Ex-situ fabrication and characterization of MgB2/Cu and MgB2/Cu

Date

3-2006

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Marvin U. Herrera

Abstract

For electrical power transmission applications. MgB2/Cu and MgB2/Cu/Fe(SS) were prepared following the inexpensive and relatively straightforward ex-situ preparation route. In order to utilize the mechanically brittle MgB2, as conducting wires, reinforcement was implemented by the advanced metal-cladding technique, followed by swaging to impose mechanical deformation which is known to improve critical current density of the wire composite. and a heat treatment at 6400C for 5 hours to reduce the reaction kinetics between MO; and the metal sheath. For the first round wire composite, copper (Cu) tube was used resulting to an Mg132/Cu composite with a final wire composition of 40% MgB2, 60% Cu. The microstructure of the round wire resealed the presence of oxides in the MgB2 core. Also, smooth flaking and partial oxidation happened in the Copper metal clad. Stress releases in the appearance of deformations were observed on all sample of this wire composite. Tolerable stresses of about 200 MPa and yield strength of 50 MPa were observed.

For the second round wire composite, co-axial copper (Cu)/stainless steel (Fe[SS]) tube was used resulting to an MgB2/Cu/Fe(SS) composite with a final wire composition of 30% MgB2, 50% Cu and 20% Fe(SS). The microstructure of the round wire revealed the presence of oxides in the MgB2 core. Moreover, the topography of the Fe (Stainless Steel) is rough and flaky and partial oxidation happened in the Fe(SS) metal clad. Similar microstructures are found in the copper metal clad. Stress releases in the appearance of deforrmations were observed on all sample of this wire composite. Tolerable stresses of about 420 MPa and yield strength of 200 were observed. This work was successful in producing composite wires with properties probed for electrical power transmission applications. More variations in the dimensions and composition of the wires should be tried out, and more characterization techniques such as the transport current measurements should be carried out to quantify the effect of the mechanical deformation and the critical current of the composites. Moreover, systems to accommodate such new technology must be devised.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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