Manufacturing of YBa{sub 2}Cu{sub 3}O{sub 7} coatings by low pressure and atmospheric plasma spraying for magnetic shielding applications
- Inst. for Materials in Energy Systems, Julich (Germany)
- Univ. of Twente, Enschede (Netherlands)
- Univ. Autonoma de Barcelona (Spain)
Plasma sprayed YBa{sub 2}Cu{sub 3}O{sub 7} (123)-coatings have been prepared with commercially available spraying powder on suitable substrates and buffer layers in flat and cylindrical geometries. Atmospheric (APS) and Low Pressure Plasma Sprayed (LPPS) 123-coatings were compared after the same post annealing conditions. The spraying atmosphere and the plasma power are the most important spraying parameters for the LPPS coatings. The post heat treatment of the sprayed coating has to be carefully adapted to substrate/buffer layer materials. Melt texturing of 123 coatings on CaSZ-tubes results in large cracks of the superconducting coating perpendicular to substrate due to the thermal mismatch. Annealing on stainless steel substrate with MeCrAlY buffer layers gives good structural and superconducting properties. The annealing temperature has to be lower than the peritectic temperature of the reaction YBa{sub 2}Cu{sub 3}O{sub 7} + CuO {yields} liquid + Y{sub 2}BaCuO{sub 5}. If the temperature is higher a strong reaction between the Cr-component of the substrate and the superconductor occurs. Magnetic shielding measurements with the cylindrical samples indicate sufficient superconducting properties of the APS coatings for low field magnetic shielding applications at 77 K.
- OSTI ID:
- 160451
- Report Number(s):
- CONF-940684--; ISBN 0-87170-509-5
- Country of Publication:
- United States
- Language:
- English
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