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Dive into the research topics where Alex Dommann is active.

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Featured researches published by Alex Dommann.


Surface & Coatings Technology | 2001

The smoothness, hardness and stress in titanium nitride following argon gas cluster ion beam treatment

Anthony J. Perry; S.J. Bull; Alex Dommann; Markus Michler; B.P. Wood; David Rafaja; Jesse N. Matossian

The surface smoothing of TiN coatings, deposited by CVD or PVD methods, by argon ion clusters comprising a few hundred to a few hundred thousand atoms and carrying a single positive charge has been confirmed. In addition, the present work has shown that there was no change in the mechanical condition, nanohardness or residual stress, of the PVD coatings after treatment. In contrast, the nanohardness in the near-surface region of the CVD TiN coating was increased but, remarkably, there was no concomitant increase in residual stress. A comparison is made with the established effects of classical single ion implantation on the near-surface properties of TiN where a high compressive residual stress is developed if the ion energy lies beyond a threshold value. It was concluded that only a fraction of the atoms in the cluster impact the surface and the vast majority of argon atoms move sideways. It appears to be generic that the smaller clusters are responsible for the increase in hardness as well as the well-known lateral sputtering effects associated with the technology. Larger clusters do not carry enough energy per atom to cause such effects and their energy is dissipated in the substrate as heat.


Surface & Coatings Technology | 2000

The surface damage in titanium nitride associated with lateral sputtering by argon cluster ions

Anthony J. Perry; S.J. Bull; Alex Dommann; David Rafaja; B.P. Wood; Markus Michler

The surface smoothing of TiN coatings, deposited by CVD or PVD methods, by argon ion clusters comprising some 2000 atoms and carrying only a single positive charge has been confirmed. In addition, the present work has shown that there was no change in the mechanical condition, nanohardness or residual stress, of the PVD coatings. In contrast, the nanohardness in the near-surface region of the CVD TiN coating was increased but, remarkably, there was no concomitant increase in residual stress. A comparison was made with the established effects of ion implantation on the near-surface properties of TiN where a high compressive residual stress is developed if the ion energy lies beyond a threshold value. It was concluded that the vast majority of argon atoms from the clusters move sideways on impacting the sample surface, leading to the well-known lateral sputtering effects associated with the technology, and causing limited surface damage.


Journal of Materials Science: Materials in Medicine | 2006

Clinical applications of glass-ceramics in dentistry

Wolfram Höland; Volker Rheinberger; Elke Apel; Christian Van 't Hoen; Marlies Höland; Alex Dommann; Marcel Obrecht; Corinna Mauth; Ursula Graf-Hausner


Materials Transactions | 2002

Influence of Low Oxygen Contents and Alloy Refinement on the Glass Forming Ability of Zr52.5Cu17.9Ni14.6Al10Ti5

Andreas Kündig; Daniel Lepori; Anthony J. Perry; Sebastian Rossmann; Andreas Blatter; Alex Dommann; Peter J. Uggowitzer


Archive | 2001

Casting of amorphous metallic parts by hot mold quenching

Andreas Kündig; William L. Johnson; Alex Dommann


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2004

High aspect ratio micro mechanical structures made of bulk metallic glass

A.A. Kündig; Alex Dommann; William L. Johnson; Peter Uggowitzer


Archive | 2003

Embossing die for fabricating high density interconnects and method for its fabrication

Philippe Steiert; Gerhard Staufert; Alex Dommann; Andreas Kündig; Peter J. Uggowitzer


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2006

Oxygen impurity sequestering in amorphous Zr–Al–Ni–Cu–Ti alloys by scandium addition

Anthony J. Perry; Andreas A. Kündig; Marlies Höland; Alex Dommann


Archive | 2004

Prosthesis and method for the production thereof

Peter Uggowitzer; Alex Dommann; Daniel Rüfenacht; Andreas Kündig; Jörg Löffler


Archive | 2003

Alloy for components with an amorphous structure and method for the production of said alloy

Peter J. Uggowitzer; Andreas Blatter; Alex Dommann; Andreas Kündig; Sebastian Rossmann

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B.P. Wood

Los Alamos National Laboratory

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William L. Johnson

California Institute of Technology

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David Rafaja

Freiberg University of Mining and Technology

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A.A. Kündig

École Polytechnique Fédérale de Lausanne

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Andreas A. Kündig

École Polytechnique Fédérale de Lausanne

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