VERFAHREN ZUR HERSTELLUNG VON POLYKRISTALLINEM MATERIAL UND VORRICHTUNG DAFUER

The invention relates to a process for the preparation of polycrystalline materials, and to an equipment suitable to the accomplishing thereof. The process comprises the steps of: 1) submitting the material to be crystallized to a heating by means of a resistor which extends vertically, and is posit...

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Bibliographische Detailangaben
Hauptverfasser:	DI RESE, LEONARDO, PARAGGIO, VINCENZO, SCAFE, ERNESTO, MARGADONNA, DANIELE
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY COMPOUNDS THEREOF CRYSTAL GROWTH INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SEPARATION SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH TRANSPORTING UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	The invention relates to a process for the preparation of polycrystalline materials, and to an equipment suitable to the accomplishing thereof. The process comprises the steps of: 1) submitting the material to be crystallized to a heating by means of a resistor which extends vertically, and is positioned around said material, charged on a laterally thermally insulated and open atop vessel, up to a temperature lower by 30 to 100 DEG C than material's melting temperature; 2) submitting the material in the vessel to a further heating from the bottom, up to reaching a temperature greater by 30 to 200 DEG C than material's melting temperature; 3) submiting molten material to cooling, decreasing the heating from the bottom, with a rate comprised within the range of from 0.1 DEG C/minute to 3 DEG C/minute, in a time comprised within the range of from 10 to 30 hours; 4) extracting polycrystalline material in the shape of a slab. The equipment is shown in the figure.