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New Nano Material

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New Nano Material

Nano material is a branch with active and wide scientific studies in the field of nanotechnology. In the 1980s, we began to name materials with Nano. Nano material refers to a kind of solid material made up of nanoparticles, whose size is up to 100 nano.

Nano metal: for example, Nano-Iron is made by pressing the 6 nm iron crystals in mold, this increase 12 times in strength and 2 to 3 order of magnitude in the hardness than the ordinary iron. Using nano-iron, we can produce special steel with high strength and toughness. The high-melting-point metal is difficult to form, but as long as it is processed into nano-powder, it melts under the lower temperature, and could be made into heat-resistant components which can be used to develop the new under ultrahigh temperature materials used in high speed engine.

Nano-Ceramic: Nano-powder can lower the ceramic’s sintering temperature and simplify the processat the same time. With good plastic property and even superplasticity, nano-ceramic addresses the weakness of ordinary ceramic’s lack of toughness and greatly expands the application areas.

Carbon nanotubes: the diameter of carbon nanotube is 1.4 nm, it’s only 1% of the width of the thinnest wire on the computer microprocessor chips. The mass of carbon nanotubes is one-sixth of steel with the same volume, while the strength is 100 times of the latter. Carbon nanotubes will become the first choice for high energy fiber material, and will widely be used in the manufacture of micro - nano - scale electronic wires, switches and lines.

Nano – catalyst: The nano materials have significantly increased surface area and greatly changed surface structure, which enhance the surface activity, so it can be used as catalysts. For instance, ultrafine boron powder and ammonium dichromate powder can used as the catalyst in explosive production, ultrafine platinum powder and tungsten carbide powder are the efficient catalysts for hydrogenation, ultrafine silver powder can act as the catalyst for ethylene oxide, as a catalyst, ultrafine Fe3O4 particles can decompose CO2 into carbon and water at low temperatures, the combustion efficiency will be multiplied if adding a small amount of nickel powder into the rocket fuel.

There are two methods to produce nano-particles: concentration and inversion. Particles formed via the molecule polymers existing in the liquid or gaseous substances. These mutual conversion technology, precipitation technology and gas - phase process make it possible to produce high purity, monodisperse spherical particles, but the production capacity is very low, that means this method has limited ability to amplify.

Another method to produce nano-particles is by grinding the coarse particles, that is dispersion or top-down method. It needs high energy density wet grinding machine to achieve this goal. The application of grinding machine in new nano materials has slowly becoming commonplace, it can be efficiently and widely used in grinding raw materials and fine dispersion of pigments and so on.

MLCC, multi-layer ceramic capacitors: the nano materials used to produce these capacitors are usual the fine grinded titanium dioxide suspensions, or adding zirconium, niobium, cobalt barium titanate. These nano-particles are usually required to be up to 100 nm, The suspension has a special binder, when it is processed into ceramic films, the thickness of which is only 1 per thousand mm.

Another classic application case of nano – materials is chemical mechanical polishes (CMP). During this process, polishing suspension is used for wafer processing and chip production. The suspension has an effect of chemical and machinery corrosion to the polishing layer, and a mechanical grinding effect on the wafer surface. The particle size distribution of suspension must be accurately defined so as to obtain appropriate flowability. One of the most important things is to eliminate the all oversize particles, preventing flaws caused by scratches. Based on alumina or silicon dioxide, Topaz nano grinding machine is essential to the production of CMP materials.


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