Influence of humidity on the tribological behaviour of W-alloyed C-based amorphous coatings
by Carlos Wagner Moura e Silva; José Roberto Tavares Branco; Albano Cavaleiro
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 5, No. 4, 2011

Abstract: The frictional behaviour of diamond-like carbon (DLC) coatings depends on either their chemical composition or the humidity ratio in the testing environment. In this research, C-based amorphous coatings were deposited with W addition of ?10% in reactive and non-reactive atmosphere, in an unbalanced magnetron apparatus. Reactive deposited coatings have approximately 29% H. Both coatings have hardness of 12 GPa and the scratch test critical load values were higher than 60 N. The coatings were tribological tested on a pin-on-disk machine under standard conditions and different relative humidity (RH %) of 30%, 50% and 80%. Both coatings showed the same frictional trend, i.e., friction coefficient increased with RH % value but, globally, H-containing films have lower friction than non-hydrogenated ones ([0.01-0.05] and [0.05-0.20]), respectively. Raman analysis of the worn tracks showed, in both cases, an increase of the G/D ratio of the two main characteristic peaks (G and D) of sputtered C-based coatings.

Online publication date: Wed, 14-Dec-2011

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Surface Science and Engineering (IJSURFSE):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email