Publications by Reza Tavangar Hamzehkolaei

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

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

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

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

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

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

Damage evolution in Saffil alumina short-fibre reinforced aluminium during tensile testing

Andreas Mortensen, Ludger Weber, Reza Tavangar Hamzehkolaei

The evolution of microstructural damage during tensile deformation of pure aluminium reinforced with 10 vol.% alumina short fibres is studied by monitoring the evolution of density and Young's modulus as a function of tensile strain. It is found that Young ...

2005

Ductility of Saffil(TM) short fibre reinforced metals

Andreas Mortensen, Ludger Weber, Reza Tavangar Hamzehkolaei

It is proposed that a critical combination of matrix strain hardening exponent and fibre volume fraction must be exceeded to confer attractive tensile ductility to short-fibre reinforced metal. © 2005 Acta Materialia Inc. Published by Elsevier Ltd. Al ...

2005