A new piston ring coating under the Goetze brand promises reduced wear, lower friction and greater scuff resistance under test conditions.
In rig tests, GDC60 – a galvanic coating with a higher and more evenly distributed nano-diamond content than the existing GDC50 product - reduced the friction coefficient up to 7 percent. First engine tests have shown the potential for wear reduction of up to 10 percent compared to GDC50 coatings, an improvement that will also prolong a better standard of oil distribution.
As cylinder pressures increase in modern two-stroke engines, greater scuff resistance is required - especially for the first compression ring.
“GDC60 will enable our customers to develop new, more efficient engines with higher cylinder pressures while staying with a familiar, well-proven ring coating technology,” commented Gian Maria Olivetti, chief technology officer, Federal-Mogul Powertrain.
Galvanic coatings are used for piston rings in around 90% of medium-speed engines and many low-speed engines, Peter Schmidt, head of application engineering, large bore engines, told guests at Federal-Mogul Powertrain’s technical day in Augsburg.
However, they are not used on MAN Diesel & Turbo’s cross-head piston rings as the engine developer prefers the self-lubricating and controlled wear effects of thermal sprayed coatings.
Federal-Mogul works with most if not all of the leading engine manufacturers and developers, providing a range of components from piston rings and cylinder liners to bearings and valve trains.
