Preparation and thermal stress analysis of AI2o3 insulation coatings on ss-304 tape

Ataoğlu Ş., Arda L., Kadioglu N., Cakiroglu O., Bulut O., GÜLLÜOĞLU A. N., ...More

IEEE Transactions on Applied Superconductivity, vol.19, no.3, pp.2375-2378, 2009 (SCI-Expanded) identifier

  • Publication Type: Article / Abstract
  • Volume: 19 Issue: 3
  • Publication Date: 2009
  • Doi Number: 10.1109/tasc.2009.2018447
  • Journal Name: IEEE Transactions on Applied Superconductivity
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2375-2378
  • Keywords: Al2 O3, Electrical insulation and superconducting magnet, Sol-gel, Thermal stress
  • Hakkari University Affiliated: No

Abstract

A12O3 insulation coatings are grown on long-length stainless steel (SS) tapes using reel-to-reel sol-gel method for applications of HTS/LTS coils and magnets. Various ceramic solutions are prepared from Al based precursors, solvent and chelating agent, the coating are fabricated on SS substrates.Al2O3solution was successfully obtained using Al-sec-butoxide precursor, and iso- propanol and acetylacetone as solvent and chelating agents, respectively. In order to improve adhesion of Al2 O3 on the SS-304 tapes, triethanolamine was used in the solution. The residual stresses are investigated at different temperature ranges, between (630, 600, 580, and 550° C) and room temperature for different thicknesses (12, 10 and 7 μm). The maximum stress values are obtained as 0.756 GPa as tension on substrate (SS) for the 12 μm coating and 1.0 GPa as compression for the 7 μm A12O3 coating at 630° C. The surface morphology and microstructure of samples are characterized by a scanning electron microscope (SEM). SEM observation revealed that coatings have crack and mosaic structure. © 2009 IEEE.