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2021-06-01 - Colloque/Présentation - communication orale - Anglais - page(s)

Delaunois Fabienne , Stanciu Victor Ioan , Erauw Jean-Pierre, Vitry Véronique , "The effect of the proportion of doped binder on the microstructure and properties of WC-Co composites" in Thermec'2021, Graz, Austria, 2021

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

Abstract(s) :

(Anglais) The durability of wear-resistant parts manufactured with WC-Co composites is related to the homogeneity of the material. To obtain a homogeneous composite, the carbide and the binder are mixed for long periods. To improve the sustainability of these products, a new type of binder was created by incorporating the grain growth inhibitor into cobalt. The presence of the hard inhibitor reduces the plasticity of the cobalt, in this way its incorporation into the mass of the tungsten carbide particles is favored and the homogenization time is reduced. A WC powder with a particle size of about 0.5 μm was mixed with 6, 9 and 12% by weight of cobalt powder doped with Cr3C2 (doped binder). The powders were mixed for 10 hours in a planetary mill with the speed of 600 rpm. The balls/ powder ratio was 4: 1 and 20 ml of ethanol was added as an anti-caking agent. Samples consisting of about 20 g of powder were pressed into a graphite mould of 20 mm diameter and sintered by the SPS technique at 1150 C with a heating rate of 50°C/min. As a general rule, the samples made with doped binder have a more homogenous microstructure. The doped binder provides superior densification for composites with 6 and 9% Co. The best hardness is 2100 HV30 for composites with 9% Co. Increasing the cobalt content to 12% decreases the hardness but does not result in an improvement in toughness (9.5 MPa*m1/2).