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    METHOD OF MANUFACTURING A CEMENTED CARBIDE MATERIAL
    14.
    发明公开
    METHOD OF MANUFACTURING A CEMENTED CARBIDE MATERIAL 审中-公开

    公开(公告)号：EP3393696A1

    公开(公告)日：2018-10-31

    申请号：EP16813071.4

    申请日：2016-12-19

    申请人： Element Six GmbH

    发明人： KONYASHIN, Igor Yurievich ,  RIES, Bernd Heinrich ,  HINNERS, Hauke

    IPC分类号： B22F3/00 ,  B22F3/15 ,  C22C1/05 ,  C22C29/06 ,  B33Y70/00

    CPC分类号： B22F3/008 ,  B22F2998/10 ,  B33Y10/00 ,  B33Y70/00 ,  C22C1/051 ,  C22C29/06 ,  C22C2204/00 ,  C23C4/00 ,  C23C24/10 ,  B22F3/15

    摘要： Cemented carbide granules suitable for making articles by additive manufacturing comprise carbide grains and a binder comprising any of cobalt, nickel and iron. The granules have a density of at least 99.5 % theoretical and a mean compressive strength of at least 40 MPa. The granules are made by milling cemented carbide powder in an organic fluid with a plasticiser to form a slurry, drying to form a powder, granulating the powder, screening the granules, sintering the screened granules for 2-20 minutes at a temperature in the range 1260-1330 degrees C in a vacuum or protective atmosphere to form an aggregation, breaking the aggregation to form sintered granules and re-screening. The method can further involve one of the following: i) solid-state sintering the granules prior to liquid phase sintering at the temperature in the range 1260-1330 degrees C or ii) forming the granules by pressing the powder into a green body and breaking it up.