Barylski Adrian, Swinarew Andrzej S, Aniołek Krzysztof, Kaptacz Sławomir, Gabor Jadwiga, Stanula Arkadiusz, Waśkiewicz Zbigniew, Knechtle Beat
Faculty of Science and Technology, Institute of Materials Engineering, University of Silesia in Katowice, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland.
Institute of Sport Science, The Jerzy Kukuczka Academy of Physical Education, Mikołowska 72A, 40-065 Katowice, Poland.
Polymers (Basel). 2020 Jul 28;12(8):1676. doi: 10.3390/polym12081676.
This research investigated the effect of irradiation with an electron beam energy of 10 MeV in doses of 26-156 kGy on polytetrafluoroethylene (PTFE) with a 15% and 20% graphite additive. The research has shown that mechanical (compression strength, hardness, and Young's modulus) and sclerometric (coefficient of wear micromechanism and coefficient of resistance to wear) properties improve and tribological wear decreases as graphite content increases. Electron beam irradiation increases the degree of crystallinity of both materials to a similar extent. However significant differences in the improvement of all examined properties have been demonstrated for PTFE with higher (20%) graphite content subjected to the electron beam irradiation. This polymer is characterized by higher hardness and Young's modulus, reduced susceptibility to permanent deformation, higher elasticity, compression strength, and above all, a nearly 30% reduction in tribological wear compared to PTFE with a 15% graphite additive. The most advantageous properties can be obtained for both of the examined composites after absorbing a dose of 104 kGy. The obtained results hold promise for the improvement of the operational life of friction couples which do not require lubrication, used for example in air compressors and engines, and for the possibility of application of these modified polymers. In particular PTFE with 20% graphite content, in the nuclear and space industry.
本研究调查了能量为10 MeV的电子束以26 - 156 kGy的剂量辐照含15%和20%石墨添加剂的聚四氟乙烯（PTFE）的效果。研究表明，随着石墨含量增加，机械性能（抗压强度、硬度和杨氏模量）和硬度测量性能（磨损微观机制系数和耐磨系数）得到改善，摩擦磨损减少。电子束辐照使两种材料的结晶度提高程度相近。然而，对于含较高（20%）石墨含量且经电子束辐照的PTFE，在所有检测性能的改善方面已显示出显著差异。与含15%石墨添加剂的PTFE相比，这种聚合物具有更高的硬度和杨氏模量，对永久变形的敏感性降低，弹性更高，抗压强度更高，最重要的是摩擦磨损降低近30%。在吸收104 kGy的剂量后，两种检测的复合材料均可获得最有利的性能。所得结果为改善例如空气压缩机和发动机中使用的无需润滑的摩擦副的使用寿命以及这些改性聚合物的应用可能性带来了希望。特别是含20%石墨含量的PTFE，在核工业和航天工业中。
