Resumo

ARDILA-TELLEZ, Luis Carlos  e  HERRERA-QUINTERO, Liz Karen. Fabrication and characterisation of tungsten carbide WC-X (X=Co, Ni) obtained by powder metallurgy. Ingeniería Mecánica [online]. 2017, vol.20, n.1, pp.6-13. ISSN 1815-5944.

Powder metallurgy is a technology poorly developed in Colombia despite of worldwide success. At local level, machine tool, automotive and oil & gas sectors are the largest consumers of this kind of alloys. This article address in the PM process of ceramic-metallic materials known as CERMETS. Were successfully sintered and characterised the alloys 90WC8Co2Ni and 94WC6Ni used in oil & gas nozzle and valve seats and they were compared with commercial ones. EDS and XRD of the two alloys, laboratory and commercial, are similar; however, its microstructure and hardness differ due to manufacturing process and WC grain size. Commercial alloys have hardness 15-19 % higher than laboratory. In the commercial composition, with only nickel, defects associated to the manufacturing process were detected. Meanwhile laboratory samples not show those anomalies.

Palavras-chave : powder metallurgy; hardmetal; microstructure; characterisation; grain size.

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