It can greatly improve the performance of magnetic tape and large-capacity hard and floppy disks.
Magnetic fluid. Magnetic fluid made of iron, cobalt, nickel and their alloy powders has excellent properties.
, can be widely used in sealing shock absorption, medical equipment, sound adjustment, lighting display and so on.
Wave absorbing material. Metal nano-powder has a special absorption effect on electromagnetic waves. Iron, cobalt, zinc oxide powder and carbon-coated metal powder can be used as military high-performance millimeter wave stealth materials, visible-infrared stealth materials and structural stealth materials, as well as mobile phone radiation shielding materials. Surface conductive coating treatment of metals and nonmetals.
Efficient catalyst. Copper and its alloy nano-powders have high efficiency and strong selectivity as catalysts, and can be used as catalysts in the process of methanol synthesis from carbon dioxide and hydrogen.
Conductive adhesive Using nano-copper powder instead of precious metal powder to prepare electronic paste with superior performance can greatly reduce the cost. This technology can promote the further optimization of microelectronics technology. High performance magnetic recording materials. Using the advantages of nano-iron powder, such as high coercivity, high saturation magnetization (up to 1477 km2/kg), high signal-to-noise ratio and good oxidation resistance,
It can greatly improve the performance of magnetic tape and large-capacity hard and floppy disks.
Magnetic fluid. Magnetic fluid made of iron, cobalt, nickel and their alloy powders has excellent properties.
It can be widely used in sealing and damping, medical instruments, sound adjustment, lighting display and other fields.
Magnetic conductive slurry. Based on the characteristics of high saturation magnetization and high permeability of nano-iron powder, it is made into magnetic flux slurry, which can be used for the bonding structure of fine magnetic heads.
Nano-directing agent. Some nanoparticles are magnetic, and can be used as carriers to make targeting agents. Under the action of external magnetic field, drugs can be concentrated in the body, so that high-concentration drugs can be used to treat diseased parts, especially for diseases with fixed lesions such as tumors and tuberculosis. Magnetic fluid. Magnetic fluid made of iron, cobalt, nickel and their alloy powder has excellent properties and is widely used in sealing and damping, medical devices, sound adjustment, lighting display and other fields.
Efficient catalyst. Nano-nickel powder has a strong catalytic effect because of its huge specific surface area and high activity, and can be used for hydrogenation of organic compounds, automobile exhaust treatment and so on.
Efficient combustion improver. Adding nano-nickel powder into rocket solid fuel propellant can greatly improve the combustion heat and efficiency of fuel and improve the combustion stability.
Conductive adhesive Electronic paste is widely used in wiring, packaging and connection in microelectronics industry, which plays an important role in miniaturization of microelectronic devices. The electronic paste made of nickel, copper and aluminum nano-powders has excellent performance, which is conducive to the further miniaturization of circuits.
High performance electrode materials. Using nano-nickel powder and proper technology, electrodes with huge surface area can be manufactured, which can greatly improve the discharge efficiency.
Activated sintering additive. Nano-powder has high energy state and strong sintering ability at low temperature because of its large surface area and surface atoms. It is an effective sintering additive, which can greatly reduce the sintering temperature of powder metallurgy products and high temperature ceramic products.
Surface conductive coating treatment of metals and nonmetals. Nano-aluminum, copper and nickel have highly activated surfaces, so they can be coated at a temperature below the melting point of the powder under oxygen-free conditions. This technology can be applied to the production of microelectronic devices. Efficient catalyst. Zinc and its alloy nano-powders are used as catalysts.
