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Friction reduction and wear resistance of electro-co-deposited inorganic fullerene-like WS2 coating for improved stainless steel orthodontic wires

Published online by Cambridge University Press:  31 January 2011

Meir Redlich ,
Alex Gorodnev ,
Yishay Feldman ,
Ifat Kaplan-Ashiri ,
Reshef Tenne ,
Niles Fleischer ,
Menachem Genut  and
Noam Feuerstein
Meir Redlich
Affiliation:
Department of Orthodontics, Faculty of Dental Medicine, Hadassah-Hebrew University, Jerusalem 91120, Israel
Alex Gorodnev
Affiliation:
NanoMaterials Ltd., Nes Ziona 74140, Israel
Yishay Feldman
Affiliation:
Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
Ifat Kaplan-Ashiri
Affiliation:
Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
Reshef Tenne*
Affiliation:
Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
Niles Fleischer
Affiliation:
NanoMaterials Ltd., Nes Ziona 74140, Israel
Menachem Genut
Affiliation:
NanoMaterials Ltd., Nes Ziona 74140, Israel
Noam Feuerstein
Affiliation:
NanoMaterials Ltd., Nes Ziona 74140, Israel
*
a)Address all correspondence to this author. e-mail: reshef.tenne@weizmann.ac.il
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Abstract

A new type of composite metal–nanoparticle coating that significantly reduces the friction force of various surfaces, particularly archwires in orthodontic applications, is demonstrated. The coating is based on electrodeposited Ni film impregnated with inorganic fullerene-like nanospheres of tungsten disulphide. The first encouraging tests have shown reduction of up to 60% of the friction force between coated rectangular archwires and self-ligating brackets in comparison with uncoated archwires. The coating not only significantly reduces friction of commercial archwires but also maintains this low value of friction for the duration of the tests in comparison to archwires coated with nickel film without the nanoparticles. The coated surfaces of the wires were examined by scanning electron microscopy equipped with energy dispersive analyzer and by x-ray powder diffraction methods before and after the friction tests. Using these analyses, it was possible to qualitatively estimate the state of the Ni+IF-WS2 coating before and after the friction test compared to Ni coated wires without IF-WS2.

Keywords

CoatingElectrodepositionNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 2909 - 2915
Copyright
Copyright © Materials Research Society 2008

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