Sliding components

Diamor® coated sliding components in lubricated environments

Diamor® coated camshaft to reduce valve train friction
© Fraunhofer IWS Dresden
Diamor® coated camshaft to reduce valve train friction
Diamor® coated piston pins to reduce piston friction
© Fraunhofer IWS Dresden
Diamor® coated piston pins to reduce piston friction
Diamor® coated balls for industrial switch valves
© Fraunhofer IWS Dresden
Diamor® coated balls for industrial switch valves

Diamor® coatings offer two advantages for sliding components in lubricated environments: wear protection and friction reduction. Wear protection is in particular provided by the super hard ta-C coating if the lubricating film (temporarily) fails or abrasive particles (chips, soot, foreign particles) are formed in contact zone. Friction reduction occurs under mixed friction and marginal lubrication conditions with various lubricants. The ta-C coatings with water based environmentally friendly lubricants proved particularly beneficial. In some cases the achievable friction is extremely low (“super lubricity”).

The most successful applications of Diamor® coatings include automotive components:

  • valve train components such as camshafts, valve lifters, cam followers
  • piston group components such as piston rings and piston pins
  • gears in gearbox transmissions and axle drives
  • fuel pump components such as pump pistons and nozzle needles

In addition, the coatings are successfully applied on various machine components. An example is process valve balls.