Method of manufacturing a powder of bi-based superconductive oxi

Details Method of manufacturing a powder of bi-based superconductive oxi Method of manufacturing a powder of bi-based superconductive oxi

1989-08-07

1991-06-25

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

75232, 75234, 75235, 252521, 419 30, 419 31, 419 37, 423593, 423604, 501123, 505742, 505782, C01B 1332, C01F 1102, C01G 2900, C01G 302

Patent

active

050266802

ABSTRACT:
A Ca carbonate powder, a Sr carbonate powder, and a Cu oxide powder are mixed in predetermined proportions, and sintered at a first predetermined temperature into a Ca-Sr-Cu--O oxide sintered body. A Bi oxide powder and a Pb oxide powder are mixed in predetermined proportions, and are sintered at a second predetermined temperature into a Bi--Pb--O oxide sintered body. The obtained Ca--Sr--Cu--O oxide sintered body and Bi--Pb--O oxide sintered body are crushed, and the resulting Ca--Sr--Cu--O oxide powder and Bi--Pb--O oxide powder are mixed in predetermined proportions. The resulting mixed powder is sintered at a third predetermined temperature into a Bi--Pb--Sr--Ca--Cu--O superconductive oxide sintered body, which is crushed into a powder of a Bi-based superconductive oxide containing Pb. A sintered body of the Bi-based superconductive oxide containing Pb is formed from the Bi-based superconductive oxide powder. According to another method, a sintered body of a Bi-based superconductive oxide containing Pb may be manufactured such that a Bi oxide powder and a Pb oxide powder are mixed in predetermined proportions, and sintered at a predetermined temperature into a Bi--Pb-- O oxide sintered body. The Bi--Pb--O oxide sintered body is crushed into a powder, followed by mixing the powder with a Bi--Sr--Ca--Cu--O oxide powder in predetermined proportions into a mixed powder. The above Bi-based superconductive oxide sintered body is formed from the last-mentioned mixed powder.

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