Tribology of ultra-high molecular weight polyethylene disks molded at different temperatures |
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| Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. University of Technology and Life Sciences, Institute of Mathematics and Physics, PL-85796 Bydgoszcz, Poland;2. Departament de Fìsica Fonamental, Universidad de Barcelona, Avenida Diagonal 647, E-08028 Barcelona, Spain;3. Kazimierz Wielki University, Faculty of Mathematics, Physics and Technical Sciences, Chodkiewicza 30, PL-85867 Bydgoszcz, Poland;4. Technical University, ul. ??gska 20, 87-800 W?oc?awek, Poland;5. Department of Research and Development, NuOrtho Surgical, Inc., at the Advanced Technology & Manufacturing Center, University of Massachusetts Dartmouth, Fall River, MA 02723, USA;6. UMDI-Facultad de Ciencias, Universidad Nacional Autónoma de México Campus Juriquilla, MX-76230 Querétaro, Mexico;7. Tribochemistry Consulting, Salt Lake City, UT 84117, USA;8. Pawe? Wlodkowic University College in P?ock, Al. Kilińskiego 12, 09-402 P?ock, Poland;1. Materials Metrology Division, INMETRO, 25250-020 Duque de Caxias, RJ, Brazil;2. Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;3. Program of Metallurgical and Materials Engineering, Universidade Federal do Rio de Janeiro – UFRJ, 21949-900 Rio de Janeiro, RJ, Brazil;1. Centro de Microscopia, UFMG, Belo Horizonte, MG, Brazil;2. Departamento de Física, ICEx, UFMG, Belo Horizonte, MG, Brazil;3. Divisão de Metrologia de Materiais, INMETRO, Duque de Caxias, Brazil;4. Instituto de Física, UFRJ, Rio de Janeiro, Brazil;5. LabSem/CETUC, PUC-Rio, Rio de Janeiro, Brazil;6. DISSE – Instituto Nacional de Ciência e Tecnologia de Nanodispositivos Semicondutores, CNPq/MCT, Brazil |
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| Abstract: | 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. |
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