SLURRY-DESIGNATED SILICON NITRIDE POWDER AND METHOD FOR PRODUCING SAME, SILICON NITRIDE POWDER SLURRY FOR USE IN MOLD RELEASE AGENT AND METHOD FOR PRODUCING SAME, SILICON NITRIDE POWDER FOR USE IN MOLD RELEASE AGENT, MOLD RELEASE AGENT, AND POLYCRYSTALLINE-SILICON-CASTING MOLD AND METHOD FOR PRODUCING SAME

Provided are: a silicon nitride powder slurry for use in mold release material and capable of forming, on a polycrystalline silicon casting mold, a mold release layer which exhibits favorable mold release properties of a polycrystalline silicon ingot, and which exhibits favorable adhesion to the cas...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAO, Takeshi, HONDA, Michio, JIDA, Shinsuke
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES CASTING CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOUNDS THEREOF CORRECTING FLUIDS DYES FILLING PASTES FOUNDRY MOULDING FUELS INKS INORGANIC CHEMISTRY LUBRICANTS LUBRICATING COMPOSITIONS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-METALLIC ELEMENTS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES POLISHES POWDER METALLURGY TECHNICAL GASES CONTAINING CARBON MONOXIDE TRANSPORTING USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	Provided are: a silicon nitride powder slurry for use in mold release material and capable of forming, on a polycrystalline silicon casting mold, a mold release layer which exhibits favorable mold release properties of a polycrystalline silicon ingot, and which exhibits favorable adhesion to the casting mold after casting the polycrystalline silicon ingot, without requiring use of an additive such as a binder, and without requiring execution of a baking step; a method for producing the same; a silicon nitride powder for mold release material; mold release material; a silicon nitride powder for a slurry use for obtaining the silicon nitride powder slurry for use in the mold release material; a method for producing the same; a polycrystalline silicon casting mold which exhibits favorable mold release properties of a polycrystalline silicon ingot; and a low-cost method for producing the same. The present invention pertains to a silicon nitride powder to be used in a slurry for forming a mold release layer of a polycrystalline silicon casting mold, wherein the specific surface area thereof is 5-50m 2 /g, the proportion of amorphous silicon nitride is 1.0-25.0 mass%, and the oxygen content is 0.6-2.5 mass%.