with high-temperature superconducting tapes, MgB2 wires have the
advantage of being at least one order of magnitude cheaper and therefore very
interesting for several power applications in spite of their relatively low
operation temperature. For applications involving alternative current, energy
losses appear and need to be minimized. This can be achieved by dividing the
ceramic MgB2 central core of the wire into finer filaments.
State-of-the-art processing of MgB2 for high magnetic field applications
require doping with carbon-containing additives, which often release gas
species during heat treatment. It is not clear, how far the relative location
of the filaments in a multifilament wire has an influence on the kinetics of
gas release and superconducting performance of the individual filaments, while
this could have a significant importance for the current transport capacity of
the wire as a whole.
The goal of
this project is to produce a multifilament MgB2 wire using the
in-situ technique, investigate the influence of filament locations on their
microstructure, phase purity and superconducting properties. The main outcome
is expected to be a set of guidelines on, how to improve the critical current
density of multifilament MgB2 wires.
During this project you are going to:
multifilament MgB2 superconducting wire using the in-situ reaction
microstructural characterization of your samples by means of X-ray diffraction,
optical and electron microscopy as well as energy dispersive spectroscopy.
magnetization measurements at cryogenic temperatures to evaluate the superconducting
performance of your samples. Characterisation of the individual filaments may
also be done by magneto-optical observations in collaboration with the
university of Oslo.
experimental results using state of the art theoretical models.
At the end of
this project you will be able to:
MgB2 superconducting wires (preparation of precursor powders,
mechanical deformation and heat treatments).
experimental characterization tools (X-ray diffraction, electron microscopy,
magnetization measurements, etc.) and explain their basic principles as well as
evaluate your results.
between microstructure and performance.
efficient literature search and compare your own results to published data.
results to a scientific audience under conditions equivalent to an
draft of a scientific publication.
Contact: Jean-Claude Grivel (email@example.com) – DTU Energy, building 301 (from 11/2019)