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3 International Journal of Applied Mechanics and Engineering

3 2002

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Tribological properties of the soft overlays for plain bearings

Lungu C. P., Iwasaki K., Takayanagi S., Ohkawa K.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

375-380

Sn matrix soft overlays for the three-layer plain bearings were prepared by ECR-DC hybrid sputtering. Overlays with Vickers hardness between 5-20Hv, measured at loads of 49mN, were obtained by using pure Sn and Ag-Sn composite targets with Ag/Sn target area ratios of 0.5/44.5 - 6/39. The hardness of the overlays across the wear scar exhibited progressive increase due to densification of coatings and work hardening during the sliding. The physical and mechanical properties of the overlays were also analyzed by optical microscopy (OM), scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and tribological tests were performed using a CSEM type ball-on-disk tribometer.

Tribological properties of environmetally friendly three-layer engine bearings

Norito A., Takayanagi S., Ohkawa K., Iwasaki K., Lungu C. P.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

263-268

Engine bearing performances were improved by forming overlays using only environmentally friendly materials Ag and C. Ag and Ag-C composite overlays were deposited onto Pb-free bronze layer on plain bearings by electron cyclotron resonance sputtering. Their physical and mechanical properties were analyzed by optical microscopy, scanning electron microscopy, electron-probe micro analysis, X-ray diffraction, and laser Raman spectroscopy. C within the overlay was identified to be a diamond-like carbon and found to be distributed uniformly. Seizure resistance was evaluated by rig test machine and excellent results were obtained for the overlay containing 1.7wt.%C. The damage was not observed on the bearing with this overlay after 100hr engine test.

Influence of graphite addition on the tribological properties of plain bearing overlays

Iwasaki K., Lungu C. P., Takayanagi S., Ohkawa K.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

351-356

Ag-C composite overlays of slide bearings for automotive use were prepared by ECR-DC hybrid sputtering with the use of Ag-graphite targets. Most part of the graphite was found to be transformed into amorphous diamond-like carbon. The obtained overlays showed excellent tribological properties; low and stable coefficient of friction, low wear rate and high seizure resistance. The optimum C concentration in Ag was found to lie around 1.5wt.%.