Original scientific paper

TRIBOLOGICAL BEHAVIOUR OF TUNGSTEN-DOPED DLC COATED GEARS

Boris Kržan ; Centre for tribology and technical diagnostics
Mitjan Kalin ; Centre for tribology and technical diagnostics
Jože Vižintin ; Centre for tribology and technical diagnostics

Abstract

Abstract
The development of new transmissions and gearboxes is characterized by increasing levels of torque and power, improved efficiency, increased life expectancy, prolonged service intervals, reduced amount of lubricant, and more stringent noise and environmental requirements. The environment, as a new factor in the design process, increases the focus on product improvements that are designed to avoid environmental problems before they occur. Surface coating is one of the future technologies for improving performance of case hardened gears.
A main limiting factor to extend the use of hard coatings to machine component application is the lack of knowledge how these inert coatings perform under lubricated conditions, using today’s lubricants, originally designed for the steel/steel contact situations. The influence of ester based lubricant on scuffing capacity of WC-containing DLC coated spur gears was evaluated in a non-standard FZG test procedure. The properties of the formulated ester based lubricant were investigated in comparison with the conventional mineral gear oil. The results show that under present conditions W-DLC coated gears could provide satisfactory wear resistance for moderate loads.

Keywords

FZG gear wear test; coating by magnetron sputter deposition; tungsten (W); tungsten and diamond like carbon coating; mineral base oil; sinthetic base oil

Hrčak ID:

29332

URI

https://hrcak.srce.hr/29332

Publication date:

30.8.2008.

Article data in other languages: croatian

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