Title :
Study on the High Temperature Pressure Charging Procedure of Bi-2223/Ag Superconducting Tapes
Author :
Qu, T.M. ; Gu, C. ; Huang, K.-T. ; Song, X.-H. ; Zeng, P. ; Han, Z.
Author_Institution :
Dept. of Mech. Eng., Tsinghua Univ., Beijing, China
fDate :
6/1/2011 12:00:00 AM
Abstract :
Hermetically sealed samples are required for HIP experiments of Bi-2223/Ag tapes. Otherwise the high pressure gas might penetrate into the inner sample and balance the outside pressure. In this work, a new high temperature pressure charging (HTPC) procedure was proposed for the HIP process of Bi-2223/Ag tapes. Some liquid phase was firstly formed during the normal pressure heat treatment and the gas pressure was then applied directly at high temperature. Dense filaments could be achieved after this new HIP process. It was found the gas inflation temperature (Tadd) and dwelling time before inflation (tadd) have some influence on the final microstructure morphology and critical current of HIP samples. A preliminary improvement of Ic of 13% was achieved after optimization, compared with that of normal pressure heat treated samples.
Keywords :
bismuth compounds; critical currents; high-temperature superconductors; silver; superconducting tapes; Bi-2223-Ag superconducting tapes; Bi2Sr2Ca2Cu3O10+x-Ag; HIP experiments; critical current; dense filaments; dwelling time; gas inflation temperature; high temperature pressure charging procedure; liquid phase; microstructure morphology; normal pressure heat treated samples; normal pressure heat treatment; Cogeneration; Critical current; Heat treatment; High temperature superconductors; Hip; Superconducting films; Bi-2223; crack-healing process; critical current; hot isostatic pressure;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2091484