Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...
Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...
Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...
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JUNE 26 MONDAY MORNING<br />
ETCHC.MoM.-OR.4 TRIBO-MECHANICAL PROPERTIES OF CrAlN COATINGS<br />
DOPED WITH YTTRIUM AND ZIRCONIUM. M. Brizuela, D. González, A. García-Luis, P.<br />
Corengia. Fundación INASMET-Tecnalia, Paseo de Mikeletegi 2, 20009 San Sebastián, Spain<br />
The aim of this work is to study the influence of doping with Y and Zr on the mechanical and tribological<br />
behaviour of CrAlN coatings.<br />
CrAlN coatings doped with Y and Zr were prepared on high-speed steel (AISI M2) and Si (100) substrates<br />
by d.c. magnetron sputtering using a commercial equipment (CemeCon® CC800/8) provided<br />
of four targets, two of chromium, one of aluminium, and one of the doping material (yttrium or zirconium)<br />
in a mixture of argon and nitrogen. The influence of different deposition parameters (e.g.:<br />
Ar/N 2 ratio, temperature, doping target power,) on the chemical, mechanical and tribological properties<br />
was analysed.<br />
The mechanical properties of the films was evaluated with a Fischerscope H100 dynamic microprobe<br />
apparatus using a conventional Vickers indenter at loads up to a maximum of 10 mN, to minimise<br />
the influence of the underlying base material. Adhesion testing was carried out with a conventional<br />
VTT scratch test on films deposited on polished M2 steel samples. Critical loads for adhesion were<br />
calculated by optical observation at the first cohesive or adhesive failure of the coating. The friction<br />
and wear tests have been performed in a pin-on-disk apparatus against different counterpart materials<br />
(AISI 52100 steel and Ti6Al4V alloy). Friction coefficients were continuously recorded during the<br />
tests. Wear volume and surface morphology were evaluated on worn areas of coated discs and balls<br />
after testing by means of non-contact laser surface profilometry, scanning electron microscopy<br />
(SEM) and energy dispersive spectroscopy (EDS). Chemical and microstructural properties have<br />
been also investigated by EDS and SEM.<br />
The results show great differences when using different doping elements and deposition conditions.<br />
The role of the amount and type of doping element has been investigated. Hardness values up to 40<br />
GPa have been found in the case of CrAlN coatings doped with yttrium under certain deposition<br />
conditions. The tribological behaviour has also been studied and correlated with the chemical composition<br />
and mechanical properties.<br />
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