Stress analysis of ceramic insulation coating on Cu/MgB 2 wires for W&R MgB 2 coils

• Published in: Journal of alloys and compounds Vol. 470; no. 1; pp. 404 - 407
• Main Authors: Arda, L., Ataoglu, S., Abdulaliyev, Z., Sacli, O.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2009
• Subjects: Elasticity; Sol–gel processes; Superconductors; Thermal analysis; Superconductors; Elasticity; Sol–gel processes; Thermal analysis
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.02.080

Ceramic insulation coatings were produced on Cu/MgB 2 wires, which were fabricated by Hyper Tech Research Inc., using Continuous Tube Forming and Filling (CTFF) process, from the solution of Zr, and Y based organometalic compounds, solvent and chelating agent using reel-to-reel sol–gel technique for MgB 2 coils. Y 2O 3–ZrO 2/Cu/MgB 2 wires were annealed at 700 °C for 30 min with 5.8 °C/min heating rate under 4% H 2–Ar gas flow. Residual stresses were examined for Cu/MgB 2 wire and YSZ coatings with varying thicknesses. It was observed that displacement values are independent from YSZ thicknesses and the maximum effective stress value is in the Cu region. The surface morphologies and microstructure of samples were characterized using SEM. SEM micrographs of the insulation coatings revealed cracks, pinholes and mosaic structure.