THE ROLE OF DIFFERENT HIGH ENERGY BALL MILLING CONDITIONS OF MOLYBDENUM POWDER ON THE RESULTING PARTICLES SIZE AND MORPHOLOGY

1 DYČKOVÁ Lucie
Co-authors:
1 CASAS LUNA Mariano 1 TORRES RODRÍGUEZ Jorge Alberto 1 DYČKA Martin 1 JECH David 2 DVOŘÁK Karel 3 DEÁK Andrea 1 ČELKO Ladislav
Institutions:
1 Brno University of Technology, Central European Institute of Technology, Brno, Czech Republic, EU, lucie.dyckova@ceitec.vutbr.cz, mariano.casasluna@ceitec.vutbr.cz, jorgealberto.torresrodriguez@ceitec.vutbr.cz, martin.dycka@ceitec.vutbr.cz, david.jech@ceitec.vutbr.cz, ladislav.celko@ceitec.vutbr.cz
2 Brno University of Technology, Faculty of Civil Engineering, Brno, Czech Republic, EU, dvorak.k.@ceitec.vutbr.cz
3 Hungarian Academy of Sciences, Research Centre for Natural Sciences, TTK AKI, Budapest, Hungary, EU, deak.andrea@ttk.mta.hu
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1463-1469
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
46 views / 19 downloads
Abstract

High energy ball milling is a powder processing method in which the powder particle size can be decreased to micrometer size in a relatively short period of time. This method is based on the friction and the high energy kinetic collisions between the balls and the trapped powder particles. The milling process is influenced by many process variables such as mainly the rotational speed, ball to powder weight ratio and processing time. In the present study, high energy ball milling process was performed for molybdenum powder using a high energy ball mill under different milling conditions varying the: (i) rotational speed from 600 to 800 rpm, (ii) ball to powder weight ratio of 100:3 and 100:6, (iii) milling time in the range of 10 to 60 minutes, (iv) process control agent using polyethylene glycol, and (v) milling atmosphere under air or nitrogen. The used initial molybdenum powder was of globular morphology and 100 µm in particle size. The powders after milling were characterized by a scanning electron microscope (SEM) and a laser diffraction size analysis. The particle size of milled powders was decreased down to 1.1 µm. As the most effective ball to powder weight ratio was found 100:6 with the milling speed of 800 rpm. The milling time played a crucial role for the refinement of particles up to 45 min, where the further milling had negligible effect on the overall trend of particle size evolution.

Keywords: High energy ball milling, milling parameters, molybdenum, particle size, granulometry
Scroll to Top