Novel Electro-Mechano-Chemical Method for Rapid Synthesis of Electroceramics

Andrzej Calka

University of Wollongong

A/Prof. Andrzej CalkaAndrzej Calka is Associate Professor of Materials Science and Engineering at School of Mechanical Materials and Mechatronics, University of Wollongong in Australia. He received his MSc (1972) and PhD (1978) from Warsaw University of Technology. His main research interests are Planar Flow Casting, Mechano-Chemical Synthesis and Plasma Materials ProcessingHe has published 177 publications which attracted 3889 citations [ISI Web of Knowledge; Science Citation Index Expanded] over the period 1974-2018. His publication in Nature (A.Calka and D.Wexler; Nature, vol.419, 2002, pp.147-151) sparked international interest in the new materials processing technology –Electric Discharge Assisted Mechanical Milling which currently is his major field of research. His h-index is 36. He delivers 36 invited and keynote lectures at major international conferences. He is Associate editor of Advanced Powder Technology journal and member of many steering committees.He is a member of the Engineering Materials Institute and Group Leader of the Special Materials and Advanced Research and Technology Group at the University of WollongongHe is a regular referee for 11 international journals and he has been invited as a reviewer of grant applications of many research institutions.He supervised 27 undergraduate, PhD and Master Degree students.

Abstract

Many functional materials are traditionally synthesized by slow reaction processes that are energy and time consuming. In the present world there is strong demand on development of modern materials and materials processing methods that could offer rapid reaction rates, energy efficiency and be environmentally safe.
The conventional method to prepare electroceramic and other ceramic materials is ceramic-powder-based processing, i.e., through solid-state reaction at high temperatures. This process has several disadvantages, such as high-temperature reaction, limited degree of chemical homogeneity, and low sintering ability. Therefore, during past years, several chemical-based processing routes, including freeze-drying, spray-pyrolysis, sol– gel, spray-drying, and pyrolysis of complex compounds, have been developed to prepare powders with more homogeneous composition, improved reactivity, and sintering ability at low temperatures. Recently, non-conventional processing methods such as mechanical alloying and mechano-chemical approaches have been used to create reactions between species. However in this method the reaction kinetics is very slow and processing time long. The objective of the present study is to investigate the application of an Electro-Mechano-Chemical (EMC)[1] technique to synthesize various electroceramics, in particular formation of nano-phases and characterize the structural, physical, and optical properties. By using EMC, high purity single phase multi-element oxides can be formed in as little as 0.1% of the processing time required in conventional solid-state techniques. An even more important feature of EMC is that the crystallite size of the synthesized compound is able to be reduced to nanometer size, by careful selection of electrical (voltage, current, total power) and mechanical (vibration frequency and amplitude) experimental parameters.
This presentation provides an overview of recent development of EMC method and it’s application in rapid synthesis of Perovskite ABO₃ type oxide ceramics.

References

1. A.Calka and D.Wexler, Nature, 419,(2002)147-151

Authors

Andrzej Calka (University of Wollongong)

Topic Areas

Energy Storage , Synthesis , Processing , Dielectric properties

Session

OS-8B » Symposium B - Innovative Synthesis & Processing (16:10 - Wednesday, 11th July, Aula Louis Roppe)

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