|
|||||
|
|
Effect of irradiation modification above melting point on the wear resistance of polytetrafluoroethylene |
|
| Authors: | Sagin Abay Bekbolatovich Xiaojie Wang Xiuting Zheng Shuangquan Zhou Yao Huang Hong Xu I Skopincev Daming Wu Xiaolong Gao |
| Affiliation: | 1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China
The two authors put forward new ideas by reading a lot of literature, and wrote this paper through a lot of experiments and tests. We want to keep the symbol of the common author. Both authors have contributed so much to this work that it should be considered a joint effort. Contribution: Conceptualization (lead), Data curation (lead), Formal analysis (lead), Funding acquisition (equal), Investigation (lead), Methodology (equal), Project administration (lead), Validation (equal), Visualization (equal), Writing - original draft (lead), Writing - review & editing (equal);2. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China The two authors put forward new ideas by reading a lot of literature, and wrote this paper through a lot of experiments and tests. We want to keep the symbol of the common author. Both authors have contributed so much to this work that it should be considered a joint effort. Contribution: Data curation (lead), Formal analysis (lead), Funding acquisition (lead), Investigation (equal), Methodology (equal), Project administration (equal), Resources (lead), Validation (lead), Visualization (lead), Writing - original draft (lead), Writing - review & editing (lead);3. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Data curation (lead), Formal analysis (lead);4. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Formal analysis (lead), Funding acquisition (lead), Methodology (lead), Project administration (lead);5. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Data curation (lead), Formal analysis (lead), Software (lead), Supervision (lead);6. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Investigation (lead);7. Department of Processes and Devices in Chemical Technology, Moscow Polytechnic University, Moscow, Russia Contribution: Data curation (equal), Project administration (equal);8. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China |
| Abstract: | The cross-linked polytetrafluoroethylene (PTFE) and PTFE/carbon fiber (CF) composites were synthesized through electron beam irradiation in the molten state of PTFE at a controlled temperature of 340 ± 3°C under an inert gas atmosphere for this study. The wear resistance of raw (raw-PTFE), irradiated modified PTFE (RM-PTFE), and CF-reinforced PTFE composites were evaluated using a friction and wear testing machine. The testing was conducted under varying ambient temperatures and dynamic loads. After irradiation, the samples were sectioned into specific sizes for subsequent testing purposes. Under the test conditions of 4.64 MPa positive pressure, 800 rpm speed, and a duration of 300 s at 20°C, the wear amount of PTFE after irradiation modification is significantly reduced from 1.4103 mm to only 0.0233 mm, representing a remarkable reduction by a factor of 60. Similarly, under the test conditions of 4.64 MPa positive pressure, 200 rpm speed, and a duration of 300 s at 20°C, the friction coefficient of PTFE after irradiation modification is substantially decreased from an initial value of 0.13 to just 0.03. The observed improvement can be attributed to the transformation of PTFE's crystalline form into spherulite, accompanied by a significant enhancement in the degree of cross-linking within its molecular chain. The PTFE was supplemented with 10% CF prior to irradiation. Under the test conditions of a positive pressure of 4.64 MPa, rotation speed of 800 rpm, and a duration time of 300 s at 20°C, the wear amount of the composite material measured only 0.0007 mm, representing a reduction by a factor of 2000 compared to that observed for pure PTFE. This improvement can be attributed to the CF filler's high wear resistance properties and the composite's enhanced thermal conductivity. |
| Keywords: | electron beam irradiation irradiation modification mechanical properties PTFE wear |