At present, china use low temperature rapid reaction, self-propagating high temperature reduction, combustion synthesis technology to prepare ultrafine high purity boron powder.
For rocket solid fuel, nuclear reactor control rods, explosives the catalyst, automotive airbag triggered agent, boron-containing superconductors, high-quality special steel and other defense industry.
Elemental boron fiber and composite materials: It is reported that the high-strength boron fibers produced by boron fiber manufacturers, high melting point, light weight, good thermal stability. Its strength is 3 times of steel. The E modulus is almost equal. And the weight is only 1/40 of the steel. As the metal powder supplier predict, the era of boron fiber instead of carbon fiber and titanium alloy is coming. An epoxy resin or a polyamide resin as a boron fiber composite material of the base body and metallic aluminum, titanium, cobalt, boron-containing fibers of the matrix material also has good performance. Boron nitride fiber modulus and high functional fibers, high-temperature structural materials can be used as aerospace. The non-metallic borides apply in the field of aerospace defense are boron carbide, boron nitride, and phosphide boron and its composite.
1. Boron carbide, the hardness of boron carbide is only second to diamond and cubic boron nitride. Because of its high strength, high hardness, low density, good wear resistance and chemical properties of stable and neutron absorption properties, it have a wide range of applications in the aerospace, military protection, nuclear power plants, machinery and chemical industry. Because of its hard cast military can protect board for warships, tanks, armored vehicles, bulletproof layer. Its light and hard coated can paint on the aircraft, submarines, or on the vehicle brakes to make it more robust. Also be used as a lightweight body armor, bulletproof vests, or coated on the jewelry and watches to prevent them from being worn. For spacecraft because of its high wear resistance, mechanical seals clever submarines. Its neutron absorption feature can be used for nuclear shielding materials and nuclear reactor core block.
2. Boron nitride, boron nitride is inorganic polymers. Different crystal structure, it has three allotrope: hexagonal boron nitride, close-packed hexagonal boron nitride, cubic boron nitride. Hexagonal boron nitride has the same crystal structure and graphite, commonly known as white graphite. Hardness (Mohs) 2.0; 3000 ~~ sublimation; 3300 ~ 3400 melting. The high temperature wear resistance of HBN is excellent, a graphite more resistant to heat than the solid, corrosion resistance, thermal stability is better than diamond, and good dielectric insulating properties and high thermal conductivity. Through microwave and infrared light, radiation-resistant, has a strong neutron absorption capacity, and therefore can be used as a high-temperature electrical insulation materials in the field of aerospace defense, anti-neutron shielding material, the radar the transfer window, the radar antenna medium and rocket engine group and other items.
3. Phosphide Boron, phosphide Boron is also a super-hard, anti-wear, heat-resistant, corrosion-resistant of new inorganic materials. Preparation method: phosphine method, boron trichloride, iodide, boron, the metal phosphide method and the metal flux method. Because of its different system of law, can present as dark red crystals, brown or gel form. Phosphide Boron has chemical stability and strong resistance to oxidation and corrosion resistance, insoluble in acid and organic solvents. Hardness than SiC, the structure has a large energy gap, in the air of 800 to 1000 ° C can not oxidize. Can be used for high-temperature semiconductors, synthetic gem materials; can also be used for optical instruments, precision instruments, be applied in the field of defense high-tech.
The metal boride is formed of boron and titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, lanthanum, iron and so on, generally referred to as the metal-type boride. Their common features of having a metallic luster and can be electrically and thermally conductive, high melting point, hardness, but brittle. The metal borides applied to the field of aerospace defense are lanthanum boride, titanium boride, zirconium boride, chromium boride, calcium boride, NdFeB and so on.
Source:http://www.mhcmp.com
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Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
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Nano-aluminum powder, a material with remarkable properties due to its minuscule particle size, is revolutionizing various industries with its high reactivity and large specific surface area. Unlike its bulk counterpart, nano-aluminum powder begins to oxidize at a lower temperature of 550°C, compared to the 950°C oxidation point of ordinary aluminum. This lower ignition energy and full combustion without apparent cohesion make it a superior choice for applications requiring high energy and efficiency. The unique characteristics of nano-aluminum powder, such as faster burning rates and greater heat release, are largely influenced by its synthesis method, which determines its particle size, surface area, and shape.
