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Title: Melt-produced high temperature rare earth barium copper oxide superconductor and processes for making same

Abstract

This patent describes a method for making a melt-produced high temperature superconductor. It comprises the steps of: mixing and grinding BaCO/sub 3/ and CuO with nominal compositions of at least one compound chosen from the group consisting of Ba/sub 2/Cu/sub 3/O/sub 5/, BaCu/sub 3/O/sub 4/, BaCu/sub 4/O/sub 5/, BaCu/sub 6/O/sub 7/, and BaCu/sub 12/O/sub 13/; pressing the resultant mixture into a pellet; placing the pellet on a powder; heating the pellet and the powder in a furnace to form a melt at a pellet: powder interface; and removing the melt-produced superconductor from the powder in which the superconductor is embedded. Also described is a process for making melt-produced superconductor components of arbitrary shape. It comprises the steps of: mixing and grinding BaCO/sub 3/ and CuO in a nominal composition of BaCu/sub 3/O/sub 4/; heating the mixture, cooling the mixture, and grinding it; mixing and grinding Y/sub 2/O/sub 3/, BaCO/sub 3/, and CuO in a nominal composition of Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ powder; heating the mixture, then cooling it and grinding it; pressing the BaCu/sub 3/O/sub 4/ powder into an arbitrary shape and placing it onto the Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ powder; heating the BaCu/sub 3/O/sub 4/ and Y/sub 1.2/Ba/sub 0.8/CuO/submore » 3.6/ in flowing O/sub 2/ to form a melt at the pellet-powder interface; holding the furnace at 650{sup 0}C for about 4 hours; cooling the furnace to less than 200{sup 0}C and removing from the furnace the heated materials to bring them to room temperature; and separating a black melt-produced superconductor from the remaining Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ powder.« less

Inventors:
;
Publication Date:
OSTI Identifier:
5307092
Patent Number(s):
US 4857504
Application Number:
PPN: US 7089067A
Assignee:
Univ. of Arkansas, Fayetteville, AR NOV; NOV-89-081182; EDB-90-002562
Resource Type:
Patent
Resource Relation:
Patent File Date: 25 Aug 1987
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; SYNTHESIS; COPPER OXIDES; SUPERCONDUCTORS; MELTING; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; TRANSITION ELEMENT COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Hermann, A.M., and Sheng, Z.. Melt-produced high temperature rare earth barium copper oxide superconductor and processes for making same. United States: N. p., 1989. Web.
Hermann, A.M., & Sheng, Z.. Melt-produced high temperature rare earth barium copper oxide superconductor and processes for making same. United States.
Hermann, A.M., and Sheng, Z.. Tue . "Melt-produced high temperature rare earth barium copper oxide superconductor and processes for making same". United States.
@article{osti_5307092,
title = {Melt-produced high temperature rare earth barium copper oxide superconductor and processes for making same},
author = {Hermann, A.M. and Sheng, Z.},
abstractNote = {This patent describes a method for making a melt-produced high temperature superconductor. It comprises the steps of: mixing and grinding BaCO/sub 3/ and CuO with nominal compositions of at least one compound chosen from the group consisting of Ba/sub 2/Cu/sub 3/O/sub 5/, BaCu/sub 3/O/sub 4/, BaCu/sub 4/O/sub 5/, BaCu/sub 6/O/sub 7/, and BaCu/sub 12/O/sub 13/; pressing the resultant mixture into a pellet; placing the pellet on a powder; heating the pellet and the powder in a furnace to form a melt at a pellet: powder interface; and removing the melt-produced superconductor from the powder in which the superconductor is embedded. Also described is a process for making melt-produced superconductor components of arbitrary shape. It comprises the steps of: mixing and grinding BaCO/sub 3/ and CuO in a nominal composition of BaCu/sub 3/O/sub 4/; heating the mixture, cooling the mixture, and grinding it; mixing and grinding Y/sub 2/O/sub 3/, BaCO/sub 3/, and CuO in a nominal composition of Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ powder; heating the mixture, then cooling it and grinding it; pressing the BaCu/sub 3/O/sub 4/ powder into an arbitrary shape and placing it onto the Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ powder; heating the BaCu/sub 3/O/sub 4/ and Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ in flowing O/sub 2/ to form a melt at the pellet-powder interface; holding the furnace at 650{sup 0}C for about 4 hours; cooling the furnace to less than 200{sup 0}C and removing from the furnace the heated materials to bring them to room temperature; and separating a black melt-produced superconductor from the remaining Y/sub 1.2/Ba/sub 0.8/CuO/sub 3.6/ powder.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 1989},
month = {Tue Aug 15 00:00:00 EDT 1989}
}