| WANG Xinfei,XING Zhaoyang,LI Aodi,ZHANG Bin,WANG Xin.Tribological Study of Plasma-treated Nitrile Rubber Surface[J],54(3):101-109 |
| Tribological Study of Plasma-treated Nitrile Rubber Surface |
| Received:March 06, 2024 Revised:September 30, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.03.008 |
| KeyWord:NBR surface modification tribological properties contact angle plasma treatment |
| Author | Institution |
| WANG Xinfei |
Research and Development Center for Advanced Lubrication and Protective Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| XING Zhaoyang |
Research and Development Center for Advanced Lubrication and Protective Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| LI Aodi |
Research and Development Center for Advanced Lubrication and Protective Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| ZHANG Bin |
Research and Development Center for Advanced Lubrication and Protective Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| WANG Xin |
AECC Beijing Institute of Aeronautical Materials, Beijing , China |
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| Abstract: |
| NBR is characterized by oil and abrasion resistance, good elasticity, good air permeability, etc. It is an indispensable material for manufacturing seals, and needs to be in frequent contact with lubricants and metals. Therefore, the coefficient of friction and wear performance are the key characteristics that determine the performance of NBR products. However, the tribological properties of plasma-treated rubber surfaces are not explored fully in the current research. The innovation of this work focuses on the variety of plasma atmospheres and different plasma treatment time. This innovation can, on the one hand, make a more comprehensive comparison of the differences in the treatment results of NBR rubber with common atmosphere conditions, and on the other hand, provide clues for exploring the mechanism of the modification treatment. With NBR as the substrate material, Ar, Ar+O2, Ar+N2, and Ar+C2H2 in different ratios were used as the plasma source to modify the surface of NBR, and the effects of different treatment time of 10 min and 30 min on the surface properties of NBR were comparatively studied. The experimental samples were NBR rubber blocks of certain sizes. The surface temperature of NBR did not exceed 80 degrees Celsius throughout the modification experiment. The experiments were performed by a DC power supply with 100 V and 10 A of current in a chamber of about 10‒2 vacuum magnitude. The rotational friction mode was used for 60 minutes of atmospheric friction experiments at a load of 3 N, a rotational speed of 300 r/min, and a rotational radius of 4 mm. A steel ball with a radius of 6 mm was used as the friction pair. Scanning electron microscope (SEM), contact angle detector, Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectroscopy (XPS), and friction tester were used to characterize and analyze the surface morphology of the samples, the size of the contact angle, the information of the functional groups and elemental valence, and the friction coefficient, etc. The results showed that different atmosphere plasma sources were used to modify the surface of NBR at different rates. The test results indicated that different atmosphere plasma had obvious effect on the surface morphology of NBR, and the degree of change on the friction coefficient was obviously different, in which Ar+C2H2 (4∶1) plasma treatment showed a stable low friction coefficient of about 0.266, and also showed the minimum water contact angle of about 50°. In conclusion, plasma sources with different atmospheres and ratios have different energies after ionizing and impacting the NBR surface with different forces, resulting in differences in surface morphology. Hydrogen in acetylene-containing plasma may play a role in lowering the coefficient of friction compared to oxygen-and nitrogen-containing atmospheres, and infrared spectra show that different ratios of carbon-hydrogen bonding are correlated with the type of plasma source. The lower water contact angle after plasma treatment with an acetylene atmosphere with higher hydrogen content may be related to the higher forces between polar covalent bonds and water molecules in the NBR surface groups. The experimental results provide ideas and guidance for realizing low friction performance with NBR in practice. |
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