Abstract:

The ring?shape and disk-shape samples of modified polyethylene terephthalate （PET） wear-resistant composites were prepared through extrusion granulation and injection molding. The difference between their limit pressure-velocity（PV）values and tribological properties were investigated using the MPV-3 horizontal （ring） and MW?1A vertical pin?disk wear testing machine. The results indicated that when two types of samples reached an ultimate load， the ultimate pressure measured by the horizontal test method was less than that by the vertical test method with minimum values of 0.37 and 2.10 MPa， respectively. With increasing the rotating speed， the ultimate pressure of the former decreased much significantly. The limiting PV value of the former was less than that of the latter， and the fluctuation of its limiting PV value was smaller. The wear mechanism of the former belongs to the adhesive wear， whereas the latter has a large amount of wear debris spilling. The friction coefficient of the former is greater than that of the latter with the maximum values of 0.305 and 0.28， respectively. However， the wear of the former is smaller than that of the latter with the minimum values of 2 mg and 3 mg， respectively. The experimental results obtained from MPV-3 horizontal wear test system and MWW-1A vertical wear test system on the modified PET are different to some degree. However， the friction coefficient trends obtained from these two systems are the same. Under certain conditions， the vertical pin?disk test can replace the horizontal wear test to provide a basis for the rapid selection of sliding bearing materials.

Key words: modified polyethylene terephthalate, ring sample, ring and disk sample, limiting pressure?velocity value, trib?ological property