A process has been developed for the synthesis of YBa2Cu307−x superconducting fibers from an organic acid precursor solution. Through rheology measurements on a series of precursor solutions, the molecular structure was determined and subsequently controlled to allow for fiber drawing. For solutions with a viscosity ⩾10 poise, fibers of 1 to 2 m length and 50 ~ 100 μm diameter can be hand drawn at ≈80 °C. Processing methods were developed to circumvent deformation of the thermoplastic fibers during heating and to minimize BaCO3 formation during decomposition. Fibers sintered at 850 °C for 1 h in 10−2 atm O2, followed by annealing at 500 °C for 4 h in O2, were fully dense, consisted of submicron grains, and were superconducting.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering