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18 records (took 0.021 seconds)

    11.
    发明专利
    未知

    公开(公告)号：SE8101509L

    公开(公告)日：1982-09-11

    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 ,  C04B35/64

    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.

    13.
    发明专利
    未知

    公开(公告)号：SE435272B

    公开(公告)日：1984-09-17

    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.

    Repairing surfaces of metal objects - by coating with inert powder and cleanser before heat pressing
    14.
    发明专利
    Repairing surfaces of metal objects - by coating with inert powder and cleanser before heat pressing 未知

    公开(公告)号：SE8106331L

    公开(公告)日：1983-04-28

    申请号：SE8106331

    申请日：1981-10-27

    Applicant: ASEA AB

    Inventor： FRIBORG S ,  MATTSSON B ,  NILSSON J

    IPC: C22F1/00

    Abstract: A method of repairing defects in metal articles comprises isostatic hot pressing with an inert gas. The metal detail is to be repaired, is surrounded with a powdered material which is arranged in an envelope of a powdered cleaning material with the power to neutralise gaseous compound in the inert gas pressure medium. It is characterised in that the detail is surrounded by a layer of a material 0.1-2 mm thick. Outside of this there is a layer 0.1-2 mm thick of a cleaning material. Used for repairing defects such as crack in turbine wheels. Typically the turbine wheel which is made of a nickel based super alloy surrounded by a layer of boron nitride which is applied by immersion in a slurry of boron nitride in acetone and binder. This layer is surrounded by another layer which is made of silicon and is applied, after the boron nitride has dried, by painting with a slurry containing silicon in an emulsion of a polymer of acrylate and methacrylate in isopropanol. After drying the wheel is isostatically pressed in an oven at high temperature in the presence of argon containing less than 5ppm oxygen, less than 50 ppm nitrogen and less than 15 ppm steam. (Provisional basic previously advised in Week K24).

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