New surface modification for Ti-6Al-7Nb alloy: oxygen diffusion hardening (ODH) |
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| Authors: | R M Streicher H Weber R Sch?n M Semlitsch |
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| Affiliation: | SULZERmedica, Department of Medical Engineering, Winterthur, Switzerland. |
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| Abstract: | PVD-TiN coating and N+ implantation of Ti-6Al-7Nb alloy resulted in surface hardening to a depth of less 3 microns. The new oxygen diffusion hardening (ODH) treatment increased the hardness gradually to 50 microns. PUD-TiN showed an improvement in the tribological properties, while N+ implantation increased the PE wear rate. The wear rate of the ultrahigh-molecular-weight as well as the friction coefficient were reduced to one-half of the values achieved with the combination of CoCrMo-alloy when paired against the ODH-treated surface. In pairing with ZrO2-containing bone cement the ODH-treated surface showed only a minimal reaction. |
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