The Development of Hydrogen-free DLC-coated Valve-lifter
Date Published: 2007-04-16
Paper Number:2007-01-1752
DOI: 10.4271/2007-01-1752
Citation:
Mabuchi, Y., Hamada, T., Izumi, H., Yasuda, Y. et al., "The Development of Hydrogen-free DLC-coated Valve-lifter," SAE Technical Paper 2007-01-1752, 2007, doi:10.4271/2007-01-1752.
Due to its lower friction property, a hydrogen-free diamond-like carbon coating (DLC) obtained by an ion-plating physical vapor deposition (PVD) process as an amorphous carbon film (a-C) was applied to an engine valve lifter to reduce mechanical losses. The effect of the a-C coating on reducing friction was evaluated with an engine motoring tester using actual engine parts. To meet the specifications of the valve lifter, a study was made of the typical topography of the a-C coating surface profile and the effect of the film thickness against abrasive wear.
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