Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies |
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Authors: | V Bonache MD SalvadorA Fernández A Borrell |
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Affiliation: | a Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Camino de Vera, s/n, 46022 Valencia, Spainb Fundación ITMA, Parque Tecnológico de Asturias, 33428 Llanera (Asturias), Spainc Centro de Investigación en Nanomateriales y Nanotecnología (CINN) (Consejo Superior de Investigaciones Científicas, Universidad de Oviedo, Principado de Asturias), Parque Tecnológico de Asturias, 33428 Llanera (Asturias), Spain |
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Abstract: | The aim of present work is to study the effect of VC and/or Cr3C2 in densification, microstructural development and mechanical behavior of nanocrystalline WC-12wt.%Co powders when they are sintered by spark plasma sintering (SPS) and hot isostatic pressing (HIP). The results were compared to those corresponding to conventional sintering in vacuum. The density, microstructure, X-ray diffraction, hardness and fracture toughness of the sintered materials were evaluated. Materials prepared by SPS exhibits full densification at lower temperature (1100 °C) and a shorter stay time (5 min), allowing the grain growth control. However, the effect of the inhibitors during SPS process is considerably lower than in conventional sintering. Materials prepared by HIP at 1100 °C and 30 min present full densification and a better control of microstructure in the presence of VC. The added amount of VC allows obtaining homogeneous microstructures with an average grain size of 120 nm. The hardness and fracture toughness values obtained were about 2100 HV30 and close to 10 MPa m1/2, respectively. |
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Keywords: | WC-Co cemented carbides Nanocrystalline powders Grain growth inhibitors SPS HIP |
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