基于改性PET的极限PV值测试及摩擦学性能比较研究

采用挤出造粒与注射成型法制备了改性聚对苯二甲酸乙二醇酯（PET）耐磨复合材料圆环样品和圆盘样品，首先，在干摩擦条件下，分别采用MPV-3卧式磨损试验机和MWW-1A立式销?盘磨损试验机测试了其极限负荷，探讨了它们极限压力?速度（PV）值和摩擦学性能的差异。结果表明，当两种样品达到极限负荷时，卧式试验法所测得的极限压强小于立式试验法的极限压强，它们的最小值分别为0.37 MPa和2.10 MPa；随着转速的增大，前者的极限压强下降的程度相对较大；前者的极限PV 值小于后者的极限 PV 值，且前者的极限PV 值的波动性相对较小；前者的磨损机理表现为黏着磨损，而后者表现为大量的磨屑向外溢出；前者的摩擦因数大于后者的摩擦因数，最大值分别为 0.305 和 0.28；但是前者的磨损量相对后者较小，最小值分别为2 mg和3 mg。基于改性PET的MPV-3 卧式磨损试验系统和MWW?1A立式磨损试验系统所测得的实验结果有一定差异，但是两者所检测到的摩擦因数趋势相同，在一定的条件下，立式销盘试验可以代替卧式磨损试验而为简单迅捷地选择滑动轴承材料提供了依据。

Comparative Study on Limiting Pressure?velocity Test and Tribological Properties of Modified PET

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.