Tribology of ultra-high molecular weight polyethylene disks molded at different temperatures
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- 作者：Taku Aoike ; Daisuke Yokoyama ; Hiroki Uehara ; Takeshi Yamanobe ; Tadashi Komoto
- 关键词：Ultra-high molecular weight polyethylene ; Tribology ; Wear track ; Friction coefficient
- 刊名：Wear
- 出版年：2007
- 出版时间：28 February 2007
- 年：2007
- 卷：262
- 期：5-6
- 页码：742-748
- 全文大小：511 K
文摘
Tribological characteristics of ultra-high molecular weight polyethylene (UHMW-PE) disks molded at 130–190 °C were studied. The highest crystallinity was obtained for the sheet molded at 130 °C, but crystallinity decreased with increasing molding temperature. Beyond 150 °C, the resultant crystallinity reached a constant level. The dynamic friction coefficients of these UHMW-PE disks were measured using a ball-on-disk friction tester. The friction coefficient decreased with increasing number of rotations in the early stage of the measurement, and achieved at an equilibrium level, independent of the molding temperature. The steady-state friction coefficient was 0.04 for the disk molded at 130 °C and increased with increasing molding temperature. The disks molded at 150–190 °C always had a steady-state friction coefficient of 0.065. The surface deformation of each disk was evaluated from the observation of the resultant wear track. Analyzing the relationship between the above friction coefficient and width of the wear track enabled us to interpret the tribological mechanism generated in this study.