Tribological behavior of biomedical gradeUHMWPEwith graphite‐based fillers againstEBM‐Ti6Al4V pinunder various lubricating conditions

Abstract

In this work, the wear behavior of the mechanical coupling between the biomedical polymer ultrahigh molecular weight polyethylene (UHMWPE) and the titanium-aluminum-vanadium alloy pin (Ti4Al6V) manufactured by electron beam melting (EBM) is investigated. Pure and oxidized graphite fillers is added to the UHMWPE matrix to boost the wear resistance. The tribological test is performed in dry and under the action of various lubricating media (distilled water [DW], simulated synovial fluid [SSF], and natural bovine serum [NBS]) in order to investigate their effects on wearing. The physical-mechanical characterization results show a progressive increase in wear resistance of more than 60% in the nanocomposite (UHMWPE/GO) with the addition of paraffin oil (PO) compared to the UHMWPE and higher under NBS lubricant (more than 80%). The observed wear action is reduced in the order Dry > DW > SSF ≥ NBS, thereby lowering the debris production.

Chemically expanded graphite-based ultra-high molecular weight polyethylene nanocomposites with enhanced mechanical properties

“…10. The results show that for 5 wt % MPS-CEG, the wear rate was reduced by 99%, which is notably higher than the reduction obtained using GO or rGO [56,57]. For the 5 wt% CEG, this reduction was less significant at 83%.…”

Influence of rotation speed on abrasive wear behavior of the UHMWPE in lubrication environment

“…At the end of the test, the UHMWPE pins were cleaned, blown dry and weighed in the same manner to obtain the mass of the UHMWPE pins after wear. Through calculation of the difference in mass before and after wear to obtain the mass loss of UHMWPE, and then, the wear rate K can be calculated by Equation (): 10 where K is the wear rate, mm 3 /(N·m); ∆m is the mass difference of the sample before and after wear, g; ρ is the density of UHMWPE material, g/mm 3 ; L is the sliding distance, m; N is positive pressure, N. And the mass loss and wear rate of the lower metal counterparts were obtained in the same way. To ensure the accuracy of the experimental results, we performed at least three tests on each group.…”

“…At present, a common approach adapted by researchers to study the tribological properties of UHMWPE materials is using clean water, seawater and other pure lubricant to set up the environments 8–10 . The results show that for UHMWPE working in lubricating medium, the speed affects the tribological properties of the material by changing the stability of the lubricating film 11 .…”

Crystallization and Melting Behavior of UHMWPE Composites Filled by Different Carbon Materials

“…In order to improve the properties of UHMWPE, UHMWPE composites filled by carbon fibers (CF) [5][6][7][8][9][10][11][12][13], carbon nanotube (CNT) [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], and graphene oxide (GO) [33][34][35][36][37][38][39][40][41][42][43] were reported. Despite the excellent performance of these nanocomposites, the high cost of these fillers restricted the widely use of the UHMWPE composites.…”