title: New surface modification for Ti-6Al-7Nb alloy: oxygen diffusion hardening (ODH).
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.
authors.affiliation: SULZERmedica, Department of Medical Engineering, Winterthur, Switzerland.
authors.forename: R M
authors.initials: RM
authors.lastname: Streicher
authors.forename: H
authors.initials: H
authors.lastname: Weber
authors.forename: R
authors.initials: R
authors.lastname: Schön
authors.forename: M
authors.initials: M
authors.lastname: Semlitsch
mesh_terms: D003343:Corrosion; D008422:Materials Testing; D008970:Molecular Weight; D013499:Surface Properties; D014025:Titanium
chemical_list: C070282:Ti-6Al-7Nb alloy; D014025:Titanium