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Comparative studies of WC-Co-Ni composites obtained by conventional powder metallurgy

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Comparative studies of WC-Co-Ni composites obtained by conventional powder metallurgy

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Título Comparative studies of WC-Co-Ni composites obtained by conventional powder metallurgy
Autor Martins, Vinicius
Rodrigues, Wilson Correa
Ferrandini, Peterson Luiz
Villarinho, Denis Jardim
Knörnschild, Gerhard Hans
Schaeffer, Lirio
Abstract The present work reports a comparative study of cemented carbides of compositions WC-6Co, WC-10Co, WC-20Co, WC-6Co-6Ni and WC-12Ni-6Co. The purpose was to study the powder metallurgical production process of these compositions starting from a commercial WC-6Co powder, obtaining the desired compositions by mass balance with pure Co and pure Ni powders. During the process steps mixing, milling, compacting and sintering the powders were described by its apparent density, green density, shrinkage and sintered density. Lower densities were observed in composites with higher binder content. The process was monitored by scanning electron microscopy and EDS analysis to evaluate the homogeneity of the powders, to detect contaminations by the process and to characterize the microstructure of the sintered materials. A finer microstructure was found when the binder contained Ni. Potentiodynamic polarization tests in sulfuric acid revealed pseudo-passive behavior for all the tested hard metals.
Contido em Materials research : ibero-american journal of materials. vol. 14, n. 2, (June 2011), p. 274-279
Assunto Materiais compositos
Metalurgia do pó
[en] Hard metal
[en] Powder metallurgy
[en] WC-Co
[en] WC-Co-Ni
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/34285
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