Cold Spray Technology from Academic Research to the Marketplace
Hamid Assadi, Professor of Metallurgy, Tarbiat Modares University, Tehran
Friday, May 25, 2012, 3:30pm
This seminar is part of the Jones Seminars on Science, Technology, and Society series.
Performance of materials, especially in demanding environments, often depends on their surface properties. Accordingly, coating and surface modification technologies such as thermal spraying have become of central importance in materials engineering. A most basic presumption in thermal spraying is that the particles of the spray material have to be melted in order to fuse with a surface upon impact and subsequent solidification. This may now be refuted in view of the serendipitous invention of the cold spray process, where melting and solidification appear to play no role in bonding and deposition; instead, bonding occurs as a result of high-velocity impact and severe deformation of particles in the solid state. By means of cold spray, oxidation, structural, and compositional changes, almost all inherent problems associated with thermal spraying can be alleviated. These unique characteristics have attracted much attention from both academia and industry, especially within the past ten years or so, as indicated by a continually growing number of patents and publications, including a few textbooks, and an increasing number of companies engaging in equipment manufacturing, part production, or in-house research, e.g., in USA, Canada, Germany, Russia, and Japan. The presentation will aim to provide an overview on cold spray technology, describing the underlying principles of particle acceleration as well as mechanisms of particle bonding, and featuring working examples of its application, e.g., in the production of aircraft parts to frying pans.
About the Speaker
Dr. Hamid Assadi is Professor of Metallurgy at Tarbiat Modares University, Tehran. He studied Materials Engineering at Shiraz University, and received his Ph.D. in Materials Science and Metallurgy from University of Cambridge in 1996. Ever since he has been visiting different institutions in Germany, mostly Helmut Schmidt University where he worked with Germany’s pioneer research group in the field of cold spray. He is currently a guest researcher at Max Planck Insitut für Eisenforshcung, Düsseldorf.