Hard metal
The wear resistance and toughness of cemented carbide with common structure are mutually exclusive, and the coordination of this contradiction has always been the focus of cemented carbide research. It is found that when the grain size of tungsten carbide (WC) is reduced below 0.8μm, not only the hardness but also the strength of the alloy is improved, and the increase range is more obvious with the further reduction of grain size. This kind of cemented carbide tool with high hardness and strength shows excellent performance in machining hard and brittle materials (such as cold cast iron). The hardness of WC- 10Co ultrafine cemented carbide can reach 93, and the transverse fracture strength is more than 5000MPa. Nano-and ultra-fine grained cemented carbides have incomparable superior properties compared with ordinary cemented carbides, and their ability to meet the processing requirements of modern processing industry and special application fields of new materials is greatly improved. This "double high" (high wear resistance and high toughness) performance of nano-and ultra-fine structured cemented carbide is especially suitable for manufacturing tools and dies with good sharpness and rigidity, such as PCB micro-drills, V-shaped cutters, milling cutters and so on. At present, there is no uniform standard for the grain size of nano-and ultra-fine cemented carbides. Generally speaking, cemented carbide with grain size less than 0.5μm is ultrafine cemented carbide, and cemented carbide with grain size less than 0.2μm is nano cemented carbide. In this respect, the grading standards of sandvik, Sweden and German Powder Metallurgy Association are authoritative. Since 1990s, the research and development of ultrafine and even nano cemented carbide has become a hot spot in the field of cemented carbide technology in the world. Rutgers University took the lead in developing nano-structured cemented carbide in 1989 and obtained a patent. The advent of nano-structured cemented carbide is an epoch-making breakthrough in the field of cemented carbide, which opens up a new way to solve the contradiction between strength and hardness of cemented carbide. The team led by Academician Duan Xue of beijing university of chemical technology has made great progress in the research of ultra-short carbon nanotubes. Based on their long-term solid research and deep understanding of intercalation materials, Co-Al LDH intercalated with dodecylsulfonic acid anion (DSO) was synthesized by using the interlayer space limitation effect of layered dihydroxy metal hydroxide (LDH). Then, using methyl methacrylate (MMA) between LDH layers as carbon source, carbon nanorings with a length less than 1 nm (molecular scale), an outer diameter of about 20 nm and a wall thickness of about 3.5 nm were synthesized and grown under the catalysis of the active metal Co obtained by reduction.
Recently, researchers at the University of Pennsylvania in the United States invented a low-density, super-strong aerogel (a solid substance, the lowest density solid in the world), made of carbon nanotubes (a tube made of graphite atoms, which is light in weight and perfectly connected with a hexagonal structure), which can play a key role in cleaning up oil spills.
Stanford University released the first computer chip composed of carbon nano-transistors. Silicon transistors will come to an end sooner or later. Transistors are getting smaller and smaller, so that there are not enough silicon atoms to represent the characteristics of silicon. Carbon nanotubes (CNT), silicon germanium (SiGe) and arsenide (GaAs) are all possible substitutes. Carbon fiber nanotubes have good conductivity and small volume, and can be switched on and off instantly. It has electrical properties comparable to graphene, but it is much less difficult to manufacture semiconductors.
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Nanfeng Chemical: Nanfeng Chemical cooperated with Tsinghua University to develop carbon nanotubes. At present, the mass production technology of 15 kg/h carbon nanotubes developed by the nano-powder industrialization center has passed the expert appraisal of the Ministry of Education. China baoan: The leader of carbon nanotubes, the chemical engineer of MIT uses solar antenna made of carbon nanotubes, which uses 100 times more solar energy than ordinary solar photovoltaic cells. The development of "nano robot" belongs to the category of molecular bionics. Based on the biological principles at the molecular level, it designs and manufactures "functional molecular devices" that can operate in nano-space. The latest idea of nano-biology is to apply biological principles on the nano-scale, discover new phenomena and develop programmable molecular robots, also known as nano-robots. Synthetic biology redesigned the cell signal transduction and gene regulation network, and developed an "in vivo" or "wet" biological computer or cell robot, thus producing another way of nano-robot technology. Professor Zhou Haizhong, a famous scholar in China, predicted in his article on robots in 1990 that by the middle of 2 1 century, nano-robots will completely change the labor and lifestyle of human beings.