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No.1(2006)15.Tribological Behavior of High Energy Ion-irradiated Ultra High Molecular Weight Polyethylene
Shohei Taniguchi, Masayuki Sekiguchi, Yasuhito Kinjo, Noriyuki Miyazaki
In order to improve the tribological property of ultra high molecular weight polyethylene (UHMWPE), the UHMWPE substrates were irradiated with Si ions. The beam energies were 1.5 and 3.0 MeV at a fluence range of 0.5×1014-1×1015ions/cm2. The friction coefficient and wear resistance of the UHMWPE substrates were measured using ball-on-disk wear testing. The ion-irradiated substrates were analyzed using secondary ion mass spectroscopy (SIMS)and Raman spectroscopy. It was found that the friction coefficient of ion-irradiated substrates at a fluence of 5×1014 or 1×1015 ions/cm2 was lower than that of un-irradiated substrate. Furthermore, the wear resistance was improved at a fluence of 1×1015ions/cm2. The hardness of the irradiated substrates increased with an increase of ion fluence. analysis by SIMS and Raman spectroscopy suggested that an amorphous carbon was formed in the surface layer by ion-irradiation.
Keywords
UHMWPE, ion irradiation, tribology, hardness, diamond like carbon