Technische Universität Wien
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Focus of research

MMCs for thermal management applications
Metal matrix composites based on matrices like Ag, Cu and Al together with highly conductive inclusions like diamonds, pitch based carbon fibres, SiC or graphite flakes are one of the main research topics within the group.
The work focus on the preparation by gas pressure assisted liquid metal (alloy) infiltration or by "chemical mixing" of the constituents and subsequent consolidation by solid/liquid state sintering, hot pressing or hot extrusion.

 Low temperature thermal properties of composites
Thermal and electrical conductivity of diamond and C-fibre composite materials are investigated in the temperature range of 4 K up to ambient temperature in a 4He cryostat using a steady state heat flow method (together with the group of Prof. Dr. E. Bauer, Institute of Solid State Physics at TU Vienna).

Fibre reinforced MMCs for experimental rocket engine nozzles
This is an ongoing joint project with the TU Space Team and aims for the preparation of carbon fibre reinforced MMcs to be used in experimental rocket engines as nozzle material.

 

Low melting solder materials

 

High entropy alloys

 

Bulk Nano-MMCs with Carbon Nanotubes
Special attention has been paid in recent years to the incorporation of C-Nanotubes within a metallic matrix like Ag or Cu for the preparation of nano-composites which exceptional thermal properties, which mainly addresses low CTE and high thermal conductivity. Research is still going on at this forefront of research.

„Interface-Engineering“ in composites
The interface between the constitutents in a composite material is of enormeous importance to master the stresses and the thermal interface conductance in order to gain full potential of high conductive phases and must be carefully addressed.

Functionally graded interlayers for divertor in ITER
Functional graded interlayers of W/Cu materials are under development to combine the heat sinks (CuCrZr) and the PFM plasma-facing materials like W or CFC in the divertor module of ITER.

ODS-materials
Oxide dispersion reinforced precious metals are in the focus of this research. Typical applications are thin Pt-sheet materials reinforced with Y2O3- or ZrO2-particles for the glass industry or ODS-Ag as contact material. Preparation methods comprise internal oxidation of alloys, classical PM methods, like high energy ball mixing and hot pressing/hot extrusion or so called "reaction milling", a method which has been driven by the work of Prof. Dr. G. Jangg for Al-materials (i.e. high energy attritor ball milling of Al and C to react to Al-Al4C3 materials).

PRM's
Ti/SiC particle reinforced composites and WC/Ag contact materials had been investigated.

Recovery of valuable metals/Recycling
Research focuses here on the recycling of metallic materials like hardmetals, heavy metals, precious metals, Mg-alloys and Mg-salts from secondary Mg production, as well as composites.
Hardmetals and heavy metals are recovered by selective leaching of the binder phase using acetic acid as solvent (wrk done together with SMET-group, Ao.Prof. Dr. W.-D. Schubert, Institute of Chemical Technologies and Analytics).
Precious metals recovery from Pt-alloys used in glass industry is done by pyrometallurgical refining (vacuum induction melting using the different vapour pressures in multicomponent systems), by solvent extraction or by precipitation methods e.g. using ammoniumchloride and the different solubilities of the different precious metal complexes.

Growth mechanisms of nanobelt, nanowires and nanoribbons on Si-wafers for gas sensor applications
The synthesis of different nanostructures on Si-wafers are studied. Investigated materials comprise Mo-, and W-oxides, as well as tin-, and zinc-oxides which can be grown by the evaporation of metallic targets or by the spray pyrolysis process (together with the group of Doz. T. Köck at MCL, Leoben, formerly at AIT).