Silicon nitride ceramics having a high reliability and a method for production thereof

The present invention relates to a silicon nitride sintered body having a remarkably increased strain-to-fracture, a low elasticity and high strength, characterized by consisting of a layered structure of alternating porous silicon nitride layers 1 to 1000 mu m thick with a porosity of 5 to 70 volum...

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Bibliographische Detailangaben
Hauptverfasser:	TORIYAMA, MOTOHIRO, HIRAO, KIYOSHI, BRITO, MANUEL E, SHIGEGAKI, YASUHIRO, KANZAKI, SYUZO
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS REFRACTORIES SLAG TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSPORTING TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	The present invention relates to a silicon nitride sintered body having a remarkably increased strain-to-fracture, a low elasticity and high strength, characterized by consisting of a layered structure of alternating porous silicon nitride layers 1 to 1000 mu m thick with a porosity of 5 to 70 volume % and dense silicon nitride layers 1 to 1000 mu m thick with a porosity of less than 5 volume %, being layered as materials with optional tiers. In addition, this invention relates to a method for producing the silicon nitride sintered body as described above, which comprises of forming dense layers and porous layers by sheet casting or extrusion forming so as to prepare the layers to be capable of 1 to 1000 mu m thick after sintering, stacking them to obtain layered materials with optional tiers and sintering them at 1600 DEG to 2100 DEG C. under a nitrogen atmosphere.