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Potential industrial applications of Al-based quasicrystals: plasma sprayed vs. HVOF sprayed coatings

Published online by Cambridge University Press:  17 March 2011

S.M. Lee ,
E. Fleury ,
J.S. Kim ,
Y.C. Kim ,
D.H. Kim ,
W.T. Kim  and
H.S. Ahn
S.M. Lee
Affiliation:
Korea Institute of Industrial Technology, Inchon, Korea
E. Fleury
Affiliation:
Yonsei University, Center for Noncrystalline Materials, Department of Metallurgical Engineering, Seoul, Korea
J.S. Kim
Affiliation:
Yonsei University, Center for Noncrystalline Materials, Department of Metallurgical Engineering, Seoul, Korea
Y.C. Kim
Affiliation:
Yonsei University, Center for Noncrystalline Materials, Department of Metallurgical Engineering, Seoul, Korea
D.H. Kim
Affiliation:
Yonsei University, Center for Noncrystalline Materials, Department of Metallurgical Engineering, Seoul, Korea
W.T. Kim
Affiliation:
Chungju University, Department of Physics, Chungju, Korea
H.S. Ahn
Affiliation:
KIST, Tribology Research Center, Seoul, Korea
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Abstract

Quasicrystalline coatings with various aluminum based systems were deposited onto 304 stainless steel substrates using two thermal spraying techniques; plasma spraying and high velocity oxy-fuel spraying. The friction and wear performances of the coatings were evaluated using two different testing devices, varying testing conditions and counterpart materials. Values of the friction coefficient were found to be strongly dependent on the testing devices and the counterpart materials, with values ranging from 0.15 to 0.4. In testing conditions corresponding to high sliding velocity, this study showed that the contact problem was posed over a third body system due to the formation of an intermediate layer. Values of the coefficient of friction were found to be approximately the same for all coating layers regardless of the thermal spraying techniques used, however, larger differences were obtained in the wear performance. The tribological properties were also evaluated at high temperature. It is noted that quasicrystal coating layers exhibit better friction and wear performances at 450oC than at room temperature. In comparison to potential coating candidate such as Cr2O3 for piston rings in automotive engines, tribological property of quasicrystalline coating layers seems to be promising one, however, wear performance need to be improved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K15.2
Copyright
Copyright © Materials Research Society 2001

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