Effect of wear debris on wear in rolling-sliding motion

The effect of wear particles on wear was investigated using a four-ball extreme pressure lubricant test apparatus. The wear particles present in both filtered and unfiltered oil samples were examined using a duplex Ferrograph analyser and a bichromatic microscope. The wear track widths were measured for various wear modes and were found to increase if the wear debris was recirculated. The size of the wear particles increased with test duration.