STUDY OF STRUCTURAL AND SELECTED MECHANICAL/PHYSICAL PROPERTIES OF METAL POWDERS

1 ZEGZULKA Jiří
Co-authors:
1,2 JEZERSKÁ Lucie 3 LIPTÁKOVÁ Tatiana 2 HLOSTA Jakub 1 NEČAS Jan
Institutions:
1 VSB - Technical University of Ostrava, ENET center, Laboratory of Bulk Materials, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic, EU, jiri.zegzulka@vsb.cz
2 VSB - Technical University of Ostrava, Faculty of Mechanical Engineering, Institute of Transportation, 17. listopadu 15/2172, 708 33, Ostrava, Czech Republic, EU
3 University of Žilina, Faculty of Mechanical Engineering, Department of Materials Engineering, Univerzitna 1, 010 26 Žilina, Slovak Republic, EU, tatiana.liptakova@fstroj.uniza.sk
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
1457-1462
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
355 views / 114 downloads
Abstract

Study of structural and mechanical physical properties of metal powders is important considering the processes in powder metallurgy. The procedural behavior of copper, iron and aluminum powders depends on many parameters. Therefore metal powders are most thoroughly characterized with size, shape and distribution of particles. In this research work the attention is paid not only to properties of individual particles, but also their collective, volume mechanical and physical quantities such as flowability, aeration of powders or compression. For the samples of copper, iron and aluminum powder has been determined particle size distribution, particles shape and surface topography of the sample using the EDF Z profile (extended depth of field) in connection with their mechanical and physical properties. The smooth, spherical aluminum particles show without one degree, the angle of internal friction so called "Ideal bulk material", unlike the iron powder with grains of rugged structure with internal friction angle of 43°. These way defined Fe particles with distinct ruggedness of surface show a low degree of compressibility or any other method of formation. In the field of aeration it is difficult fluidisable powder. This demonstrates not only the material classification into group B according to Geldart, but also the aeration test result itself. 3D microscopic evaluation of copper powder particles shape has been defined as micro leaf-shaped. The Cu sample corresponds with pronounced compressibility 4.6%.

Keywords: metal powders, particle shape, angle of internal friction

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