ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Ultra-high molecular weight polyethylene (UHMWPE) was surface treated by nitrogenplasma immersion ion implantation (PIII), with the main aim of improving its wear resistance.Accelerating voltages (U) between 15 and 30 kV, fluences (F) between 1×1017 and 3×1017 cm-2 andfluence rates (FR) between 3×1013 and 7×1013 cm-2 s-1 have been applied. XPS was used tocharacterise the surface chemical composition and structure. Changes induced in the surfacemechanical properties like hardness (H), reduced modulus (E) and in the tribological property ofvolume loss upon uniform wear test (V) were studied by nanoindentation and multipass wearmeasurements. The evolution of surface topography was followed by measuring the meanroughness (Ra). The macroscopic temperature (T) developed during the PIII-treatment was alsostudied.Incorporation of N and O took place into the surface layer. With the increase of U thesurface N-content tended to decrease. The bulk plasmon loss energy of the C 1s peak increasedfrom 20 eV up to about 25 eV, suggesting densification and the formation of amorphoushydrogenated carbon nitride-like layer. H, T and Ra increased, and V decreased upon PIII treatment,while E either decreased or increased depending on the actual process parameter set applied. In theparameter range studied Hmax, Emax and Ra,max values have been observed at Umax, Fmax and FRmin.Vmin and Tmax have been observed at Umax, Fmin and FRmax, suggesting that the thermal effect is adominant factor in determining the extent of reduction in the wear rate
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.537-538.255.pdf
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