and FeF3 is solved, and the product reliability is extremely high.

The invention discloses a composite propellant containing a high-nitrogen ferrocene derivative and a preparation method of the composite propellant. The composite propellant is prepared from the following components: 14.05% of hydroxyl-terminated polybutadiene (HTPB), 7.03% of diisooctyl sebacate (DOS), 0.92% of 2, 4-toluene diisocyanate (TDI), 1% of the high-nitrogen ferrocene derivative, 59% of ammonium perchlorate (AP) and 18.00% of aluminum powder (Al). N, N-dimethylaminomethylferrocene in the three high-nitrogen ferrocene derivatives has the effects of improving the burning rate of the composite propellant and reducing the pressure index as the ferrocene derivative, nitrate, picric acid, 3-nitro-1, 2, 4-triazole-5-ketone and the like are rich in C, H, O and N elements, and are similar to oxidizing agents such as typical components ammonium nitrate, HMD and the like in the composite propellant; the fuel can be decomposed to provide energy for propellant combustion; the propellant has a low combustion rate pressure index in a pressure range of 1-10 MPa, and has more excellent combustion stability.

The present invention relates to a composition comprising at least one amine selected from the group consisting of N,N,N',N'-tetramethylethylenediamine, N,N,N',N'-tetramethylpropylenediamine, 1,8-diazabicyclo[5.4.0]undec-7-ene, N,N-dimethylethylenediamine, 4-methylmorpholine, dimethyl-(2-azidoethyl)amine and mixtures thereof; at least one organic solvent selected from the group consisting of acetonitrile, dimethyl isosorbide, acetone, and mixtures thereof; and at least one carboxylic or sulfate salt of a transition metal; wherein the transition metal is completely dissolved in the composition. The invention also relates to hypergolic compositions and uses thereof.

The invention discloses aluminum-based powder fuel with a grain boundary oxygen vacancy channel and a preparation method and application of the aluminum-based powder fuel, and particularly relates to the technical field of metal fuel and aluminum-based alloy powder fuel. The method comprises the following steps: heating and melting pure aluminum to form an aluminum melt; then, Al-RE intermediate alloy is added into the aluminum melt, and the total content of the rare earth element RE in the melt is adjusted to be 0.1-7 wt%; and finally, the uniformly mixed melt is subjected to controlled supersonic atomization and rapid solidification, and the aluminum-based alloy powder is obtained. According to the invention, after powder combustion, a rare earth oxide channel rich in oxygen vacancy defects is constructed at a crystal boundary, and then oxidative combustion is further promoted. Lattice distortion and in-situ solid solution of boron atoms are caused by the radius difference of double rare earth (Ce / La) atoms, so that the formation energy of oxygen vacancies is greatly reduced. In the combustion process, high-concentration oxygen vacancies form a high-speed oxygen transmission channel, barrier of a compact oxidation film is broken, oxygen can rapidly permeate into particle cores, and the burn-off rate and energy release efficiency of aluminum powder are remarkably improved.

The present invention relates to a composition comprising at least one amine selected from the group consisting of N,N,N',N'-tetramethylethylenediamine, N,N,N',N'- tetramethylpropylenediamine, 1,8-diazabicyclo[5.4.0]undec-7-ene, N,N- dimethylethylenediamine, 4-methylmorpholine, dimethyl-(2-azidoethyl)amine and mixtures thereof; at least one organic solvent selected from the group consisting of acetonitrile, dimethyl isosorbide, acetone, dimethylsulfoxide, and mixtures thereof; and at least one carboxylic, nitrate, or sulfate salt of a transition metal; wherein the transition metal is completely dissolved in the composition. The invention also relates to hypergolic compositions and uses thereof.

