流動層直接窒化ケイ素粉末による窒化ケイ素焼結体の機械的特性

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  • Mechanical Properties of Sintered Si3N4 from Powder Produced by Fluidized-Bed Direct Silicon Nitridation

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Si3N4 powder, produced by the fluidized-bed direct nitridation of silicon, was blended with water, compacted by pressure slip casting, and sintered under a pressurized nitrogen atmosphere. Compacts made from the powder showed roughly the same sinterability as those made from commercially available imide-process powder, yielding a hardness of Hv 1570, a fracture toughness of 7.2 MPa√m, and a three-point bending strength of 1062 MPa, highest values attainable with Si3N4. The powder produced by the fluidized-bed direct nitridation may replace the Si3N4 powder from the other process, when water is used for preparing slips. A processing rout is proposed, which may realize a substantial reduction of total cost for producing sintered Si3N4 parts.<br>

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