| 摘要 |
PURPOSE:To obtain a ceramic having high strength and dimensional accuracy, by adding a thermoplastic resin binder to a metallic Si powder, compression molding the mixture under heating to form a molded article having high volume filling ratio of the powder, removing the binder with heat and thermally sintering the product in a nitriding gas atmosphere. CONSTITUTION:A binder composed of a thermoplastic resin (e.g. polyethylene) is added to metallic Si powder or an inorganic compound powder containing >=45vol.% of metallic Si powder and the mixture is kneaded under heating. The kneaded mixture is compression molded in hot state to form a molded article having a volume filling ratio of the powder of >=70vol.% and the binder in the molded article is removed with heat. The product is thermally sintered in a nitriding gas atmosphere to obtain a ceramic having high strength and dimensional accuracy and composed of particles of Si3N4 or an inorganic compound bonded with each other through particles and whiskers of Si3N4 produced from Si. The ceramic is suitable as a material for an engine, etc.
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