The application discloses a ferrocenyl diamine monomer, a polyimide and a preparation method and application thereof, the ferrocenyl diamine monomer is prepared by reacting a ferrocene carbonyl compound with aniline, so as to introduce a ferrocene structural unit into the diamine monomer, and form a novel ferrocenyl diamine monomer for preparing the polyimide; the ferrocenyl diamine monomer is polymerized with a tetracarboxylic dianhydride and is subjected to an imidization reaction to prepare the polyimide, and the polyimide is used as a burning rate catalyst; the polyimide can not only effectively ensure the ferrocene content, has good thermal stability, greatly reduce the high-temperature decomposition temperature of an oxidant, has a smaller influence on the low-temperature decomposition temperature, and can significantly reduce the migration rate, effectively improve the performance of the ferrocene polymer burning rate catalyst, and is beneficial to the use safety.

A method of treating a subterranean formation by contacting the formation with the following (a) ammonium bicarbonate; (b) an oxidizing agent selected from a perchlorate or a nitrite or combinations thereof; and (c) an acid (AA).

The invention belongs to preparation of a flame inhibitor in the field of complex synthesis, and particularly relates to a potassium-containing bimetallic complex flame inhibitor as well as a preparation method and application thereof. The invention discloses a bimetallic complex with a chemical formula of [KPb2 (TATAB) 2] n. The invention discloses a preparation method of 2, 4, 5- The [KPb2 (TATAB) 2] n is prepared through a solvothermal method by using 2, 4, 6-tri (p-carboxylphenyl-amino)-1, 3, 5-triazine (H3TATAB), KOH and part of Pb salt as raw materials, and the complex has a three-dimensional metal organic framework structure, is relatively good in thermal stability and water stability, has a certain flame suppression effect after being mixed with a propellant, can be used as a flame suppressant in propellants, and can be used for preparing a flame suppressant for propellants. Good application prospects are realized in the field of propellants.

The invention discloses a large-size tin-phosphor bronze / Q235B composite plate and a preparation method thereof, and belongs to the field of material forming, the method comprises the following steps: by taking a Q235B steel plate as a base plate and a tin-phosphor bronze plate as a compound plate, sequentially laying a base plate, the Q235B steel plate, a support column, the tin-phosphor bronze plate, a protective layer, a fence structure, a low-detonation-velocity rock expanded ammonium nitrate fuel oil explosive layer and an inert layer on an explosion field from bottom to top, and forming the composite plate. And then the tin-phosphor bronze plate and the Q235B steel plate are subjected to metallurgical bonding after high-speed collision by detonating the explosive, the large-size tin-phosphor bronze / Q235B composite plate is obtained, the interface bonding rate of the obtained composite plate is larger than 98%, the interface shear strength exceeds 274 MPa, and the composite plate has the advantages of excellent high strength, wear resistance and the like of tin-phosphor bronze and low cost of Q235B steel.

The application discloses a kerosene gel propellant and a preparation method thereof, and belongs to the technical field of propellants. The propellant provided by the application comprises the following components in mass ratio: kerosene 37wt.%-68wt.%, modified boron 30wt.%-60wt.%, and gelling agent 2wt.%-5wt.%. The modified boron is halogen alkyl silane functionalized boron obtained by chemical combination of halogen alkyl silane and boron, and the halogen alkyl silane functionalized boron comprises a -B-O-Si- framework. The stable and controllable coating layer is obtained on the surface of boron particles by modifying the boron through halogen alkyl silane functionalization, and the higher content of boron particles is stabilized in kerosene. In addition, the high active halogen free radicals can be generated in the combustion process, the ignition and combustion of boron are accelerated, and the carbon deposition effect of kerosene hydrocarbons is reduced. The propellant has higher stability, excellent ignition performance and higher combustion efficiency.

A gas generant formulation for a side impact airbag is provided. The invention provides a gas generant formulation for a side impact airbag, comprising a primary fuel, a primary oxidizer, a secondary fuel, and a secondary oxidizer. The secondary fuel comprises at least melamine nitrate in an amount ranging from about 1.00% to about 10.00% by weight. The secondary oxidizer comprises at least potassium perchlorate in an amount ranging from about 1.00% to about 10.00% by weight. The formulation provides a burn velocity of at least 50 mm / sec at 40 MPa and a burn velocity slope of 0.40 or less.

