Recherche

Afficher tous les résultats pour

Accueil

Personne

Ludger Weber

Cette personne n’est plus à l’EPFL

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (62)

Infiltration of tin bronze into alumina particle beds: influence of alloy chemistry on drainage curves

Andreas Mortensen, Ludger Weber, Alain Léger

The wetting of angular alumina particle preforms by Cu-Sn alloys is investigated by means of pressure infiltration experiments conducted at 1150 A degrees C, using a system enabling dynamic and precise measurements of the metal volume injected into the pre ...

Springer Verlag2014

Qualitative link between work of adhesion and thermal conductance of metal/diamond interfaces

Ludger Weber, Christian Monachon, Georg Schusteritsch, Efthimios Kaxiras

We report Time-Domain ThermoReflectance experiments measuring the Thermal Boundary Conductance (TBC) of interfaces between diamond and metal surfaces, based on samples consisting of [111] diamond substrates with hydrogen or with sp2 carbon surface terminat ...

Amer Inst Physics2014

Thermal boundary conductance between refractory metal carbides and diamond

Ludger Weber, Christian Monachon

The thermal boundary conductance (TBC) between thin films of Cr, Mo, Nb and W and diamond substrates has been measured using time domain thermoreflectance before and after a high-vacuum heat treatment at 800 degrees C for 2 h. While no signs of carbide for ...

Elsevier2014

The ESPRI project: astrometric exoplanet search with PRIMA I. Instrument description and performance of first light observations

Ludger Weber, Yvan Michellod

Context. The ESPRI project relies on the astrometric capabilities offered by the PRIMA facility of the Very Large Telescope Interferometer for discovering and studying planetary systems. Our survey consists of obtaining high-precision astrometry for a larg ...

Edp Sciences S A2013

Influence of diamond surface termination on thermal boundary conductance between Al and diamond

Ludger Weber, Christian Monachon

The effect of diamond surface treatment on the Thermal Boundary Conductance (TBC) between Al and diamond is investigated. The treatments consist in either of the following: exposition to a plasma of pure Ar, Ar:H and Ar:O, and HNO3:H2SO4 acid dip for vario ...

American Institute of Physics2013

Composite material comprising a precious metal, manufacturing process and use of such a material

Andreas Mortensen, Ludger Weber, Senad Hasanovic, Reza Tavangar Hamzehkolaei

Composite material combining: - a precious metal or an alloy containing a precious metal, - and a boron-based ceramic having a melting point above that of said precious metal and a density at most equal to 4 g/cm3. ...

2012

Capillarity in pressure infiltration: improvements in characterization of high-temperature systems

Willy Dufour, Andreas Mortensen, Ludger Weber, Raphaël Charvet, Alain Léger, Claudio Bacciarini, Noelia Rojo Calderon

In the pressure infiltration of metal matrix composites, molten metal is injected under external pressure into a porous preform of the reinforcing material. Equilibrium capillary parameters characterizing wetting for this process are summarized in plots of ...

Springer Verlag2012

Solid solubility of germanium in silver

Ludger Weber, Hamed Kazemi

The solid solubility of germanium in silver has been measured in the temperature range of 520 K to 913 K via measurements of density and of electrical conductivity of two near-eutectic Ag-Ge alloys. The atomic fraction of germanium in solid solution varied ...

Elsevier2012

Platinum based alloys

Ludger Weber

An article made of an alloy of the general formula Pt1-a-bMa(B1-xMdx)b in which i) M stands for one or a mixture of metallic element(s) of the group Zr, Ti, Fe, Ni, Co, Cu, Pd, Ag, Al ii) Md stands for one or a mixture of several metalloids of the group Si ...

2012

Thermal boundary conductance of transition metals on diamond

Ludger Weber, Christian Monachon

An experimental process that was used to obtain a direct measurement of Thermal Boundary Conductance (TBC) between a diamond substrate and several transition metals, deposited by sputtering, is described. Using Time-Domain ThermoReflectance (TDTR), the cri ...

