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    33.
    发明专利
    未知

    公开(公告)号：SE8201678L

    公开(公告)日：1983-09-18

    申请号：SE8201678

    申请日：1982-03-17

    Applicant: ASEA AB

    Inventor： LARKER H

    IPC: B22F1/02 ,  B22F3/15 ,  H01F1/14 ,  B22F1/00 ,  H01F1/24 ,  H01F1/33 ,  H01F1/22

    Abstract: A method for manufacturing an object of soft-magnetic material by bonding together a mass of powder grains of iron-based soft-magnetic material in the form of pure iron or in the form of iron containing silicon, aluminium and/or titanium. The grains are provided either with a coating (2) containing iron oxide chemically bonded to the grains and, at least in those cases where the iron-based material consists of pure iron, containing in addition thereto an oxide of silicon, aluminium and/or titanium, or the grains are provided with a coating (2) containing a reaction product of iron oxide, which oxide is chemically bonded to the grains, and an oxide of silicon, aluminium and/or titanium. The grains provided with said coating are subjected to an isostatic pressing at a temperature of at most 900 DEG C and at a pressure necessary for forming a coherent, compact body of the powder mass. The coating preferably has a thickness of 0.01 - 0.5 mu m.

    35.
    发明专利
    未知

    公开(公告)号：SE414922B

    公开(公告)日：1980-08-25

    申请号：SE7804990

    申请日：1978-05-02

    Applicant: ASEA AB

    Inventor： ADLERBORN J ,  LARKER H ,  NILSSON J

    IPC: C04B35/584 ,  B22F3/12 ,  C04B35/593 ,  C04B35/645 ,  C04B35/58 ,  C01B21/068

    Abstract: Disclosed is a method for manufacturing an object of silicon nitride. In the method, a body preformed from silicon nitride is surrounded with a casing which is permeable to gas. Upon heating, the casing is transformed into a layer which is impermeable to a pressure medium which is used during isostatic pressing of the preformed body while a pressure outside the casing is maintained which is at least as high as the pressure of the gas which is present in the pores of the preformed product. After the casing has been made impermeable to the pressure medium and the preformed body has been enclosed therein, the isostatic pressing is carried out while the body is simultaneously sintered.

    METHOD OF MANUFACTURING AN OBJECT OF SILICON NITRIDE
    38.
    发明专利
    METHOD OF MANUFACTURING AN OBJECT OF SILICON NITRIDE 未知

    公开(公告)号：ZA792082B

    公开(公告)日：1980-05-28

    申请号：ZA792082

    申请日：1979-05-01

    Applicant: ASEA AB

    Inventor： LARKER H ,  NILSSON J ,  ADLERBORN J

    IPC: C04B35/584 ,  B22F3/12 ,  C04B35/593 ,  C04B35/645 ,  C04B35/58

    Abstract: Disclosed is a method for manufacturing an object of silicon nitride. In the method, a body preformed from silicon nitride is surrounded with a casing which is permeable to gas. Upon heating, the casing is transformed into a layer which is impermeable to a pressure medium which is used during isostatic pressing of the preformed body while a pressure outside the casing is maintained which is at least as high as the pressure of the gas which is present in the pores of the preformed product. After the casing has been made impermeable to the pressure medium and the preformed body has been enclosed therein, the isostatic pressing is carried out while the body is simultaneously sintered.

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