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Volume 5, Issue 5 Res. Rev. J Mat. Sci. 2017
ISSN: 2321-6212 Advanced Materials 2017
September 07-08, 2017
September 07-08, 2017 | Edinburgh, Scotland
Advanced materials & Processing
11th International Conference on
Low friction, wear resistant quasicrystalline coatings
Jean-Marie Dubois
University de Lorraine, France
Jozef Stefan Institute, Slovenia
Quasicrystals were discovered in 1982 by Shechtman, Nobel Prize in Chemistry 2011, and have since been the focus of intense
research regarding their atomic structure, their properties and potential usefulness. Among the few niches of application that
were sorted out so far is the possibility to use them as a low friction counterpart in mechanical devices. Typical friction coefficients
pointed out against hard steel is indeed about half that observed with conventional metallic metals or with hard steel sliding against
itself. Wear during short pin-on-disk tests is also very much reduced. The intrinsic brittleness of quasicrystals is however very much
detrimental to such an application, which could not be implemented on realistic devices. We came however to a totally different issue
in recent years when we could show that an appropriately prepared quasicrystalline coating can produce friction as low as 6% against
hard steel and sintered tungsten carbide whereas wear is negligible for extremely long pin-on-disk tests (i.e. lasting for at least 5 km),
see left hand side of the image. The talk will summarize our findings in this area and show how low friction is related to the specific
electronic structure of quasicrystals, which determines their surface energy. An overview on other characteristic application niches
of quasicrystals will be given.
Biography
Jean-Marie Dubois is a director of research emeritus at CNRS, France and a part time scientific adviser at Jozef Stefan Institute in Ljubljana, Slovenia. He has
dedicated a large fraction of his research efforts to promoting specific applications of quasicrystalline materials (tribology, adhesion, heat insulation) in parallel to his
fundamental studies of the atomic structure, electronic structure and electron transport properties of this new type of aperiodic matter.
Jean-Marie Dubois, Res. Rev. J Mat. Sci. 2017, 5:5
DOI: 10.4172/2321-6212-C1-005