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    3.
    发明专利
    未知

    公开(公告)号：SE7701308L

    公开(公告)日：1978-08-08

    申请号：SE7701308

    申请日：1977-02-07

    Applicant: ASEA AB

    Inventor： MATTSSON B ,  NILSSON J

    IPC: B21C25/00 ,  B21C23/00 ,  B21C25/04 ,  B21C23/21

    Abstract: Disclosed is a mandrel for a high pressure tube extrusion press. The mandrel comprises a tip member providing a tip adapted to be positioned in the die opening of the press to present an annular gap for tube extrusion, and a carrier for the tip member. The carrier has a threaded central tip member receiving bore for threadably receiving a threaded segment of the tip member therein. A divided ring shaped element is disposed between a flange on the tip member and the carrier in an annular space provided at the mouth of the bore to facilitate the assembly and disassembly of the mandrel and prevent inadvertent separation of the tip member from the carrier.

    4.
    发明专利
    未知

    公开(公告)号：SE8300645D0

    公开(公告)日：1983-02-08

    申请号：SE8300645

    申请日：1983-02-08

    Applicant: ASEA AB

    Inventor： ADLERBORN J ,  LARKER H ,  NILSSON J ,  MATTSSON B

    IPC: B22F3/12 ,  B22F3/14 ,  B22F3/15 ,  C04B35/58 ,  C04B35/593 ,  C04B35/645

    Abstract: An object is manufactured from a powdered material by isostatic pressing of a body, preformed from the powdered material, with a pressure medium, whereby the preformed body, in which at least the surface layer consists of a ceramic material in the form of a nitride, is surrounded by a casing which is rendered impenetrable to the pressure medium, before the isostatic pressing is carried out and the powder sintered. As the material in the casing there is used boron oxide or a glass containing boron oxide or a material forming glass while being heated, in which the content of boron oxide is sufficiently high for the glass-or the glass formed during heating-to be removable by water. The preformed body surrounded by the casing is subjected to a heat treatment for the formation of boron nitride on the surface of the preformed body, before the isostatic pressing is carried out. The casing is removed from the finished product by means of water or water vapor.

    6.
    发明专利
    未知

    公开(公告)号：SE413995B

    公开(公告)日：1980-07-07

    申请号：SE7701308

    申请日：1977-02-07

    Applicant: ASEA AB

    Inventor： MATTSSON B ,  NILSSON J

    IPC: B21C25/00 ,  B21C23/00 ,  B21C25/04 ,  B21C23/08

    Abstract: Disclosed is a mandrel for a high pressure tube extrusion press. The mandrel comprises a tip member providing a tip adapted to be positioned in the die opening of the press to present an annular gap for tube extrusion, and a carrier for the tip member. The carrier has a threaded central tip member receiving bore for threadably receiving a threaded segment of the tip member therein. A divided ring shaped element is disposed between a flange on the tip member and the carrier in an annular space provided at the mouth of the bore to facilitate the assembly and disassembly of the mandrel and prevent inadvertent separation of the tip member from the carrier.

    Method related to isostatic hot pressing of preformed bodies of a metallic or ceramic material
    7.
    发明专利
    Method related to isostatic hot pressing of preformed bodies of a metallic or ceramic material 未知

    公开(公告)号：SE425361B

    公开(公告)日：1982-09-27

    申请号：SE7909205

    申请日：1979-11-07

    Applicant: ASEA AB

    Inventor： ADLERBORN J ,  LARKER H ,  MATTSSON B ,  NILSSON J

    IPC: B22F3/04 ,  C22C1/04 ,  B22F3/14

    Abstract: An object of a metallic material or other ceramic material than silicon nitride or than a material having silicon nitride as its main component is manufactured by isostatic pressing of a body preformed from a powder of the metallic or ceramic material, whereby the preformed body is embedded in glass, for example embedded in a mass of glass particles, and the embedment, with the body and the embedment placed in a vessel which is dimensionally stable at the temperature at which the sintering of the metallic or ceramic material is carried out, is transferred to a melt having a surface limited by the walls of the vessel, below which surface the preformed body is located, and a pressure necessary for the isostatic pressing of the preformed body then being applied on the melt by a gaseous pressure medium.

    9.
    发明专利
    未知

    公开(公告)号：SE8300645L

    公开(公告)日：1984-08-09

    申请号：SE8300645

    申请日：1983-02-08

    Applicant: ASEA AB

    Inventor： ADLERBORN J ,  LARKER H ,  NILSSON J ,  MATTSSON B

    IPC: B22F3/12 ,  B22F3/14 ,  B22F3/15 ,  C04B35/58 ,  C04B35/593 ,  C04B35/645 ,  C04B35/64 ,  B22F3/04

    Abstract: An object is manufactured from a powdered material by isostatic pressing of a body, preformed from the powdered material, with a pressure medium, whereby the preformed body, in which at least the surface layer consists of a ceramic material in the form of a nitride, is surrounded by a casing which is rendered impenetrable to the pressure medium, before the isostatic pressing is carried out and the powder sintered. As the material in the casing there is used boron oxide or a glass containing boron oxide or a material forming glass while being heated, in which the content of boron oxide is sufficiently high for the glass-or the glass formed during heating-to be removable by water. The preformed body surrounded by the casing is subjected to a heat treatment for the formation of boron nitride on the surface of the preformed body, before the isostatic pressing is carried out. The casing is removed from the finished product by means of water or water vapor.

    10.
    发明专利
    未知

    公开(公告)号：SE426815B

    公开(公告)日：1983-02-14

    申请号：SE8101509

    申请日：1981-03-10

    Applicant: ASEA AB

    Inventor： ADLERBORN J ,  LARKER H ,  MATTSSON B ,  NILSSON J

    IPC: B22F3/12 ,  B22F5/04 ,  B22F7/06 ,  B28B1/00 ,  C04B35/593 ,  C04B35/645 ,  C04B37/00 ,  F01D5/28 ,  C04B35/58

    Abstract: In the manufacture of an article of ceramic material, for example a bladed turbine wheel of silicon nitride, there is first formed a plurality of article parts, at least one of which is a shaped powder body formed from powder of ceramic material mixed with a plasticizer, after which the plasticizer is driven off by a suitable heating operation. The article parts are then assembled together into a configuration conforming to that of the article to be manufactured, and the assembled article parts are surrounded with a gas-impermeable layer, for example a layer of glass. Finally, the assembled parts are isostatically pressed at elevated temperature to form the assembled article parts into a dense, homogeneous article.

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