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    • 3. 发明专利
    • PRESSURE SINTERING METHOD USING CORE
    • JPH1046211A
    • 1998-02-17
    • JP21934896
    • 1996-07-31
    • TOYAMA PREFECTUREYOKOTA MASARU
    • NAGARA KIICHITOMITA SHOGOYOKOTA MASARU
    • B22F3/14B22F5/00B22F5/10
    • PROBLEM TO BE SOLVED: To obtain a net-shape in one process and in a short time and to reduce the producing cost by using a high m.p. core and sintering with an one axial pressing electric discharge sintering machine, at the time of producing a metallic or a ceramic sintered body having a hollow shape or a complicate shaped through-hole. SOLUTION: Metallic or ceramic powder 1 together with the core 2 formed from the high m.p. ceramics, are inserted into a die 5 for sintering and electrically sintered under the one-axial pressure 8 between an upper and a lower punches 3, 4. At this time, the used core 2 is manufactured by compacting the ceramic powder having m.p. by >=80 deg.C than the m.p. of the powder 1 to be sintered and difficult-to-react with the sintered material of the powder 1 and the die material at room temp. or by forming with an organic binder and calcining and is made to the one easily broken with a small force. By this method, after completing the sintering operation, the core 2 is made to powder state and can be discharged from a core taking-out hole arranged in the sintered material 1. Further, the discharged ceramic core material can be used by regenerating.