Hot Isostatic Pressing (HIP) Densification Of Oxide Superconductors

J. K. Tien; B. C. Hendrix; J. C. Borofka; T. Abe

doi:10.1117/12.943994

18 May 1988 Hot Isostatic Pressing (HIP) Densification Of Oxide Superconductors

J. K. Tien, B. C. Hendrix, J. C. Borofka, T. Abe

Proceedings Volume 0879, Sensing, Discrimination, and Signal Processing and Superconducting Materials and Intrumentation; (1988) https://doi.org/10.1117/12.943994
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

Currently, consolidation of oxide superconductor powders is done by sintering, which is not effective in the reduction of porosity. This work demonstrates the feasibility of hot isostatic pressing (HIP) to obtain fully dense bulk superconductor. Modeling of the HIP process was used to .predict HIP conditions for production of fully dense superconducting material. It is predicted that fully dense YBa₂Cu₃0₇ can be obtained in reasonable times at temperatures down to around 650°C. The trade-offs between temperature, time, and pressure during HIP densification are analyzed as well as the effects of powder particle size and entrapped gas pressure. The HIP modeling has been verified experimentally under three conditions: 100 MPa HIP at 900°C for 2 hours (99.3% dense-full density), 100 MPa HIP at 750°C for 2 hours (96% dense), and sintering at 950°C for 16 hours (65% dense). A superconducting Meissner signal has been obtained on the fully dense specimen after a post-HIP heat treatment.

Citation Download Citation

J. K. Tien, B. C. Hendrix, J. C. Borofka, and T. Abe "Hot Isostatic Pressing (HIP) Densification Of Oxide Superconductors", Proc. SPIE 0879, Sensing, Discrimination, and Signal Processing and Superconducting Materials and Intrumentation, (18 May 1988); https://doi.org/10.1117/12.943994

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