Aqueous Hard Metals
PN III P1 1.1 PD 2019 0295
Project Manager
Mentor
Contract Authority
Contractor
Objectives:
2. Kneading of aqueous milled samples and subsequent sintering of kneaded and extruded compacts.
Expected results:
– WC Co powders with suitable chemical composition and without hard agglomerates;
– compacts sintered from powders milled in aqueous medium situated in the biphasic region (WC + Co);
– a homogeneous mixture of aqueous milled powder and plasticizer usable for extrusion;
– sintered compacts of plasticizer and powder mixture situated in the biphasic zone (WC + Co);
– published scientific papers.
Results:
– by adjusting the pH of an aqueous environment, the appearance of friable agglomerates can be favoured
– the use of an anti-foaming agent having in its composition alkyl polyalkylene glycol ether inhibited the formation of foam and limited the loss of a significant amount of powder
– due to the large specific surface area, the drying of such powders requires a protective atmosphere to avoid oxidation
– spraying aqueous suspensions with a paraffin emulsion in their composition prevents the oxidation of particles and favors the formation of spherical agglomerates
– for samples ground in aqueous medium, drying in slightly oxidizing atmosphere gives better results.
– replacing the conventional grinding medium with water could easily be used industrially with minor modifications to conventional technology.
– changing the grinding medium does not influence the structural and morphological characteristics of these samples, as revealed by the measurements performed.
– the higher amount of residual moisture in the sample ground in aqueous medium suggests that the drying step must be adapted to the grinding medium.
From the point of view of the objectives regarding the publication of the results, the target was the publication of an ISI article and participation in 1-2 conferences. Within this project, the dissemination of the results obtained by completing the stages completed up to this point were materialized through 2 oral presentations at the International Conference on Advances in Engineering and Management – ADEM 2020 and the International Conference on Innovative Research – ICIR Euroinvent 2022, 2 papers published in Advances in Engineering and Management and Archives of Metals and Metallurgy. The work and results obtained within this project, presented at the International Conference on Innovative Research 2022, were awarded with the “Best Oral Presentation” distinction. Taking into account these from the point of view of scientific publications and the visibility of the results, the proposed objectives of this project have been fulfilled.
Data contract end: August 31st, 2022
Project duration: 24 months
Total value from budget: 246,256.00 RON
Year 2020: 63,091.00 RON
Year 2021: 108,363.00 RON
Year 2022: 74,802.00 RON
Contact:
horea.chicinas@stm.utcluj.ro
Department of Materials Science and Engineering
Technical University of Cluj-Napoca
103-105 Muncii Avenue 400641 Cluj-Napoca
Tel: +40 728 868 016