MODERN METHODS IN POWDER METALLURGY OF ALLOYS, INTERMETALLICS AND COMPOSITES

1 NOVÁK Pavel
Co-authors:
1 Průša Filip 2 Jaworska Lucyna
Institutions:
1 University of Chemistry and Technology, Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague, Czech Republic; panovak@vscht.cz
2 The Institute of Advanced Manufacturing Technology, Wroclawska 37A, 30-011 Krakow, Poland; lucyna.jaworska@ios.krakow.pl
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1619-1624
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
24 views / 2 downloads
Abstract

Nowadays, powder metallurgy (PM) is used in many industrial applications. Conventional PM processes, such as cold pressing and sintering are used frequently in series production due to nearly waste-free use of initial materials and limited or no requirements on further processing by machining. However, these simple processes do not bring significant improvement of mechanical properties and also keep relatively high levels of residual porosity. In production of highly demanding materials, such as high-strength alloys, intermetallics or special composites, modern methods of powder metallurgy are under rapid development. Among powder metallurgy techniques used for powder production, mechanical alloying, which allows for the production of nanocrystalline alloys and intermetallics, composites or oxide dispersion strengthened (ODS) materials, plays very important role. Among the sintering methods, Spark Plasma Sintering (SPS) process became a leading tool because of extremely short sintering times, as well as reduced sintering temperature. Thanks to these facts, the unique properties of nanocrystalline powders can be preserved. Currently, there exist interesting variants of SPS, such as High Pressure SPS and hybrid devices combining SPS and induction heating. In production of intermetallics, there is also a possibility to use the Self-propagating High-temperature Synthesis (SHS) process. In these processes of reaction synthesis, energy is supplied to the compressed mixture of pure metallic powders or other precursors by heating or by electric discharge. In this paper, the applications of the above described methods are presented on aluminium alloys, titanium- and iron-based intermetallics and aluminide-ceramics composites.

Keywords: Powder metallurgy; mechanical alloying; spark plasma sintering; SHS
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