TY - JOUR
T1 - Densification of bii 8(pb)o35sri9ca2icu3 0a And texture development through sinter-forging
AU - Tampieri, Anna
AU - Masini, Roberto
AU - Dimesso, Lucangelo
AU - Guicciardi, Stefano
AU - Malpezzi, M. Cristina
PY - 1993/1/1
Y1 - 1993/1/1
N2 - A technique known as sinter-forging has been used to achieve dense Bi1.8(Pb)0.35Sr1.9Ca2.1Cu3Ox high-Tc superconducting material with oriented grains. The relationship between the final microstructure and processing conditions was elucidated. Material density and texture increases with the hot-forging pressure and temperature. Grains are elongated with the c-axis oriented approximately parallel to the direction of applied stress. The degree of grain orientation has been quantified using X-ray diffraction and is reported in terms of Lotgering's orientation factors. A maximum orientation factor of 38% was found for processing at 830°C and 4 MPa in air. The influence of the sintering temperature and atmosphere on the electrical properties has been investigated. After processing at 810°C and 4 MPa, the sinter-forged materials exhibit superconductivity, according to resistivity measurements, with a Tc (R=0) of 104 K. The critical current density at 77 K increases with increasing bulk density.
AB - A technique known as sinter-forging has been used to achieve dense Bi1.8(Pb)0.35Sr1.9Ca2.1Cu3Ox high-Tc superconducting material with oriented grains. The relationship between the final microstructure and processing conditions was elucidated. Material density and texture increases with the hot-forging pressure and temperature. Grains are elongated with the c-axis oriented approximately parallel to the direction of applied stress. The degree of grain orientation has been quantified using X-ray diffraction and is reported in terms of Lotgering's orientation factors. A maximum orientation factor of 38% was found for processing at 830°C and 4 MPa in air. The influence of the sintering temperature and atmosphere on the electrical properties has been investigated. After processing at 810°C and 4 MPa, the sinter-forged materials exhibit superconductivity, according to resistivity measurements, with a Tc (R=0) of 104 K. The critical current density at 77 K increases with increasing bulk density.
KW - Bi(Pb)SrCaCuO
KW - High-7c superconductor
KW - Hot-forging
KW - Superconductor densification
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U2 - 10.1143/JJAP.32.4490
DO - 10.1143/JJAP.32.4490
M3 - Article
AN - SCOPUS:0027684630
VL - 32
SP - 4490
EP - 4495
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
SN - 0021-4922
IS - 10 R
ER -