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Prediction of particle size for water atomised metal powders: parameter study
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.ORCID iD: 0000-0003-0864-3679
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2012 (English)In: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 55, no 1, 45-53 p.Article in journal (Refereed) Published
Abstract [en]

This work aims to investigate how some significant atomising parameters influence the mass median particle size d50 of water atomised metal powders. More specifically, these were water pressure, melt flowrate, water jet angle, liquid metal viscosity and surface tension. Existing models for the prediction of d50 during water atomisation were reviewed. The selected models were fitted and compared with atomising experiments of liquid iron containing 0.5–4.4%C. Experimental results and model calculations were used in a parameter study to investigate how the different parameters influenced d50. The effect on d50 was large for the water pressure, medium for the viscosity and low for the melt flowrate and surface tension. Model calculations indicate that the jet angle has a large effect on d50, which should be verified by additional studies. The model proposed by Bergquist (B. Bergquist: Powder Metall., 1999, 42, 331–343) showed the best agreement with the current experimental data.

Place, publisher, year, edition, pages
2012. Vol. 55, no 1, 45-53 p.
Keyword [en]
Powder metallurgy, Modelling, Water atomisation, Metal powder, Particle size
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-53622DOI: 10.1179/1743290111Y.0000000016ISI: 000302546300008OAI: oai:DiVA.org:kth-53622DiVA: diva2:470489
Note
QC 20120528Available from: 2011-12-29 Created: 2011-12-29 Last updated: 2017-12-08Bibliographically approved
In thesis
1. A Study of Factors Affecting the Particle Size for Water Atomised Metal Powders
Open this publication in new window or tab >>A Study of Factors Affecting the Particle Size for Water Atomised Metal Powders
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The production of metal powders by water atomisation is a well established process, which can be used to produce a wide range of particle sizes. A careful control of the particle size distribution is necessary, to atomise powders with a high quality and at a low production cost. Therefore, it is necessary to have a substantial knowledge of the relation between operational parameters and the particle size, to be able to produce water atomised metal powders with consistent and high yields.

The main purpose with this thesis was to increase the knowledge about factors which affect the mass median particle size (d50) for water atomised metal powders. The specific objectives with the study were to develop a theoretical d50 model and to investigate the relation between the particle size and the physical properties of the liquid metal.

Pilot scale experiments for liquid iron showed that alloy additions of carbon and sulphur decreased the d50 value, at a maintained liquid steel temperature before atomisation. Moreover, it was indicated that the reduced particle size at increased %C and %S contents may be related to a decreased viscosity and surface tension of the liquid metal, respectively. An alternative explanation could be that raised superheats at increased carbon contents increased the total available time for atomisation, which may have contributed to a reduction of the d50 value.

The theoretical d50 model developed in this work showed a very good correlation to the current experimental data. The model considers the influence of surface tension, viscosity, melt stream diameter, water pressure, water jet angle and water to metal ratio. This model was further used to analyse how the d50 value was influenced by the viscosity and the surface tension. A reduced viscosity from 4∙9 to 2∙1 mPa s decreased the d50 value with 33%. In addition, the particle size was estimated to decrease with 21% by decreasing the surface tension from 1840 to 900 mN m-1.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 31 p.
Keyword
water atomisation, metal powders, particle size, modelling, viscosity, surface tension
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-94533 (URN)978-91-7501-395-4 (ISBN)
Presentation
2012-06-08, MAVES Konferensrum, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
Q 20120529Available from: 2012-05-29 Created: 2012-05-09 Last updated: 2012-05-29Bibliographically approved

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Eliasson, Anders

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