The invention relates to a combustible propellant charge case for ammunition dischargeable from a gun barrel, comprising cellulose, nitrocellulose, MO3 particles, wherein M = Mo and / or W, and cationic surfactant, wherein the average particle size d50 of the MO3 particles is 0.5–2.0 µm, the maximum particle size d100 of the MO3 particles is ≤ 20 µm, and the quotient of the average MO3 concentration in wt.% in a volume element of approximately 0.05 to 1.0 cm3 (cVE) at any desired point in the propellant charge case and the total MO3 concentration in wt.% (ctot) in the propellant charge case is cVE:ctot = 0.80–0 1.20.

Described are inflation systems having an electric propellant device and an inflatable safety device. The electric propellant device may be configured to generate gas for the inflatable safety device, and the electric propellant device may include an electric propellant that is configured to be converted to gas by the electric propellant device using an electric current. The inflatable safety device may be positioned to receive the gas from the electric propellant device.

The application relates to the technical field of medicine column preparation, and discloses a medicine pressing automatic positioning column device, which comprises a base. The medicine pressing automatic positioning column device can drive the positioning column to move in the vertical direction through a lifting mechanism, thereby realizing accurate lifting of the positioning column, and cooperating with scale lines on the positioning column to realize real-time monitoring and feedback of the height position of the positioning column. The height of the positioning column can be automatically adjusted according to a preset medicine column height through an external control system. The movable limiting mechanism gradually contacts and is abutted by the positioning column to generate sliding displacement during the process of lowering the medicine under the driving of a hydraulic machine, the displacement of the movable limiting mechanism is controlled through a limiting adjusting assembly, the height is fixed during pressing, the movable limiting mechanism is moved in and out to adapt to the change of the pressing height caused by three times of charging, and then when different height medicine columns need to be pressed, different height positioning column devices need not to be replaced, so that the operation frequency is reduced and the medicine column preparation efficiency is improved.

To provide a gas-forming agent composition having a high combustion rate.SOLUTION: Provided is a gas-forming agent composition including the following components (a)-(d): (a) guanidine nitrate; (b) basic metal nitrate; (c) binder; and (d) basic magnesium carbonate, wherein (d) the basic magnesium carbonate has an average particle diameter of 12 μm or less.SELECTED DRAWING: None

The invention belongs to the technical field of propellants, and provides a boron-containing fuel-rich propellant and a preparation method thereof.The propellant adopts fluorine-containing composite boron powder to replace common boron powder; a combination of hydroxyl-terminated polybutadiene and hydroxyl-terminated poly (polyethylene glycol succinate) is adopted as an adhesive; hydroxyl-terminated polyethylene glycol terephthalate containing a benzene ring rigid structure is adopted as a reinforcing agent, a polyethylene glycol chain segment, epoxy resin on the surface of boron powder and an oxidizing agent form a hydrogen bond, and hydroxyl-terminated polyether ester fixes a solid filler in a curing network and adjusts the crosslinking density at the same time; chemical bonds are generated on the surfaces of filler particles, so that the modulus of the propellant is further improved; the perfluoro diacid diester is used as a plasticizer, so that the burning efficiency is improved while the processing property of the propellant is not influenced; ferric polyacrylate, 2, 4-dinitrophenoxy ethanol and the like are used as combustion regulators to promote efficient oxidation of the boron powder. The boron-containing fuel-rich propellant provided by the invention can solve the demand problem of a solid ramjet engine on a high-modulus boron-containing fuel-rich propellant.

The present invention provides an explosive composition containing at least one explosive and at least one heteroatom compound, the heteroatom compound including at least one type of heteroatom selected from the group consisting of B, P, Si, S, Cr, Sn, Al, Ge, Li, Na, K, Cs, Mg, Ca, Sr, Ba, Ti, Zr, V, Nb, Ta, Mo, W, Mn, Ni, Cu, Ag, Cd, Hg, Ga, In, Tl, As, Sb, Bi, Se, Te, Co, Xe, F, Y, and lanthanoids.

