Eric Rosset | University of Applied Sciences Western Switzerland (original) (raw)

Papers by Eric Rosset

These Ecole polytechnique federale de Lausanne EPFL, n° 731 (1988) Reference doi:10.5075/epfl-the... more These Ecole polytechnique federale de Lausanne EPFL, n° 731 (1988) Reference doi:10.5075/epfl-thesis-731Print copy in library catalog Record created on 2005-03-16, modified on 2016-08-08

Tribology Series, 1993

ABSTRACT

Journal of Materials Processing Technology, 2019

Tube drawing with a fixed plug is investigated experimentally and numerically in order to optimis... more Tube drawing with a fixed plug is investigated experimentally and numerically in order to optimise an industrial pass sequence. Tube drawings are performed on a laboratory drawing bench equipped with force, displacement and temperature sensors. The drawing limit of 316 LVM stainless steel (SS) tubes is determined by varying the plug position and the effect of lubricant is discussed. The numerical model relies on the precise die geometry measured using a contact method and on the mechanical behaviour of SS 316 LVM characterised by tensile tests between 20°C and 200°C on annealed tubes. The friction coefficients between tube and die and tube and plug are determined by FE modelling by comparing measured and simulated plug, die and drawing forces. The use of a solid lubricant together with the lubricating oil prevents stick and slip and lowers the friction coefficients. Friction is further decreased by preheating the die. The identified friction coefficients are discussed in terms of the classic Stribeck friction curves and lubrication is found to be in the hydrodynamic regime.

Tribology Series, 1996

ABSTRACT Export Date: 16 June 2009, Source: Scopus

MRS Proceedings, 1999

Tungsten CMP involves a synergistic interaction of electrochemical and tribological (wear) phenom... more Tungsten CMP involves a synergistic interaction of electrochemical and tribological (wear) phenomena. So far, numerous studies have been conducted using static electrochemical measurements as well as some polishing experiments. In this study, we present some results obtained from carrying out potentiodynamic measurements and tribological experiments in a reciprocating sphere-on-plate tribometer, which allowed a precise control of mechanical and electrochemical conditions. In addition, anodic current-time transient measurements were also used to characterize the kinetics of tungsten passivation reaction. These results indicate that the presence of an passive film is essential for wear of tungsten to take place.

Journal of Applied Electrochemistry, 1990

High rate anodic dissolution of Fe, Fel3Cr, Fe24Cr, Cr and AISI type 304 stainless steel is studi... more High rate anodic dissolution of Fe, Fel3Cr, Fe24Cr, Cr and AISI type 304 stainless steel is studied in NaC1 and NaNO3 using a flow channel cell with well-defined hydrodynamic conditions. The apparent valence for dissolution and the surface finish are investigated as a function of current density. Electrochemical etching experiments through photoresist masks are performed with type 304 stainless steel using NaNO3. The influence of current density on the shape and surface finish of the etch grooves and the uniformity of the attack between differently spaced grooves can be qualitatively explained from the electrochemical data obtained on flat electrodes.

The sliding wear and frictional behavior of Ni metal matrix composite coatings have been studied ... more The sliding wear and frictional behavior of Ni metal matrix composite coatings have been studied by using a reciprocating motion wear test rig. The effect of the heat treatment on structure and wear behavior is investigated. An attempt is made to elucidate the role of the interface between the particles and the matrix. Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) have been used to characterize the worn surfaces.

Wear, 1993

ABSTRACT Corrosion and tribocorrosion tests of iron in sulphuric acid at different concentrations... more ABSTRACT Corrosion and tribocorrosion tests of iron in sulphuric acid at different concentrations were performed in order to elucidate the relationship between corrosion and wear and the role of surface films. Coefficient of friction, material loss rates and surface morphology of iron rubbing against alumina were monitored in sulphuric acid solutions of concentrations ranging from 2 M up to 18 M.It was found that the material removal rate under tribocorrosion as a function of acid concentration reaches a maximum at 8 M. The simultaneous action of wear and corrosion may significantly affect the material removal mechanisms observed under static corrosion conditions. The films formed by corrosion products at the iron surface are responsible for surface smoothing.

ABSTRACT A single-pulse heating method for studying chemical surface reactions of extreme pressur... more ABSTRACT A single-pulse heating method for studying chemical surface reactions of extreme pressure additives is described. The method uses a single high intensity pulse of short duration in conjunction with highly sensitive surface analytical tools such as Auger electron spectroscopy and X-ray photoelectron spectroscopy for monitoring reaction products. The method was applied to the study of the reaction of dibenzyl disulphide with iron.

Tribology and Interface Engineering Series

Precision engineering, 1989

Electrochemical micromachining (EMM) through photoresist masks of SS304 and Phynox using a jet ce... more Electrochemical micromachining (EMM) through photoresist masks of SS304 and Phynox using a jet cell and a neutral NaNO 3 electrolyte is investigated. Results show that EMM is suitable for the shaping of highly corrosion-resistant alloys which are not readily ...

Si 3 N 4-TiN based multi-layer laminates exhibit differences in residual stress between individua... more Si 3 N 4-TiN based multi-layer laminates exhibit differences in residual stress between individual layers due to a variation of the thermal expansion coefficient between the layers. The residual stress distribution in these multi-layer laminates is known to improve the apparent macroscopic fracture toughness. In this work, the tribological behaviour of bulk, composites and multi-layers laminates are investigated. Si 3 N 4 bulk, Si 3 N 4 based composites with 10, 20 and 30 wt% TiN and different multi-layer laminates have been tested under dry conditions with reciprocal movement using a ball-on-block configuration. In particular, the influence of sliding directions with respect to the layer orientations has been investigated. The experimental results show that wear resistance increased with increasing TiN content in Si 3 N 4-TiN composites. However, multi-layer laminates exhibit an up to three times higher apparent fracture toughness, but do not show an improvement of wear resistance compared to composites.

Laser cladding of AlSn alloy onto a mild steel have been carried out. The laser source was a cont... more Laser cladding of AlSn alloy onto a mild steel have been carried out. The laser source was a continuous Nd-YAG. Due to similar boiling temperatures of feeding materials, cladded layers are free from porosity. Microstructural analyses show that aluminum and tin do not mix, except at the eutectic composition of 97% of tin. Eutectic compounds are shown. Direct cladding onto the steel produces intermetallic AlxFey layer. This layer is very hard. In order to avoid the formation of this layer, the steel can be pre-coated with nickel. Tribological behavior of the cladded layers is then analyzed, in comparison with an industrial material. Experimental Stribeck curves are plotted. It is shown that lubrication regimes do not change from industrial to laser cladded material. Running in behavior is tested. Results show that a tin layer on the surface of the AlSn laser alloy improve this running in behavior.