Thermal modeling of laser surface refinement of YBa{sub 2}Cu{sub 3}O{sub x} superconductor
Technical Report
·
OSTI ID:354000
- Iowa State Univ., Ames, IA (United States). Advanced Laser Processing Lab.
- Ames Lab., IA (United States)
- Argonne National Lab., IL (United States). Energy Technology Div.
A laser processing technique using a 6 x 6 mm square-configured CO{sub 2} laser beam was developed to produce thin plates of YBa{sub 2}Cu{sub 3}O{sub x} (123) compound. The process consisted of scanning a 1,000 W continuous-wave laser beam (power density: 3 kW/cm{sup 2}) over the surface of a 123 powder compact resulting in the formation of a single piece of ribbonlike plate that can be separated from the bulk. The width of the plate was {approx} 6 mm, while its thickness was 0.1--0.2 mm depending on the laser scan rate that ranged from {approx} 20 mm/sec to {approx} 85 mm/sec. Powder X-ray diffraction indicates that the laser-formed plates contained orthorhombic and tetragonal 123 phases, as well as Y{sub 2}O{sub 3} (200), Y{sub 2}BaCuO{sub 5} (211), BaCuO{sub 2} (011), and CuO (001) phases. After oxygen annealing, the samples exhibited a transition temperature of 90 K. Thermal models relating the microstructure to the thermal history inside the laser-affected region and to the phase diagram of incongruently melting 123 material were applied to understand the formation of microstructural phases. This technique may be applicable to mass production of 123 bulk superconductors by continuous laser melting and resolidification of 123 powders.
- Research Organization:
- Argonne National Lab., IL (United States); Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States); USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38; W-7405-ENG-82
- OSTI ID:
- 354000
- Report Number(s):
- ANL/ER/PP--86802; ON: DE97008051
- Country of Publication:
- United States
- Language:
- English
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