Search

Tribomechanical properties of ultrahigh molecular weight polyethylene (UHMWPE) composites filled with chopped glass fiber (CGF) functionalized by two silane-containing modifiers in order to increase the adhesion between the filler and a non-polar matrix have been investigated. A comparison between two commercially available adhesion promoters (Penta 1006 and KH550) was carried out, and their effectiveness was shown from the standpoint of increasing the wear resistance of composites (more than 2 times) in a wide range of loads and sliding velocities. [ABSTRACT FROM AUTHOR]

Mechanical and tribotechnical properties of UHMWPE composites filled with carbon fibers of various dimensions (nanometer, micrometer and millimeter) under various loads and sliding velocities (60 N × 0.3 m/s, 60 N × 0.5 m/s, 140 N × 0.3 m/s, 140 N × 0.5 m/s) were studied. It is shown that at the moderate triboloading conditions (60 N × 0.3 m/s) the nanofibers are most efficient fillers in the sense of providing highest wear resistance that is governed by their action as solid lubricant (wear resistance increases by 2.7 times). Under the severe tribotesting conditions (140 N × 0.5 m/s) long carbon fibers (l = 2 mm) exhibit highest efficiency since they bear the action of the compressive and shearing loads from the counterbody. In doing so, they protect the polymer composite surface from intense wear ensuring doubling of the wear resistance. [ABSTRACT FROM AUTHOR]

The key set of mechanical and tribotechnical properties of UHMWPE composites fabricated from polymer powder particles of different size (units and tens of microns) was measured and analyzed. It is shown that specimens of neat UHMWPE grades GUR4120 and GUR2122 are characterized by close values of wear resistance at mild triboloading parameters PV = 18 and 30 N m/s. Also, filled composites based on two polymer matrices with different initial powder sizes have almost identical wear resistance at all used triboloading conditions. The role of permolecular structure and crystallinity degree in development of tribochemical processes at the friction surface in terms of providing tribotechnical properties of UHMWPE composites is discussed. [ABSTRACT FROM AUTHOR]

Polymer-polymeric UHMWPE composites filled with polypropylene grade 21030 powder were fabricated: (i) by hot isostatic pressing (HIP) of two-component powder mixtures; and (ii) by 3D-printing through fused deposition modeling (FDM) from pellets obtained by extrusion mixing and consequent milling of the same polymer component mixture. It is shown that the formed permolecular structure plays a decisive role in providing tribotechnical and mechanical properties of extrudable polymer-polymeric composites with ultrahigh-molecular-weight polyethylene matrix. [ABSTRACT FROM AUTHOR]

Mechanical and tribotechnical properties of UHMWPE composites filled with short carbon fibers (CF) under dry sliding friction and various testing conditions (PxV) were studied. It is shown that loading of short carbon fibers into UHMWPE gives rise to increase of strength properties of the composites (elasticity modulus, yield strength) by the factor of 1.5-2 and wear resistance up to 2 times. It is suggested that high-strength wear-resistant UHMWPE composites loaded with short carbon microfibers can be used in tribounits under severe conditions (at loads up to 140 N and sliding velocities up to 0.5 m/s). [ABSTRACT FROM AUTHOR]

The mechanical and tribotechnical characteristics of UHMWPE based composites filled with basalt microparticles and fibers under dry friction and various test conditions (P•V) have been studied. It is shown that from the position of increasing resistance to wear under dry sliding friction, basalt particles and fibers during reinforcement of the UHMWPE matrix are equally effective at moderate loading and speed: the wear resistance of composites has increased by 1.5 times with a content of 10 wt. % filler while the coefficient friction -- in 1.8 times. Mechanisms of wear of polymer composites based on UHMWPE filled with particles/fibers of basalt under different conditions of triboloading have been discussed. [ABSTRACT FROM AUTHOR]