Annealing and mechanical properties of bulk Y-Ba-Cu-O

Author

Goretta, K.C. ; Diko, P. ; Ming Jiang ; Cuber, M.M. ; Ming Xu ; Ostenson, J.E. ; Sengupta, S.

Author_Institution

Argonne Nat. Lab., IL, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2081

Lastpage

2084

Abstract

Melt-processed YBa/sub 2/Cu/sub 3/O/sub x//Y/sub 2/BaCuO/sub 5/ and conventional polycrystalline sintered YBa/sub 2/Cu/sub 3/O/sub x/ pellets were prepared. Elastic modulus, hardness, and fracture strength were measured on selected sections cut from the pellets. Strength in the melt-processed pellets ranged from 32 to 94 MPa and was highest in the center. Variations in strength were related to microstructural features, especially Y/sub 2/BaCuO/sub 5/ distribution. To improve strength, we attempted to minimize microcracking by manipulating cooling rates and annealing times. We found that control of annealing reduced microcracking of the polycrystalline sintered pellets, but had little effect on the single-domain melt-processed pellets.

Keywords

annealing; barium compounds; elastic moduli; fracture toughness; hardness; high-temperature superconductors; microcracks; yttrium compounds; Y/sub 2/BaCuO/sub 5/ distribution; YBa/sub 2/Cu/sub 3/O-Y/sub 2/BaCuO/sub 5/; annealing time; cooling rates; elastic modulus; fracture strength; hardness; melt-processed pellets; microcracking; polycrystalline sintered pellets; Annealing; Cooling; Laboratories; Magnetic field measurement; Mechanical factors; Mechanical variables measurement; Microstructure; Superconductivity; US Department of Energy; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784876

Filename

784876