A COATING COMPOSITION FOR A MOULD

A COATING SYSTEM FOR A MOULD FOR THE DIRECTIONAL SOLIDIFICATION OF SILICON. THE COATING IS APPLIED AS AN AQUEOUS SLURRY OF SILICON NITRIDE PARTICLE, CARBON BLACK AND MICROSILICA. THE MOULD IS PREFERABLY OF A CERAMIC MATERIAL, SUCH AS GLASSY CARBON, SILICA, SILICON NITRIDE, OR MULLITE, BUT THE PREFER...

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Bibliographische Detailangaben
Hauptverfasser:	ENEBAKK, ERIK, TRONSTAD, RAGNAR
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING APPARATUS THEREFOR CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS CRYSTAL GROWTH DYES FILLING PASTES INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH TRANSPORTING UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL USE OF MATERIALS THEREFOR WOODSTAINS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A COATING SYSTEM FOR A MOULD FOR THE DIRECTIONAL SOLIDIFICATION OF SILICON. THE COATING IS APPLIED AS AN AQUEOUS SLURRY OF SILICON NITRIDE PARTICLE, CARBON BLACK AND MICROSILICA. THE MOULD IS PREFERABLY OF A CERAMIC MATERIAL, SUCH AS GLASSY CARBON, SILICA, SILICON NITRIDE, OR MULLITE, BUT THE PREFERRED MATERIAL IS GRAPHITE. PREFERABLY THE COATING APPLICATION IS APPLIED AS AN AQUEOUS SUSPENSION. IT MAY BE APPLIED BY PAINTING, SPRAYING OR DIPPING. IT MAY BE DEPLOYED AS A SERIES OF SUB-LAYERS WHICH ARE APPLIED SEQUENTIALLY. PREFERABLY, THE TOP LAYER COMPOSITION COMPRISES SILICON NITRIDE AND/OR SILICON CARBIDE. THE PURPOSE OF THE BASE LAYER IS TO PROVIDE A DENSE TIGHTLY BONDED LAYER ON THE SURFACE OF THE MOULD WHICH PREVENT METAL INFILTRATION, THE OBJECTIVE OF THE TOP LAYER IS TO PREVENT METAL INFILTRATION AND TO PROVIDE EASY RELEASE BETWEEN INGOT AND MOULD. IN ADDITION TO A TOP COAT, THERE MAY ALSO BE AN INTERMEDIATE COAT OR LAYER, BETWEEN THE BASE LAYER OR BASIC COATING AND THE TOP LAYER.