About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Temporary Coating to Improve Part Integrity and Post-Sintering Surface Roughness of Binder Jet Printed Tungsten Carbide-Cobalt Parts |
Author(s) |
Pierangeli Rodriguez De Vecchis, Katerina Kimes, Drew Elhassid, Markus Chmielus |
On-Site Speaker (Planned) |
Pierangeli Rodriguez De Vecchis |
Abstract Scope |
Traditionally, tungsten carbide-cobalt (WC-Co) parts are manufactured by powder injection molding (PIM), but Binder Jet Printing (BJP) allows to create custom-shapes and complex geometries. Even though BJP of WC-Co has been achieved, the process is not ideal. The intrinsic complexity of WC-Co powders results in low-density (~20%) green parts, which tend to crack during handling before sintering and result in deformed parts after densification. This project proposes to evaluate three coatings (ExOne solvent binder 04, Cerita 983 runner wax from Paramelt Inc. and PIM Paraffin wax) that would protect the green part and ensure better integrity after sintering. Average surface roughness (Ra) performed via optical profilometry was chosen to evaluate distortion of the printed part. Results showed a significant reduction of Ra and its variation in all orientations for binder-coated samples in comparison with non-coated samples. Additionally, Archimedes density, volumetric shrinkage, microstructural characterization, and Rockwell A hardness were also compared. |