China Aerospace Fuel a-Alpha Aluminum Rockect Fuel Missile Fuel Military Special Energy Materials Fuel Cell Bomb Material

alpha aluminum hydride α-aluminum hydride AlH3
As a fuel product of high-energy solid propellant, solid-liquid propellant and liquid propellant, α-aluminum hydride can be widely used in vehicle power fuel cell systems, aerospace fuels, military special energy materials, medicine, pesticides and other industries. At present, aluminum hydride often has problems such as unstable crystal form, easy decomposition, uneven particle size distribution, many holes and cracks, low hydrogen content, and complex preparation processes, which limit its wide application. Therefore, high-quality aluminum hydride (particle size The preparation method of uniformity, few surface defects, complete structure, stable crystal form, etc.) is the key to solving the problem.
Our company's α-aluminum hydride is a gray or off-white granular powder. This compound contains a lot of light, stable and long-lasting energy in the form of hydrogen. As a fuel product of high-energy solid propellant, solid-liquid propellant and liquid propellant, α-aluminum hydride can be widely used in vehicle power fuel cell systems, aerospace fuel booster fuel, medicine, pesticides and other industries. This kind of hydrogen storage energy-containing material is a new product with broad development prospects.
Application of α-aluminum hydride
1. Application as hydrogen storage materials in batteries or fuel cells (new energy materials)
Alpha-aluminum hydride itself contains hydrogen that is denser than liquid hydrogen, so it is very suitable as a hydrogen source for batteries or fuel cells. Graetz et al. found that the decomposition rate of 100 kg of pure α- and β-α-aluminum hydride with a particle size of 200 nm at a temperature above 115 ºC and 0.2 MPa is 1g H2/s, which has reached the US Department of Energy (DOE) Performance index of 50 kW fuel cell.
In fuel cell vehicles, hydrogen fuel and oxygen flow into the fuel cell stack to produce electricity to drive the engine. The by-product is only water, which does not emit greenhouse gases. This is the most ideal way in the field of green vehicles. Currently, α-aluminum hydride is the most ideal hydrogen storage material for fuel cells.
In summary, it can be found that the synthesis of α-aluminum hydride begins with the need for reducing agents in synthetic organic chemistry. The development of hydrogen storage materials has promoted its further development. As the next generation of metal combustion agents, this application prospect must Will usher in more in-depth and extensive research on α-aluminum hydride. It seems that α-aluminum hydride is particularly suitable for use in energetic materials.
2. Application in solid rocket composite solid propellant and energetic materials (explosives)
Solid propellant is the power source material of solid rocket motor and plays an important role in the development of missile and aerospace technology. At present, due to the good performance of the composite propellant, the wide operating temperature range, and the higher energy, its theoretical specific impulse is 2205-2697 N·s/kg. Most solid rockets in various countries use composite solid propellants. metal powder fuel (such as aluminum powder, magnesium powder, etc.) is one of the important components widely used in composite solid propellants that can effectively improve the specific impulse of the propellant system, and its mass content accounts for about 18% of the entire propellant component content. . Therefore, choosing a higher energy fuel to replace the existing metal powder fuel is one of the effective ways to increase the propellant energy. At present, the fuel used in solid propellant formulations is mainly aluminum powder. Compared with aluminum powder, α-aluminum hydride has the advantages of higher combustion heat and gas generation. It can be used as high-energy solid propellant, solid-liquid propellant and Liquid propellant fuel. Alpha-aluminum hydride is a substance composed of two strong reducing atoms. The combustion process of alpha-aluminum hydride has high-energy characteristics. Hydrogen is produced during the combustion of propellant. Hydrogen can promote the rapid combustion of oxidant to produce xo and H2O. And release a lot of heat. In solid propellants, such as α-aluminum hydride instead of Al powder, the specific impulse of the propellant can be significantly increased, and the ignition and combustion performance of the propellant can be improved. It is an ideal choice for the metal combustion agent in the composite solid propellant. The thermodynamic calculation results of the composite solid propellant show that if the Al in the original composite solid propellant is replaced with a corresponding amount of gas H2, the flame temperature of the composite solid propellant will decrease and the average molecular weight of the combustion products will decrease. By comparing the formulas AP/HTPB/Al and AP/HTPB/α-aluminum hydride, it is found that the use of α-aluminum hydride can increase the standard specific impulse of the composite solid propellant by 20 s, but due to the low density of α-aluminum hydride, The density specific impulse of the composite solid propellant is reduced. When α-aluminum hydride is used in composite solid propellants, it has good compatibility and can be used with ammonium nitrate, dinitroaniline, potassium nitrate, ammonium perchlorate, sodium peroxide, raccoon, and octo Gold, CL-20 and other oxidants, and polyethylene glycol, azide glycidyl ether, nitroglycidyl ether, hydroxyl-terminated polybutadiene and other binders, and can be combined with aluminum, beryllium, boron, magnesium, zirconium, etc. Use with metal burning agent. Since many components of solid propellants are the same as explosives, their application in explosives can be used for reference.
