Role of Micro- and Nanofillers in Abrasive Wear of Composites Based on Ultra-High Molecular Weight Polyethylene

Abstract

The abrasive wear of pure UHMWPE as well as one filled with nanoand microparticles (fibers) were investigated. It was found that abrasive wear resistance of microcomposites (containing AlO(OH) and Al2O3microparticles) can grow up by 16-18 times in comparison with pure UHMWPE depending on the strength and size of the filler as well as abrasive grit. Nanofillers (AlO(OH) and carbon nanofibers (CNF) as well as SiO2and Cu nanoparticles) as opposed to microfillers can improve abrasive wear resistance of UHMWPE in a significantly less degree (up to 50 %). Abrasive wear resistance of nanocomposites weakly depends on the type of filler and is defined by the polymeric matrix (permolecular) and counter-face abrasive grit. The comparative analysis of the wear mechanisms of UHMWPE based micro-and nanocomposites under abrasive wear (fixed abrasive particles) and dry sliding friction is carried out.

Influence of laser power on tensile properties and material characteristics of laser-sintered UHMWPE

“…Due to its high molecular weight which induces a very high melt viscosity, UHMWPE parts cannot be produced easily by many conventional methods, such as extrusion and injection moulding, [12,13]. UHMWPE is processed by ram extrusion and compression moulding [14] with a reported density of 0.936 g/cm 3 , ultimate strength of 33.5 MPa and elongation of 380.4% [15].…”

Influence of Nano- and Microfillers on the Mechanical and Tribotechnical Properties of “UHMWPE-PTFE” Composites

“…This results from friction coefficient values of all studied composites (Table 1). 6), UHMWPE+10 wt.% PTFE+20wt.% AlO(OH) (7) To clarify the relationship between the character of wear under dry sliding friction, formed permolecular structure and the type of filler in the composites with "UHMWPE + 10 wt.% PTFE" hybrid matrix, the wear track surfaces at the steady-state wearing stage were studied as well as the pattern of permolecular structure of the composites (Fig. 2).…”

“…At design of the solid lubricating composites some dispersed fillers, such as graphite or molybdenum disulfide, are added into polymeric matrix in order to extend the application area of antifriction composites in highly loaded friction units when liquid or pasty lubricants cannot stand hard operation conditions [1][2][3][4][5][6][7][8]. In paper [9] polytetrafluoroethylene (PTFE) to have low shear resistance, low adhesion interaction, an ability to form a transfer film at a counterface, and the lowest friction coefficient in comparison with other commercially-available polymeric materials was added into UHMWPE as a solid lubricant.…”

Micromorphology and mechanical properties of UHMWPE/CNF composites under accelerated aging

“…[15][16][17][18][19][20] Among the many fillers, carbon nanofibers (CNF) is a very attractive nano-filler for polymer composites because of their strong chemical stability, high temperature resistance, corrosion resistance, high mechanical properties, and low cost. [21][22][23] Sui [24] studied the effects of untreated and pretreated carbon nanofibers on the mechanical and tribological properties of UHMWPE and high density polyethylene (HDPE) composites. The results show that the crystallinity, tensile strength, and modulus of the composites increase at first and then decrease with the addition of carbon nanofibers, and the friction coefficient of the composites decreases with the addition of untreated carbon nanofibers.…”