Processing and properties of hot-forged bulk superconductors

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(Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} (Bi-2223) and TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} (Tl-1223) bars were hot forged in air at 820--850C. Final stresses of 2--3 MPa were sufficient to produce >95% dense Bi-2223 bars. In contrast, stresses to {approx}42 MPa were able to produce only 75--80% dense Tl-1223 bars. The Bi-2223 bars were more phase-pure and exhibited much stronger c-axis textures than the Tl-1223. Maximum critical current densities at 77 K were 8 {times} 10{sup 4} A/cm{sup 2} for the Bi-2223 and 2 {times} 10{sup 4}/cm{sup 2} for the Tl-1223. Fracture strength and toughness values were 140 MPa and ... continued below

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6 p.

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Goretta, K.C.; Lanagan, M.T.; Picciolo, J.J.; Youngdahl, C.A.; Balachandran, U. & Chen, Nan December 31, 1995.

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(Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} (Bi-2223) and TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} (Tl-1223) bars were hot forged in air at 820--850C. Final stresses of 2--3 MPa were sufficient to produce >95% dense Bi-2223 bars. In contrast, stresses to {approx}42 MPa were able to produce only 75--80% dense Tl-1223 bars. The Bi-2223 bars were more phase-pure and exhibited much stronger c-axis textures than the Tl-1223. Maximum critical current densities at 77 K were 8 {times} 10{sup 4} A/cm{sup 2} for the Bi-2223 and 2 {times} 10{sup 4}/cm{sup 2} for the Tl-1223. Fracture strength and toughness values were 140 MPa and 2.9 MPa{radical}m for the Bi-2223 and 50 MPa and 0.5 MPa{radical}m for the Tl-1223.

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6 p.

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OSTI as DE96005002

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  • 7. US/Japan workshop on high temperature superconductors, Tsukuba (Japan), 22-24 Oct 1995

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  • Other: DE96005002
  • Report No.: ANL/ET/CP--88174
  • Report No.: CONF-9510250--2
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 198692
  • Archival Resource Key: ark:/67531/metadc669064

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 16, 2015, 5:36 p.m.

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Goretta, K.C.; Lanagan, M.T.; Picciolo, J.J.; Youngdahl, C.A.; Balachandran, U. & Chen, Nan. Processing and properties of hot-forged bulk superconductors, article, December 31, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc669064/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.