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Journal of Materials Science

, Volume 29, Issue 6, pp 1629–1635 | Cite as

Laser surface refinement of YBa2Cu3Ox superconductor

  • C. H. S. Shih
  • P. A. Molian
  • R. W. McCallum
  • U. Balachandran
Papers

Abstract

A novel laser-processing technique that produces bulk YBa2Cu3Ox (1 2 3) plates has been developed. Through the application of a square CO2 laser beam with uniform energy density distribution to the surface of 1 2 3 powder compact, a single piece of ribbon-like plate is produced. This plate may be separated from the powder compact after laser scanning. The width of the plate is ≈ 6 mm, while its thickness is 0.1–0.2 mm. Powder X-ray diffraction indicates that laser-treated samples contain both orthorhombic and tetragonal 1 2 3 phases, as well as Y2O3 (2 0 0), Y2BaCuO5 (2 1 1), BaCuO2 (0 1 1), and CuO (0 0 1) phases. Scanning electron microscopy reveals a pattern of phase segregation along the transverse cross-section after solidification of the plate. After oxygen annealing of a single ribbon piece, Tc is found to be 90 K. This technique may be applicable to the mass production of 1 2 3 bulk superconductor by continuous melting of 1 2 3 powders. In addition to its potential for practical applications, the laser technique also helps to explain the complex phases and microstructure formation during melting and solidification of laser-melted 1 2 3 liquid. A model relating the microstructure to the thermal history inside the laser-affected region and to the phase diagram of incongruently melting 1 2 3 material has been developed to analyse phase formation during laser melting and solidification processes. Reasonable correspondence between theoretical analysis and experimental results was obtained.

Keywords

Powder Compact Y2O3 Laser Surface Oxygen Annealing Phase Segregation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • C. H. S. Shih
    • 1
  • P. A. Molian
    • 1
  • R. W. McCallum
    • 1
    • 2
  • U. Balachandran
    • 3
  1. 1.Department of Mechanical EngineeringIowa State UniversityAmesUSA
  2. 2.Ames Laboratory, Department of Materials Science and EngineeringIowa State UniversityAmesUSA
  3. 3.Energy Technology DivisionArgonne National LaboratoryArgonneUSA

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