Keyword: «carbon fibers»

This paper presents the results of comparative studies of the physical and mechanical properties of ultra-high molecular weight polyethylene and modified polymer composite materials (PCM) before and after bench full-scale tests at the climatic test site in Yakutsk. It is established that in the conditions of the sharply continental climate of Yakutia, ultra-high molecular weight polyethylene and a composite containing 5 wt. % of carbon fibers of the brand "Belum" are aging by the fourth month of exposure. In this regard, ultra-high molecular weight polyethylene was modified not only with carbon fibers to increase the physico-mechanical and tribotechnical parameters, but also a stabilizer of the SO-4 brand produced by NIOH SB RAS was introduced. Based on the conducted studies, it was found that the additional modification of the UHMWPE-UV composite with a stabilizer of the CO-4 brand leads to a slowdown in the photo-oxidative processes of the composite in the open air, which has a positive effect on the preservation of physical and mechanical parameters for a long time under the influence of adverse climatic factors. This fact allows us to predict the high performance of products made of the developed material in the conditions of the sharply continental climate of Yakutia.

This paper presents the data of physico-mechanical and tribotechnical studies of polymer composites based on polytetrafluoroethylene (PTFE) and carbon fillers of the UVIS-AK-P brand, depending on the production technology. The influence of various activation technologies, such as joint mechanical activation of components, activation by passing a powder composition through metal rolls, as well as the technology of plastic deformation of polymer blanks based on PTFE in order to improve the mechanical and tribotechnical performance of composites, are considered.

The paper presents the results of a study of the effect of carbon fibers and zirconium nanooxide on the properties of polytetrafluoroethylene. It is shown that the introduction of combined fillers leads to an increase in the hardness and compression of the polymer with a decrease in the deformation-strength properties. Tribological studies of composites with binary fillers showed an improvement in wear resistance by 1147 times relative to the polymer matrix and 2.1 times compared to the material containing a monofiller. Structural studies of the friction surface of composites were carried out by optical microscopy and IR spectroscopy.

The objects of study in this work were polymer composite materials based on polytetrafluoroethylene (PTFE) with fillers such as kaolin Al4[Si4O10](OH)8, carbon nanotubes (CNTs), and carbon fiber (CF). Filler modification methods were used, such as mechanical activation, ultrasonic (US) dispersion, and hybrid filling. The results of mechanical and tribological characteristics of new PCM compositions based on PTFE are presented. It has been established that the wear resistance of composites, compared to the wear resistance of the original PTFE, increases from 315 to 1090 times, depending on the content and type of filler.