title: [Joint prostheses components of warm-forged and surface treated Ti-6Al-7Nb alloy].
abstract: In 1978 development of a TiAl alloy with the inert alloying element niobium was initiated. In 1984, the optimal composition was found to be Ti-6Al-7Nb (Protasul-100). This custom-made alloy for implants has the same alpha/beta micro-structure and equally good mechanical properties as Ti-6Al-4V. The corrosion resistance of Ti-6Al-7Nb is better than that of pure titanium and Ti-6Al-4V, due to the very dense and stable passive layer. Since 1985, highly stressed anchoring stems of various hip prosthesis designs have been manufactured from hot-forged Ti-6Al-7Nb/Protasul-100. Polished surfaces of hip, knee or wrist joints made of Ti-6Al-7Nb intended to articulate with polyethylene are surface-treated by the application of a very hard, 3-5 microns thick titanium nitride coating (Tribosul-TiN), or by oxygen diffusion hardening (Tribosul-ODH) to a depth of 30 microns.
authors.affiliation: Sulzer Medizinaltechnik, F+E Biomaterialien, Winterthur, Schweiz.
authors.forename: M
authors.initials: M
authors.lastname: Semlitsch
authors.forename: H
authors.initials: H
authors.lastname: Weber
authors.forename: R M
authors.initials: RM
authors.lastname: Streicher
authors.forename: R
authors.initials: R
authors.lastname: Schön
mesh_terms: D000497:Alloys; D000535:Aluminum; D006801:Humans; D007595:Joint Prosthesis; D009556:Niobium; D011474:Prosthesis Design; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium
chemical_list: D000497:Alloys; D009556:Niobium; D000535:Aluminum; D014025:Titanium
vernacular_title: Gelenkprothesen-Komponenten aus warmgeschmiedeter und oberflächenbehandelter Ti-6Al-7Nb-Legierung.