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2018-09-16 - Colloque/Article dans les actes avec comité de lecture - Anglais - 6 page(s)

Stanciu Victor Ioan , Vitry Véronique , Delaunois Fabienne , "Impact of WC-Co powder preparation on the SPS sintering behavior" in 2018 World Congress on Powder Metallurgy, Beijing, Chine, 2018

  • Codes CREF : Métallurgie (DI2310), Matériaux céramiques et poudres (DI2744), Traitement thermique des métaux (DI2317)
  • Unités de recherche UMONS : Métallurgie (F601)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) Powder mixing is a very important step in the preparation of WC-Co alloys. In many studies, the powders are homogenized by ball milling and parameters such as balls size, balls materials and milling speed, which have a high impact on the particles size, are not even taken into account. Often, only the mixing time is considered but this time can vary from 30 minutes to 72 hours. Mixing installations can also be very different, from low-energy mixers to high-energy planetary ball mills. The effect of all those parameters on the powder is so important that a comparison of the sintering behavior of powders from different studies is impossible. In this study, the homogenization was carried out at two energy levels (rotation speeds of 300 and 600 rpm) using two size of tungsten carbide balls (Ø10 and Ø12 mm). The mixing time was fixed at 6 hours. A WC powder with a particle size of about 1-2 μm was mixed with a cobalt powder pre-doped with Cr3C2 (doped binder). Samples were produced by SPS sintering at 1150°C under 50 MPa. The samples were analyzed for granulometry and the size of the crystalline grains was measured before and after sintering. The densification reached 98.9 to 99.5%. The homogenization conditions have an important effect on the mechanical properties, the hardness of the samples increasing from 1725 hv30 to 1890 hv30, by increasing the homogenization rate.

Identifiants :
  • FNRS : Reference No: "846794"

Mots-clés :
  • (Anglais) Inhibitors
  • (Anglais) Doped binder
  • (Anglais) SPS
  • (Anglais) Cemented carbides