INFLUENCE OF TOPOGRAPHY ON THE RUNNING-IN OF WATER-LUBRICATED SILICON-CARBIDE JOURNAL BEARINGS

Citation
P. Andersson et al., INFLUENCE OF TOPOGRAPHY ON THE RUNNING-IN OF WATER-LUBRICATED SILICON-CARBIDE JOURNAL BEARINGS, Wear, 201(1-2), 1996, pp. 1-9
Citations number
8
Categorie Soggetti
Material Science","Engineering, Mechanical
Journal title
WearACNP
ISSN journal
00431648
Volume
201
Issue
1-2
Year of publication
1996
Pages
1 - 9
Database
ISI
SICI code
0043-1648(1996)201:1-2<1:IOTOTR>2.0.ZU;2-P
Abstract
The study summarizes an experimental investigation on the running-in o f water-lubricated journal bearings and shaft sleeves made of 10 diffe rent commercial silicon carbide materials. In each test the sliding su rfaces became polished and the sliding conditions were transformed fro m boundary or mixed lubrication to full film lubrication within a rath er short sliding distance. The initial surface roughness strongly infl uenced on the initial dynamic coefficient of friction, and on the runn ing-in distance required to reduce the coefficient of friction from a level typical of boundary or mixed lubrication to a level typical of f ull film lubrication. The initial surface roughness of the shaft sleev e was more slowly removed than that of the bearing, and therefore the surface quality of the shaft rather than that of the bearing governed the running-in distance required for the polishing. The initial surfac e roughness of the bearing practically only influenced the dynamic coe fficient of friction at the beginning of the running-in procedure. In comparison with the influence of the surface roughness variations, the material properties of the silicon carbides studied had a limited inf luence on the running-in behaviour, which was principally related to a tribochemical surface polishing process.