2012

Influence of sample processing parameters on thermal boundary conductance value in an Al/AlN system

Ludger Weber, Christian Monachon, Mohamad Hojeij

The influence of sample processing parameters on the thermal boundary conductance (TBC) between aluminum and aluminum nitride has been investigated by transient thermoreflectance. An evaporated Al layer on the polished substrate yielded a TBC at ambient of ...

American Institute of Physics2011

Influence of the elastic properties of the phases on the coefficient of thermal expansion of a metal matrix composite

Martin Vetterli, Ludger Weber, Reza Tavangar Hamzehkolaei

Copper matrix composites reinforced with low thermal expansion ceramic particles, i.e. SiO2, AIN and diamond, in the range of ceramic volume fractions between 0.55 and 0.85 have been prepared by gas pressure infiltration and are characterized by their coef ...

Elsevier2011

Thermal conductivity and interfacial conductance of AlN particle reinforced metal matrix composites

Andreas Mortensen, Ludger Weber, Christian Monachon, Masahiro Kida

Aluminum nitride (AlN) particle reinforced metal-matrix-composites produced by pressure infiltration are characterized in terms of their thermal conductivity. The composites are designed to cover a wide range of phase contrast between the dispersed particl ...

American Institute of Physics2011

Effective hydrogen diffusion coefficient for solidifying aluminium alloys

Michel Rappaz, Ludger Weber, Milan Felberbaum

An effective hydrogen diffusion coefficient has been calculated for two solidifying Al - 4.5 wt.% Cu and Al - 10 wt.% Cu alloys as a function of the volume fraction of solid. For this purpose, in situ X-ray tomography was performed on these alloys. For eac ...

Elsevier2011

Influence of reinforcement contiguity on the thermal expansion of alumina particle reinforced aluminium composites

Andreas Mortensen, Ludger Weber, Reza Tavangar Hamzehkolaei, Ghodratollah Roudini

Pore-free composites combining alumina particles within a matrix of pure aluminium are produced by pressure infiltration, varying systematically the degree of the contiguity, beta, of the ceramic phase by sintering prior to infiltration. The thermal expans ...

2010

Influence of processing route on electrical and thermal conductivity of Al/SiC composites with bimodal particle distribution

Ludger Weber

Al/SiC composites with volume fractions of SiC between 0.55 and 0.71 were made from identical tapped and vibrated powder preforms by squeeze casting (SC) and by two different setups for gas pressure infiltration (GPI), one that allows short (1-2 min) liqui ...

Springer US2010

Processing of Ag-Cu alloy foam by the replication process

Andreas Mortensen, Ludger Weber, Etienne Combaz, Vincent Laporte, Frédéric Diologent, Fabien Duc

Particulate reinforced material ...

2009

In situ flow stress of pure aluminium constrained by tightly packed alumina fibres

Andreas Mortensen, Ludger Weber, Benedikt Moser, Andreas Rossoll

The in situ matrix flow stress of continuous fibre-reinforced aluminium is measured in tension along the fibre axis. We use a new, tighter, estimate for the effect differential Poisson contraction between fibres and matrix and take into consideration nonli ...

Elsevier2009

Diamond-based Metal Matrix Composites for thermal Management - Potential and Limits

Ludger Weber, Reza Tavangar Hamzehkolaei

Diamond-based metal matrix composites have been made based on pure Al and eutectic Ag-3Si alloy by gas pressure infiltration into diamond powder beds with the aim to maximize thermal conductivity and to explore the range of coefficient of thermal expansion ...

Trans Tech Publications Ltd, Laublsrutistr 24, Ch-8717 Stafa-Zurich, Switzerland2009

Mechanical behaviour of diamond reinforced metals

Ludger Weber, Reza Tavangar Hamzehkolaei

Diamond reinforced metals with a diamond content of 55-60 vol.% were made by gas driven liquid metal infiltration. They were characterized with regard to their stiffness, strength and fracture toughness as a function of diamond particle size and matrix all ...

2009

Page 2 sur 4