3. Application as addition polymerization catalyst in polymer synthesis chemistry
In the field of polymer synthesis, α-aluminum hydride has been widely used as a polymer polymerization catalyst. Mainly for addition polymerization reactions, such as polymerization reactions of ethylene, propylene, styrene and methyl methacrylate. If necessary, α-aluminum hydride can be combined with other additives, pigments, antioxidants, lubricants and plasticizers And so on. The polymerization environment of the polymerization reaction can be a solution, a polymerization system with a high viscosity, or a gas phase. α-Aluminum hydride is often used as a polymerization catalyst in the form of a complex.
4. Application as a reducing agent in synthetic organic chemistry
When α-aluminum hydride decomposes, it can release atomic H, so it has strong reducibility and can be used to reduce unsaturated C-C bond organic compounds, such as alkenes and alkynes. At the same time, it can also be used to reduce ketone, aldehyde, carbonyl and ester groups. In the field of organic synthetic chemistry, α-aluminum hydride is a reducing agent with high reduction efficiency and strong reducibility, which greatly enriches the molecular design and synthesis routes of complex molecular structure organic compounds, thus making many complex molecular structures. The synthesis of organic compounds becomes possible. For the reduction of organic phosphorus and organic sulfur unsaturated compounds, α-aluminum hydride also has a good effect. Reduce ethyl diphenyl phosphate to ethyl diphenyl phosphite with α-aluminum hydride in tetrahydrofuran. The amount of α-aluminum hydride is 1.1% (mass) of ethyl diphenyl phosphite, and the reaction yield is Up to 98%, and the reaction conditions are mild and easy to operate. If the ethyl diphenyl phosphate in the above reaction is replaced with diphenyl sulfoxide, other raw materials and reaction conditions remain unchanged, and the yield of the reduction reaction is as high as 96%.
5. As the precursor of aluminum film in atomic layer deposition technology
Atomic Layer Deposition (ALD) technology can accurately control the thickness and composition of the film, while the deposited film has uniform thickness, high purity, and good conformability. In recent years, it has been widely used in many fields such as semiconductor integrated circuits. Al2O3 has always been an ideal surface film material. To prepare Al2O3 film, there must be a good Al precursor. α-Aluminum hydride and (N(CH3)2(C2H5)) complex (DMEAA) is a good precursor for preparing Al2O3 film in atomic layer deposition technology, and its comprehensive performance is better than the commonly used precursor Such as AlCl3, Al(CH3)3 and Al(CH3)2Cl and so on. Jeong et al. obtained the Al film by plasma assisted atomic layer deposition (PAALD) and then oxidized it, and obtained a high-quality Al film with a thickness of 15 nm and a refractive index of 1.68 on the silicon surface.
Main technical indicators of α-aluminum hydride products:
CAS Number: 7784-21-6
1. Appearance: gray or off-white granular powder
2. Crystal form: cubic crystal
3. Density: 1.47~1.48(g/cm3)
4. Content of a-AlH3: ≥98%
5. Particle size range: 5~1000μm (can be customized according to user requirements)
Molecular formula: a-AlH3
1.Appearance: Gray-white granular powder
2.Crystal type: cubic crystal
3.Density: 1.47~1.48(g/cm3)
4.Content ofa-AlH3: ≥98%
5.Particle size range: 5~1000μm