Silicon,and,silicate,materials business, insurance Silicon and silicate materials
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Amorphous silicon powder in powder state, with strongchemical reactivity, easy to combine with oxygen, severe reaction will cause burning,silicon is easy to react with hydrofluoric acid and dissolved, thus industrialcleaning silicon impurities commonly used hydrofluoric acid. Silicon is an importantsemiconductor material, chemical property is more stable, but soluble in strongacid and hydrofluoric acid; under high temperature conditions, its surface canreact with oxygen and chlorine in the air; in the air conditions can directlycombine with hydrogen. Both amorphous silicon powder and crystalline silicon at high temperature can dissolve in aqueoussolution of alkali and produce hydrogen.Crystallinecan be divided into monocrystalline silicon and polycrystalline silicon twokinds. There is only one nuclei in monocrystalline silicon, is an importantmaterial for manufacturing semiconductor device. While manufacturingsemiconductor materials, need to turn the usually obtain polycrystallinesilicon into monocrystalline silicon, heated and melted the polycrystalline silicon,and introduce silicon crystal nuclei in it, then the monocrystalline silicon nucleusgrows into a single piece of silicon, that is the silicon crystal. Then cut offthe rod single crystal silicon cross sectioned along can be obtained singlecrystal silicon.Siliconis a black opaque solid. Purity of 99.93% monocrystalline silicon, meltingpoint (1415±2), the hardness is high. The crystal lattice is the same as diamond,conductivity is similar with ishiguro. Crystalline silicon surface ishydrophobic, after oxidized become hydrophilic. The wafer manufactured bysingle crystal silicon during machining the surface will show up deformed layer,because a lot of dirt will be attached on this deformed layer and have adverseeffects on the performance of semiconductor material, must be removed. Cleaningsemiconductor material is a relatively complex process, also a characteristicof semiconductor processing.Naturalsilicates are made of silicon dioxide and various metal oxides salts (including Na, K,Ca, Mg, Al, Fe and other metal), widely distributed in nature, rocks, soil,minerals. Feldspar, stone, kaolinite, mica, asbestos, talc and so on are themain component of natural mineral silicates, their chemical structure is verycomplex and often regard them as silica and metal oxide of composite oxide.Naturalsilicates are industrially important materials, electricity is an importantindustrial raw material. Natural silicate as the main raw material, throughhigh-temperature processing made into a variety of silicate materials includingglass, ceramic, cement, bricks, refractory, ceramic, fiberglass, cast stone,abrasives, high temperature resistant inorganic coatings. Because of in thestructure, silicon-oxygen tetrahedron as the skeleton, silicon-oxygen bondenergy is high, so most of silicate material has a high mechanical strength,high temperature resistant characteristics.Thechemical composition of glass is more complex, wherein the silica is the majorcomponent constituting the glass skeleton. High purity crystalline state naturalmineral called silica crystal. Its physical and chemical properties ofstability are unlike ordinary glass plasticity. If melted and quenched the crystalpure silica and other minerals will get the quartz glass. In the quench process,the silica crystal structure damaged, so its melting point is lower than thecrystal, has a very low coefficient of thermal expansion, and has plasticity, aspecial unique properties glass.Source:http://www.mhcmp.com
Silicon,and,silicate,materials