The application discloses an aluminum-based powder fuel with a grain boundary oxygen vacancy channel and a preparation method and application thereof, and particularly relates to the technical field of metal fuel and aluminum-based alloy powder fuel. The method comprises the following steps: heating and melting pure aluminum to form an aluminum melt; then adding an Al-RE intermediate alloy into the aluminum melt, and adjusting the total content of rare earth elements RE in the melt to be 0.1-7 wt%; finally, performing controlled supersonic atomization rapid solidification on the uniformly mixed melt to obtain an aluminum-based alloy powder. After the powder burns, a rare earth oxide channel rich in oxygen vacancy defects is constructed at the grain boundary, and the oxidation combustion is further promoted. The lattice distortion caused by the difference in atomic radii of double rare earth (Ce / La) and the in-situ solid solution of boron atoms greatly reduce the formation energy of oxygen vacancies. In the combustion process, high-concentration oxygen vacancies form a "high-speed oxygen transmission channel", break the barrier of the dense oxide film, and enable oxygen to quickly penetrate into the particle core, thereby significantly improving the burnout rate and energy release efficiency of the aluminum powder.

The invention discloses a solid rocket engine lining interface layer and a bonding method and application thereof, and relates to the technical field of lining interface bonding. The bonding method comprises the following steps: pre-coating bottom layer lining slurry on the surface of an object to be bonded, and pre-curing to form a pre-cured bottom layer lining; coating polymer powder on the surface of the pre-cured bottom lining layer, and completely curing the pre-cured bottom lining layer to form a cured lining layer; and the energetic hydrogel propellant thin slurry is poured on the surface of the curing lining layer, and the energetic hydrogel propellant thin slurry is cured. According to the method, interface bonding of the energetic hydrogel can be achieved through chemical bonding and mechanical embedding, the interface bonding strength is effectively improved, the bonding reliability of the charging interface of the hydrogel solid rocket engine is improved, and the bonding method has the advantages of being simple in step, convenient to operate, easy to implement, firm in bonding and the like.

The application discloses a large-size tin-phosphor bronze / Q235B composite plate and a preparation method thereof, and belongs to the field of material forming. The method uses a Q235B steel plate as a base plate and a tin-phosphor bronze plate as a composite plate, lays, from bottom to top, a backing plate, the Q235B steel plate, a supporting column, the tin-phosphor bronze plate, a protective layer, an enclosure structure, a low-explosive-speed rock expanded ammonium nitrate oil explosive layer and an inert layer on an explosion field, and then causes the tin-phosphor bronze plate and the Q235B steel plate to collide at a high speed by detonating the explosive, so that metallurgical combination is caused, a large-size tin-phosphor bronze / Q235B composite plate is obtained, the interface bonding rate of the obtained composite plate is greater than 98%, the interface shear strength is greater than 274 MPa, and the composite plate has the excellent high strength, wear resistance and other performances of the tin-phosphor bronze and the low-cost advantage of the Q235B steel.

A gas generant composition for passive inflatable restraint systems (e.g., airbags) for automobiles is provided that comprises a melamine oxalate compound. The gas generant may be a cool burning gas generant composition that comprises a melamine oxalate compound, a co-fuel, such as guanidine nitrate, and an oxidizer, such as basic copper nitrate. The gas generant composition has advantageous combustion properties, including a maximum flame temperature at combustion (Tc) of ≤about 1700K (1,427° C.), a linear burn rate of ≥about 18 mm per second at a pressure of about 10 megapascals (MPa), a gas yield of the gas generant composition of ≥about 5.7 moles / 100 cm3, and a linear burn rate pressure exponent of ≤about 0.35.

The present invention relates to a solid porous material for hydrogen gas generation, the material having a porosity of 20-75% by volume and a composition comprising, by weight of the material, 50-99% borohydride compound and 1-30% binder. Further aspects of the invention relate to gas generators comprising the material and its use in aerospace applications.