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The role of different high energy ball milling conditions of molybdenum powder on the resulting particles size and morphology

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METAL 2019 Lucie_Dyckova_final.pdf (1.087Mb)
Date
2019-05-24
Author
Dyčková, Lucie
Casas Luna, Mariano
Torres Rodríguez, Jorge Alberto
Dyčka, Martin
Jech, David
Dvořák, Karel
Deák, Andréa
Čelko, Ladislav
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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
granulometry, high energy ball milling, milling parameters, molybdenum, particle size
Persistent identifier
http://hdl.handle.net/11012/184690
Document type
Peer reviewed
Document version
Postprint
Source
Metal 2019. 2019, p. 1463-1469.
https://metal2019.tanger.cz/files/uploads/02//METAL2019_Conference_Proceedings_Content.pdf
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  • Charakterizace materiálů a pokročilé povlaky 1-06 [53]
  • Technologie hmot a dílců AdMaS [12]
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