Authors:
Axel Müller-Köhn (Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Germany),
David Werner (Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Germany),
Tamara Aleksandrov Fabijanić (University of Zagreb, Croatia),
Ivan Jeren (Alfa Tim d.o.o., Croatia)
Abstract:
Water and cellulose-ether-based extrusion of hardmetals give the opportunity of an environmentally friendly processing. Furthermore, water as a solvent significantly reduces the demands in occupational safety and also costs in suction systems and drying processes.Use of water requires specific binders and additives to achieve the desired processing behavior of extrusion feedstocks as well as the necessary hardmetal properties after sintering. Additionally, water removal during drying of extruded parts demands well controlled conditions to ensure shape retention and defect free green parts.In this presentation necessary organics and processes for a successful feedstock preparation and extrusion will be shown. As an example, it was possible to apply submicron (d50 < 1 µm) WC-10 Co and binder free, nano scaled WC powders. Finally, resulting material properties of extruded and sintered parts will be demonstrated.
DOI:
https://doi.org/10.59499/WP225371900