METHOD FOR SINTERING AND FORMING SILICON NITRIDE-BASE CERAMICS

PROBLEM TO BE SOLVED: To provide a method for sintering and forming silicon nitride-base ceramics by which a process for manufacturing a temporary sintered compact or a sintered compact can be eliminated. SOLUTION: When a sintered formed body of silicon nitride-base ceramics having excellent strengt...

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Hauptverfasser:	OJI TATSUKI, KONDO NAOKI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS REFRACTORIES SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER SLAG TRANSPORTING TREATMENT OF NATURAL STONE WORKING CEMENT, CLAY, OR STONE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for sintering and forming silicon nitride-base ceramics by which a process for manufacturing a temporary sintered compact or a sintered compact can be eliminated. SOLUTION: When a sintered formed body of silicon nitride-base ceramics having excellent strength and/or toughness is manufactured, a powdery silicon nitride-base starting material is compacted to manufacture a green compact, this compact is subjected to sintering and forming while restraining a part of the compact and plastic flow is caused to at least a part of the compact to control the orientation direction of the grains of each part of the resultant sintered formed body to a prescribed direction.