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Ludger Weber

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Publications associées (62)

Rigidity of diamond reinforced metals featuring high particle contents

Ludger Weber, Reza Tavangar Hamzehkolaei

Diamond/metal composites with diamond contents between 57 and 72 vol% have been produced by gas pressure assisted liquid metal infiltration using Ag-3 wt% Si and Al-2 wt% Cu as matrix. The experimental data cover a range of Young's moduli from 300 to 425 G ...

2009

Surface Modification of Diamonds in Diamond/Al-matrix Composites

Ludger Weber, Reza Tavangar Hamzehkolaei

Fe- or Mn-powders were mixed with the diamonds and the mixtures were heat treated under different gas atmospheres like hydrogen or argon gas and at varying temperatures in order to roughen the surface of the diamond particles. Subsequently the reaction lay ...

Trans Tech Publications2009

Prediction of flow structure and equilibrium bathymetry in an open channel bend with a very strong curvature

Koen Blanckaert, Ludger Weber

2008 Kubaba Congress Department and Travel Services2008

Measurement of damage evolution in continuous ceramic fibre-reinforced metals by acoustic emission

Andreas Mortensen, Ludger Weber, Benedikt Moser, Andreas Rossoll

Internal damage in uniaxial continuous alumina fibre-reinforced aluminium is measured by acoustic emission during tensile straining in the fibre direction. Over most of the loading history spatially uncorrelated fibre fragmentation occurs, consistent with ...

2008

High-temperature wettability of aluminum nitride during liquid metal infiltration

Andreas Mortensen, Ludger Weber, Maryam Bahraini Hasani, Masahiro Kida

The high-temperature wettability of AlN particle preforms with pure molten Cu, Al and Ph is quantified by means of drainage curves measured during pressure infiltration. By integrating the drainage curves obtained in this study, the work of immersion for e ...

2008

Direct measurement of drainage curves in infiltration of SiC particle preforms: influence of interfacial reactivity

Andreas Mortensen, Ludger Weber, Maryam Bahraini Hasani

We present dynamic measurement of drainage curves in two systems having relevance to metal matrix composite processing, namely SiC/Al and SiC/Al-12.2at%Si. Data show that liquid/solid chemical reactions that cause a lowering of the contact angle do indeed ...

Springer US2008

Thermal conductivity of Al-SiC composites with monomodal and bimodal particle size distribution

Andreas Mortensen, Ludger Weber

The thermal conductivity of aluminum matrix composites having a high volume fraction of SiC particles is investigated by comparing data for composites fabricated by infiltrating liquid aluminum into preforms made either from a single particle size, or by m ...

2008

Direct measurement of drainage curves in infiltration of SiC particle preforms

Andreas Mortensen, Ludger Weber, Maryam Bahraini Hasani

Drainage curves (plots of the non-wetting fluid saturation versus applied pressure) for infiltration of SiC particle preforms with Al and Al-12.2 at.% Si are measured at 1023 K (750 degrees C) with a pressure infiltration apparatus adapted for direct track ...

2008

Thermal conductivity of aluminum matrix composites reinforced with mixtures of diamond and SiC particles

Ludger Weber, Martin Rhême

Aluminum matrix composites reinforced with mixtures of diamond and SiC particles of equal size were produced by gas pressure assisted liquid metal infiltration. Replacing SiC gradually by diamond particles results in a steady increase of thermal conductivi ...

2008

Tensile flow stress of ceramic particle-reinforced metal in the presence of particle cracking

Randoald Müller, Andreas Mortensen, Ludger Weber, Andreas Rossoll

A simplified model is proposed to quantity the effect of damage in the form of particle cracking on the elastic and plastic behaviour of particle-reinforced metal matrix composites under uniaxial tensile loading: cracked particles are simply replaced, in a ...

2008

Infiltration of graphite preforms with Al-Si eutectic alloy and mercury

Andreas Mortensen, Ludger Weber, Maryam Bahraini Hasani

2007

On the influence of active element content on the thermal conductivity and thermal expansion of Cu-X (X = Cr, B) diamond composites

Ludger Weber, Reza Tavangar Hamzehkolaei

2007

Assessing predictive schemes for thermal conductivity against diamond-reinforced silver matrix composites at intermediate phase contrast

Ludger Weber, Reza Tavangar Hamzehkolaei

2007

The electrical conductivity of microcellular metals

Andreas Mortensen, Ludger Weber

The electrical conductivity of metallic foams varies strongly with porosity. Data are presented for replicated open-pore microcellular metal over a wide range of relative density. These data, together with data from the literature for different foam struct ...

2006

Reactivity and thermal behaviour ofCu-Si/SiC composites: effects of SiC oxidation

Andreas Mortensen, Ludger Weber

2006

Damage accumulation during cyclic loading of a continuous alumina fibre reinforced aluminium composite

Andreas Mortensen, Ludger Weber, Benedikt Moser

Fibres fracture gradually during the fatigue cycling of continuous alumina fibre reinforced aluminium. The number of fibre breaks increases linearly with the logarithmic cycle number, depends on the maximum stress and the stress ratio, and agrees with publ ...

2005

Dissipateur thermique constitue d'un materiau composite diamant-cuivre renfermant du bore

Ludger Weber

A heat sink that is particularly suitable for semiconductor components is made from a diamond-containing composite material. In addition to a diamond fraction amounting to 40-90% by volume, the composite material also contains 7 to 59% by volume copper or ...

2005

Non-conducting inclusions in a conducting matrix: Influence of inclusion size on electrical conductivity

Ludger Weber

2005

Measuring and tailoring capillary forces during liquid metal infiltration

Andreas Mortensen, Ludger Weber, Maryam Bahraini Hasani, Masahiro Kida

A new technique is proposed for the direct measurement of capillary forces in systems of relevance to the infiltration processing of metal matrix composites. Capable of handling melt temperatures up to 1500 K and infiltration pressures up to 20 MPa, the te ...

2005

Wetting in infiltration of alumina particle preforms with molten copper

Andreas Mortensen, Ludger Weber, Maryam Bahraini Hasani

The high-temperature wettability of alumina particulate preforms by copper is investigated by means of infiltration experiments conducted at 1473 K under low oxygen partial pressure. Wetting is quantified in terms of drainage curves, which plot the volume ...

Kluwer Academic Publishers, Springer2005

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