jobbank.dk: Development of high-temperature superconducting wires (AFM-2)

<div id="noframeDescription"> We propose a variety of projects relating to the manufacture of superconducting wires in view of power applications. The projects are mostly experimental in nature and are performed within a tight collaboration between Risø DTU and DTU Physics. Purpose World’s rapidly increasing energy demand, dwindling fossil fuel resources and concerns about climate change require significant development and use of sustainable energy sources, decrease of power losses in network systems and reduction of pollution through CO2 release. High-temperature superconducting cables have a huge potential for contributing to all these areas owing to their capability of transporting electrical current with negligible losses and of creating large magnetic fields needed for coils expected to be in use in future fusion reactors as well as new-generation wind-mill generators. Superconducting cables are also used for low-loss current transfer over large distances, transformers, fault-current limiters, etc. Second generation high-temperature superconducting (HTS) wires used for cable manufacture are based on the YBa2Cu3O7 compound, having a critical temperature (Tc) of 90K and remarkable magnetic flux pinning capability. Such wires consist of a multilayer structure based on a bi-axially textured metal substrate covered by a buffer layer preventing reaction between the metal substrate and the HTS layer, which is laid on top of the buffer layer. During processing, care must be taken to transmit the biaxial texture of the metal substrate to the HTS material through the buffer layer. Schematic cross-section of a second generation HTS wire State-of-the-art manufacturing techniques involve either vacuum deposition techniques (resulting in limited wire length and very slow production rate), or chemical solution processing using trifluoroacetate precursors, which are expensive and result in HF vapour evolution. The present projects are part of a research program aiming at optimising the structure of the wires, improving their performance under actual working conditions and replacing the trifluoroacetate precursors by cheaper and safer materials. The long term goal is to build a superconducting wind-mill generator. Description The involved research covers many aspects. Depending on the type of project, candidate’s specific interests and background, personalised projects can be defined. A few examples of possible topics: Metal support: -Development of non-magnetic alloys. -Anisotropic recrystallisation structures (elongated grains). -Substrate reinforcement (alloying, dispersion hardening). Buffer layers: -Search for new compatible buffer materials. -Development of water-based routes for buffer deposition. -Studies of texture transmission mechanism. -Creation of nanometer-sized surface defects. Superconducting layer: -Development of water-based routes for deposition. -Effect of atomic substitutions on film performances. -Controlled introduction of non-superconducting defects. In all cases, emphasis will be on a thorough understanding of the processes at play. The students will have the opportunity of developing skills on various experimental techniques (X-ray diffraction, electron microscopy, thermal analysis, spectroscopy, low-temperature physical characterisation, etc…) that will be useful for their future carrier development. Qualifications Chemistry, physics, materials science, metallurgy Project form Thesis Final year project Term project Bachelor project Subjects Physics Chemistry Materials Engineering Duration 3 – 12 months depending on project form.</div> <div id="noframeInfo" title="Info"> Interesseret? Angiv venligst i din ansøgning, at du har set opslaget i Akademikernes Jobbank. Bedøm os: Er vi en arbejdsplads for dig? Fortæl os hvorfor? (valgtfrit og anonymt) kontakt til personer hos os indholdet på denne side erfaring med job, projekt o.lign. generel kendskab til os andet din uddannelsesbaggrund? 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Opret en agent og få tilsendt sidste nyt fra virksomheden.  ',CENTER,BELOW,OFFSETY,20,WIDTH,200,FGCLASS,'overlibFG',BGCLASS,'overlibBG');" onmouseout="return nd();" onsubmit="$('#messageContent').html('Opretter tilmelding...'); $('#messageBox').animate({ top: '-700px' },'fast',function() { $('#messageBox').animate({ top: '90px' },'fast') }); $.get('/ajax.asp?act=virksomhed/follow/14803/219655/job&mail='+$('#followMail390600085').val(),function(data) { $('#messageContent').html(data); }); return false;"> Følg os: Få vores job og nyheder! Virksomhed Risø DTU Aktiveret 10. januar 2012 Opslagstype Studieprojekt Geografi StorkøbenhavnRoskilde området Uddannelse Elektro & TelekommunikationKemi, Biotek & MaterialerMaskin & DesignMatematik, Fysik & NanoNaturvidenskabTeknik & Teknologi Arbejdsområde Kunst & KulturForskning & UdviklingNaturvidenskabProduktionRådgivning & SupportTeknik</div>