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 Wysłany: Czw 21:57, 06 Sty 2011 Temat postu: ugg prezzo Discussion on the development of specia |
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Discussion on the development of specialty alumina
Small, large surface area,[link widoczny dla zalogowanych], surface activity strong. The heat capacity of nano-metallic materials, usually 2 times of traditional metal, nano-metals with low melting point metal several hundred degrees than the average. LOnm diameter aluminum melting point, its melting point of 660 ℃ liquidus down to l8 ℃. The melting point of nanoparticles, the initial sintering temperature and crystallization temperature are lower than normal number of powder. A10 in the conventional sintering temperature 2073 ~ 2173K, while the nano A1z0; under certain conditions, sintering temperature 1423 ~ 1773K, the density of up to 99.7% of nano hhO, made of precision ceramic powder, with good ductility and similar metal singular tenacity to solve the problem of brittle ceramic, porcelain floor that is not broken a reality. Application of nano-alumina has been progress, the nano A1z0, release the rubber particles can improve the dielectric properties of rubber and wear resistance; nano hhO added to the metal or alloy, grain refinement can improve the temperature impact toughness of the material; nano A1z0, the suspension can be used in advanced optical glass, crystal and all kinds of precious stones polishing. Al based nanocomposites, the amorphous matrix on the proliferation of distributed-Al particles in the nanometer scale,[link widoczny dla zalogowanych], with high strength composites for turbine engine ceramic insulation, high temperature corrosion-resistant bearings. In addition, the nano-alumina can also be widely used in chemical, food and pharmaceutical industries. Preparation of nano-materials (including powders, bulk and thin film preparation methods), there are physical, chemical,[link widoczny dla zalogowanych], physical and other chemical and mechanical method can also be prepared in accordance with the environment of these methods are classified, there is gas, liquid phase and solid phase in the gas phase method, high melting point in the vacuum chamber of AhO manipulation by sublimation, condensation in the liquid nitrogen cooling wall for the nano-particles, nano particles blowing people collector, and then pressure forming in situ (sintering) by nano-alumina block. In the liquid phase method, the easy hydrolysis of the A10 in some solvents react with water after gel polycondensation process gradually, and then by drying, sintering, obtained a AkO and d-Alz0 powder, average particle size 40rim and 100nm, with good suppression performance in the solid state, is under the protection of argon gas, etc., by mechanical grinding process, so that fine particles continue to get nano-particles. Nano materials and products now have been gradually entering the market, the economic benefits they create will be expected to increase 20% annual growth rate of nano-structure of the 2001 U.S. ultra-fine powder and coating materials market will grow to the amount of input 1 .6 billion. Further deep nano-materials research and development of new nano materials, so that the application of nano-materials market will continue to expand. German Ministry of Science and Technology of nano-materials on the world market capacity is estimated at: In 2000, the structure of nano materials, devices market capacity 637.5 billion U.S. dollars, nanopowders, nano-composite ceramics and other composite materials, the market capacity of 545.7 billion U.S. dollars, nano materials thin film devices market capacity of 340 million U.S. dollars, Nano ultra-precision processing technology market capacity of 442 million U.S. dollars, nano-crystalline materials and growth technology market capacity of 238 million U.S. dollars, the evaluation of nanomaterials measured by means of market capacity of 2.72 billion . Of nano-materials of a late start, but the development of faster, has built more than 100 production lines. Metal nano-materials production capacity of 5t / a, SiO,[link widoczny dla zalogowanych], TiO,[link widoczny dla zalogowanych], A10 and other production capacity of 300t / a, CaCO, nano-materials production capacity of 1000t / a; metal nano powder with l0 species, product quality up to international standards. Nanotechnology has attracted the attention of the world, the development of specialty alumina alumina industry will become a hot technology and economic growth. * Bulletin aluminum company Norsk Hydro Norsk Hydro Aluminium modernization with the Thomson Corp. Thomson Total Company Total Seurat aluminum smelter up to NOK 619 million (U.S. $ 66,200,000) modernization and expansion of rhyme signed a contract to build the project. The project started in June 2001 plus, 2004 l1 completed in January, when Hydro Aluminum Johnson Total annual production capacity will reach 321,000 t, to become Europe's largest aluminum smelters. By that time, in 1950 the old smelter building Se Deer Fort will be closed, and reconstruction of the electrolytic production of 6 lines. The contract also includes: new or in situ reconstruction is a cost of NOK 1.3 billion (U.S. $ 13,900,000) anode plant selection, construction 275kA rectifier, 24kV power distribution, water extraction, gas purification and the old factory demolition a package of projects, total project cost is expected to reach 5.6 billion kroner (600 million U.S. dollars to Taiwan) Rhodes first compiled since the (Aluminium} 2001
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