Binder jet printed WC infiltrated with pre-made melt of WC and Co

Cramer, Corson L.; Aguirre, Trevor G.; Wieber, Natalie R.; Lowden, Richard Andrew; Trofimov, Artem A.; Wang, Hsin; Yan, Jiaqiang; Paranthaman, M. Parans; Elliott, Amy M.

doi:10.1016/j.ijrmhm.2019.105137

Title: Binder jet printed WC infiltrated with pre-made melt of WC and Co

Journal Article · 25 October 2019 · International Journal of Refractory and Hard Metals

DOI: https://doi.org/10.1016/j.ijrmhm.2019.105137 · OSTI ID:1607097

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

WC-Co was made via binder jet additive manufacturing of tungsten carbide followed by melt infiltration with a Co-WC infiltrant. The goal of the study was to achieve fully densified parts in near-net shape with minimal shrinkage while keeping the Co content low. The exact amount of infiltrant was determined in order to fully densify with minimum shrinkage based on the actual volume taken up by WC powder in the preform based on theoretical density, the bounding volume of prints after shrinkage, and the volume from the infiltrant. The eutectic nature of the infiltrant enabled melting at much lower temperature compared to the melting temperature of pure Co. The density, microstructure, grain size, hardness, and fracture toughness were characterized. The shrinkage and net shaping were assessed with light scans. A detailed look at the fracture mechanics was assessed. Here, this approach achieved highly dense WC-Co parts in net-shape with Co vol% of near 29 (Co wt% ~19), density of 96.2% theoretical, hardness of 8.34 GPa, grain size of 7.7 μm, magnetic saturation of 0.5 T, room temperature thermal conductivity of 125 W/mK, and fracture toughness of 24.7 = MPa·m^1/2.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1607097

Journal Information:: International Journal of Refractory and Hard Metals, Journal Name: International Journal of Refractory and Hard Metals Journal Issue: C Vol. 87; ISSN 0263-4368

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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