title: Structural characterisation of oxygen diffusion hardened alpha-tantalum PVD-coatings on titanium.
abstract: Titanium substrates were coated with tantalum layers of 5 μm thickness using physical vapour deposition (PVD). The tantalum layers showed a (110)-preferred orientation. The coated samples were hardened by oxygen diffusion. Using X-ray diffraction the crystallographic structure of the tantalum coatings was characterised, comparing untreated and diffusion hardened specimen conditions. Oxygen depth profiles were determined by glow discharge spectrometry. The hardening effect of the heat treatment was examined by Vickers microhardness testing. The increase of surface hardness caused by oxygen diffusion was at least 50%.
authors.affiliation: Lehrstuhl für Werkstoffkunde und Werkstoffmechanik, Technische Universität München, Boltzmannstrasse 15, 85748 Garching, Germany. Electronic address: hertl@wkm.mw.tum.de.
authors.forename: C
authors.initials: C
authors.lastname: Hertl
authors.affiliation: Lehrstuhl für Werkstoffkunde und Werkstoffmechanik, Technische Universität München, Boltzmannstrasse 15, 85748 Garching, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Koll
authors.affiliation: Department of Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, 97070 Würzburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Schmitz
authors.affiliation: Lehrstuhl für Werkstoffkunde und Werkstoffmechanik, Technische Universität München, Boltzmannstrasse 15, 85748 Garching, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Werner
authors.affiliation: Department of Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, 97070 Würzburg, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Gbureck
mesh_terms: D004058:Diffusion; D006244:Hardness; D010100:Oxygen / Q000737:chemistry*; D013499:Surface Properties; D013635:Tantalum / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D013635:Tantalum; D014025:Titanium; D010100:Oxygen
keywords: Diffusion; Magnetron sputtering; Metal surface treatment; Oxidation; Physical vapour deposition; Surface hardening; Titanium