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

Abstract

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·m1/2.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
OSTI Identifier:
1607097
Alternate Identifier(s):
OSTI ID: 1594214
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Refractory and Hard Metals
Additional Journal Information:
Journal Volume: 87; Journal Issue: C; Journal ID: ISSN 0263-4368
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; binder jet additive manufacturing; WC-Co; eutectic; infiltration

Citation Formats

Cramer, Corson L., Aguirre, Trevor G., Wieber, Natalie R., Lowden, Richard Andrew, Trofimov, Artem A., Wang, Hsin, Yan, Jiaqiang, Paranthaman, M. Parans, and Elliott, Amy M. Binder jet printed WC infiltrated with pre-made melt of WC and Co. United States: N. p., 2019. Web. doi:10.1016/j.ijrmhm.2019.105137.
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. Binder jet printed WC infiltrated with pre-made melt of WC and Co. United States. https://doi.org/10.1016/j.ijrmhm.2019.105137
Cramer, Corson L., Aguirre, Trevor G., Wieber, Natalie R., Lowden, Richard Andrew, Trofimov, Artem A., Wang, Hsin, Yan, Jiaqiang, Paranthaman, M. Parans, and Elliott, Amy M. Fri . "Binder jet printed WC infiltrated with pre-made melt of WC and Co". United States. https://doi.org/10.1016/j.ijrmhm.2019.105137. https://www.osti.gov/servlets/purl/1607097.
@article{osti_1607097,
title = {Binder jet printed WC infiltrated with pre-made melt of WC and Co},
author = {Cramer, Corson L. and Aguirre, Trevor G. and Wieber, Natalie R. and Lowden, Richard Andrew and Trofimov, Artem A. and Wang, Hsin and Yan, Jiaqiang and Paranthaman, M. Parans and Elliott, Amy M.},
abstractNote = {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·m1/2.},
doi = {10.1016/j.ijrmhm.2019.105137},
journal = {International Journal of Refractory and Hard Metals},
number = C,
volume = 87,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:

Citation Metrics:
Cited by: 22 works
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Figures / Tables:

Figure 1 Figure 1: Schematic of the processing sequence.

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