Influence of Dissolved Oxygen Content on the Properties of Aqueous Milled WC-Co Powders

The research aims to develop a novel and safer milling route to produce Hard Metals. Considering the risks associated with milling fine particles under organic solvents, especially the increased fire and explosion risks, we propose milling under aqueous milling media to diminish the risks associated with fire hazards, while maintaining the oxidation level at a minimum. The samples were sintered in an industrial sintering oven under vacuum at 1380°C subsequent to milling and drying. The characterisation of the materials has been done by X-ray diffraction, scanning electron microscopy, particle size analysis, optical microscopy, and a magnetometer. The obtained results indicate that appropriate properties of the powders after milling and drying as well as the desired biphasic (Co-WC) phases were obtained after sintering, thus proving the feasibility of such a route and diminishing specific fire hazards.

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This work was supported by a grant from the Romanian National Authority for Scientific Research, CNCS - UEFISCDI, project number PN-IIIP1-1.1-PD-2019-0295. Besides this, the infrastructure available from the European Development Fund and the Romanian Government through the Competitiveness Operational Programme 2014-2020, project ID P 34 466, MySMIS code 121349, contract no.5/05.06.2018 is highly acknowledged.