Research Article
True Stability of Lubricants Determined Using the Ball-on-Disk Test
Figure 5
Surface topography of the wear tracks on the disk lubricated by glycerol or glycerol-water mixture. (a, d) fixed point condition and circular geometry, (b, e) migrating point condition and spiral geometry, and (c, f) fixed point-variable speed condition and circular geometry.
| (a) Fixed point; 188 µm2 (wear area) |
| (b) Migrating point; 350 µm2 |
| (c) Fixed point-variable speed; 588 µm2 |
| (d) Fixed point; 1664 µm2 (wear area) |
| (e) Migrating point; 354 µm2 |
| (f) Fixed point-variable speed; 2188 µm2 |