Synthesis and processing of nanocrystalline tungsten carbide: Towards cemented carbides with optimal mechanical properties
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http://dx.doi.org/10.1016/j.ijrmhm.2010.08.003 |
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Título
Synthesis and processing of nanocrystalline tungsten carbide: Towards cemented carbides with optimal mechanical propertiesAutoría
Fecha de publicación
2011-01Editor
ElsevierISSN
0263-4368Cita bibliográfica
International Journal of Refractory Metals and Hard Materials(Jan. 2011), vol. 29, no. 1, 78–84Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S0263436810001095Palabras clave / Materias
Resumen
Nanocrystalline tungsten carbide has been obtained by reduction/carburization at low temperature from precursors obtained by freeze-drying of aqueous solutions. Nanocrystalline WC powders with a adequate content of ... [+]
Nanocrystalline tungsten carbide has been obtained by reduction/carburization at low temperature from precursors obtained by freeze-drying of aqueous solutions. Nanocrystalline WC powders with a adequate content of carbon were mixed with submicrometric Cobalt powder (12 wt.%), obtained by same synthesis method, and sintered in vacuum furnace. The cemented carbides fabricated from experimental powders were compared with both commercial ultrafine and nanocrystalline WC-12Co mixtures consolidated by the same route. The synthesised powders were characterized by X-ray powder diffraction, elemental analysis and scanning and high resolution transmission electron microscopy. On the other hand, density, microstructure, hardness and fracture toughness together with X-ray diffraction analysis of the sintered materials were evaluated. The cemented carbides obtained from synthesised powders exhibited a WC platelet-based homogeneous microstructure. This anisotropic growth might be due to the presence of stacking faults parallel to the basal plane in the starting WC powder, which would promote the defect-assisted preferential growth. These materials showed excellent mechanical properties, with a superior hardness/fracture toughness combination compared to materials prepared from commercial mixtures. [-]
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