Abstract
Surface modification of ultra high molecular weight polyethylene (UHMWPE) was explored using ion implantation with different dosages (1 × 1015 - 1 × 1017 ions cm -2) of nitrogen. The modified surfaces were characterised by SEM, nanoindentation and tribological tests. The experimental results showed that ion implantation can significantly increase the surface hardness of UHMWPE. However, the improvement in wear resistance of the modified UHMWPE is highly dose dependent. Compared with the untreated material, the low dose implanted UHMWPE exhibited a three fold improvement in wear resistance, while the high dose ion implanted material showed hardly any improvement although it possessed the highest hardness.
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