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Incorporation of superconducting MgB2 into plasma electrolytic oxidation coatings on aluminium

Research output: Contribution to journalJournal articlepeer-review

Article number125091
<mark>Journal publication date</mark>25/12/2019
<mark>Journal</mark>Surface and Coatings Technology
Number of pages7
Publication StatusPublished
Early online date24/10/19
<mark>Original language</mark>English


MgB 2 particles have been incorporated into a coating formed by AC plasma electrolytic oxidation (PEO) on aluminium under a constant current density. The incorporation of MgB 2 into the coating was characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The additions of particles to the electrolyte promoted a voltage decrease, possibly a result of the initiation of a “soft” sparking regime. The transition occurred at earlier times with increase of the MgB 2 concentration and enhanced MgB 2 incorporation into the coating. The coating containing particles was thicker than one in which MgB 2 was absent and had a nodular surface, with MgB 2 accumulations in the valleys between the nodules. A superconducting quantum interference device revealed superconductivity below about 39 K, the critical temperature of MgB 2, and hysteresis in magnetic moment-field curves that typifies a type II superconductor.