Magnesium Diboride (MgB₂) bulk superconductor has been manufactured for use in
superconducting fault current limiters (SFCLs) via in situ reaction. SFCLs have proven to be a
viable means for limiting surge currents on power lines by dissipating fault energy as the
superconductor quenches. As the current limiting behaviour is determined by the normal resistance
(Rn), research has been conducted to evaluate an effective means to increase Rn for bulk
superconducting MgB₂. Other researchers have previously looked into the improvement and
optimisation of the critical current, Jc, by carbon doping and other flux pinning techniques. Carbon
doping has been confirmed as a means to increase Rn, and was implemented by chemical vapour
deposition (CVD) at 600 ºC in a tubular furnace apparatus. Intragranular doping was achieved by
CVD on the boron precursor powder. In situ manufacturing of MgB₂ bulk was performed using the
reactive liquid magnesium infiltration technique. Carbon doping provided an adequate increase in
Rn, for a small decrease in the critical temperature, Tc. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2012.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ukzn/oai:http://researchspace.ukzn.ac.za:10413/8954 |
| Date | January 2012 |
| Creators | Archer, Jonathan Celvin. |
| Contributors | Jarvis, Alan Lawrence Leigh. |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
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