Abstract
Plasma source ion implantation target temperatures are estimated by measuring the diffusion coefficient of nitrogen in the target and subsequently deducing the temperature. The diffusion coefficient is measured by comparing measured nitrogen concentration profiles to Monte Carlo simulations. Auger results indicated the affected zone of implantation is about 0.5 μm thick. Surface Knoop hardness improved from 400 to 900 (for 1- g applied load). Wear behavior was studied using a pin-on-disk wear tester. The wear data show a factor of 30 increase in wear lifetime (1 μm wear depth was chosen as the failure criterion). Comparison shows that the wear behavior of Ti-6AI- 4V ELI (extra low interstitial) is as good as that of cobalt-chromium alloy, another candidate for surgical applications.
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