Binder jet printed WC infiltrated with pre-made melt of WC and Co |
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| Affiliation: | 1. Energy & Transportation Science Division, Energy and Environmental Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, USA;2. Materials Science and Technology Division, Physical Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, USA;3. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;1. School of Physics, University of the Witwatersrand, South Africa;2. DST-NRF Centre of Excellence in Strong Materials, hosted by the University of the Witwatersrand, South Africa;3. Academic Development Unit (ADU), University of the Witwatersrand, South Africa;4. School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, South Africa;5. Pilot Tools (Pty) Ltd., Johannesburg, South Africa;6. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, South Africa;1. University of Applied Sciences and Arts Western Switzerland, CH-1950 Sion, Switzerland;2. Hilti Corporation, 9494 Schaan, Liechtenstein;1. Energy and Environmental Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, USA;2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA;1. GTP – Department of Materials Science and Engineering, IAAB, Universidad Carlos III de Madrid, 28911 Leganés, Madrid, Spain;2. CIEFMA – Department of Materials Science and Metallurgical Engineering, Universitat Politècnica de Catalunya - BarcelonaTech, 08019 Barcelona, Spain;3. Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya - BarcelonaTech, 08019 Barcelona, Spain |
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| 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. 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. |
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