Polysilicon ingots

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vidpneuqxd englisch tablemain trrow tdcell divblock divparagraph font0 font 1500pt impact sansserif font1 font 2800pt impact sansserif argon gas recycling unit solarsi ingot production

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serif sansserif argon gas recycling unit solarsi ingot production argon gas is required the production polycrystalline monocrystalline solar silicon ingots argon is rare expensive gas is currently exhausted to the atmosphere ald has developed implemented solution to recycle more than 80 this precious

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space protective atmosphere has been the latest trend recent years remelting under increased pressure to increase the nitrogen content the ingot is another variation esr esr furnaces can be designed remelting round square rectangular slab ingots finally computer controlled process automation

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production highquality ingots the esr technology is interest not only the production smaller weight ingots tool steels superalloys but also heavy forging ingots up to raw ingot weights 165 tons process technology process characteristics whereas var needs vacuum refining esr the consumable electrode is dipped

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wellsuited experi mental pilot production the per formance highversatility esr operation low investment cost stationary mold systems two fixed remelting stations one pivoting furnace head these are particularly suited efficient production high production rates ingot withdrawal systems central ingot

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eb 2011qxd tablemain trrow tdcell divblock divparagraph font0 font 600pt impact sansserif font1 font 900pt impact sansserif 5 directional solidification must be ensured over the entire ingot crosssection length to avoid interior defects such as macrosegregation shrinkage cavities nonuniform

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reactions 9632 it must have suitable viscosity remelting temperature spite directional dendritic solidification various defects such as the formation tree ring patterns freckles can occur remelted ingots reasons the occurrence these defects are the same as var it is important to note that white spots

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be avoided mointaining low pool depth eliminatmg disturbing mognetic fields through cooxiol current feeding the var lurnace white spots are lypical defects var ingots they are recogmzable as light etching spots o macroetched surface they are lower alloying elements eg titanium niobium inconel 71b

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tablemain trrow tdcell divblock divparagraph font0 font 1100pt impact sansserif font1 font 1300pt impact sansserif metallirgy the vacuum arc remelting process the var ingot s solidification structure ot given materiel h o fundion the locof solidificalion rate ont the temperature gradient the liquid

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reduction undesired trace elements high vopor pressure 9632 improvement oxide cleonliness 9632 athievement directionol solidification the ingot from bottom to top thus avoiding macrosegregotion ond reducing miaosegregotion oxide removol is achieved chemical physicol processes less stable oxides nitrides ore

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tablemain trrow tdcell divblock divparagraph font0 font 1000pt impact sansserif font1 font 1100pt impact sansserif font2 font 1300pt impact sansserif process control clote control ail remelling paromelers is required reproduable production homogeneous ingots which ore free mocrosegregation ond show

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water jocktl the intense heat generated the eledric arc melts fhe tip the electrode ond new ingot is progressively formed the watortooled mold high vocuum is being mointoined throughout ihe remelting process the hosic design the var furnoce hos been improved continuously over the yeors particulorly

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Spray Mark Systems Marking of aluminum ingot Marking of steel springs for type classifi cation Marking of steel coils Marking of drive shafts Precision application of oil to plastic parts Rope marking for length coding Ring marking of steel pipes Color-coded marking of refractory bricks

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segregations or ingot segregations. In conventional steel manufacturing processes the precipitation and accumulation of primary carbides in the ingot core can not be avoided. After ingot reduction, the carbides exhibit a banded structure. These carbide bands tend to considerably impair the transverse

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Hinblick auf Mikroseigerungen nach zuweisen. Vergleich des Konzentrationsverlaufes von Chrom und Molybdän sowie des Gefüges Warmarbeitsstahl BÖHLER W302 (WNr. 1.2344), Zustand gehärtet During solidification of an ingot, the steel production process involves unavoidable alloying element segregations