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Tribological properties of quasicrystalline coatings

Published online by Cambridge University Press:  03 March 2011

S.S. Kang ,
J.M. Dubois  and
J. von Stebut
S.S. Kang
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (CNRS URA 159), Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France
J.M. Dubois
Affiliation:
Laboratoire de Science et Génie des Matériaux Métalliques (CNRS URA 159), Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France
J. von Stebut
Affiliation:
Laboratoire de Science et Génie des Surfaces (CNRS URA 1402), Ecole des Mines, Parc de Saurupt, F-54042 Nancy, France
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Abstract

Coatings of three different compositions (Al65Cu20Fe15, Al64Cu18Fe8Cr8, and Al67Cu9Fe10.5Cr10.5Si3) were realized by various thermal deposition techniques. They were studied in the as-deposited state and after annealing. In view of potential applications, these quasicrystalline coatings were examined from the point of view of tribology: friction and wear. Some basic components of friction such as roughness, plowing, and adhesion have been studied in scratch testing. The friction resistance of the coating is strongly dependent on its inherent porosity, hardness, and thickness. The damage of the coatings is essentially brittle though some ductile behavior is observed. Static indentation hardness is in the range 500–600 HV0.03 (5–6 GPa), whereas the scratch hardness varies from 1.4 to 2.4 GPa depending on the percentage of porosity. Friction coefficients (measured at constant load of 20 N) were found to be typically 0.07 and 0.20 for diamond (tip radius R = 0.79 mm) and AISI 52100 (radius R = 0.79 mm) indenters, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 10 , October 1993 , pp. 2471 - 2481
Copyright
Copyright © Materials Research Society 1993

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References

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