High-temperature superconductor

Patent metadata

Field	Value
Publication number	US-2025031583-A1
Application number	US-202318522794-A
Country	US
Kind code	A1
Filing date	Nov 29, 2023
Priority date	Jul 21, 2023
Publication date	Jan 23, 2025
Grant date	—

Abstract

Provided is a ReBCO-based high-temperature superconductor composition and a method of preparing the same comprising substituting a part of Gd with Ho, wherein the ReBCO-based high-temperature superconductor is represented by ReBa 2 Cu 3 O 7-δ , in which Re comprises or consists of Gd and Ho. The superconductor may improve the critical current density without a change in the critical temperature.

First claim

What is claimed is:

1 . A rare-earth barium copper oxide (ReBCO)-based high-temperature superconductor composition represented by ReBa 2 Cu 3 O 7-δ , wherein Re is Gd and Ho.

2 . The high-temperature superconductor composition of claim 1 , represented by Ho x Gd 1-x Ba 2 Cu 3 O 7-δ , wherein x satisfies 0<x<1 and δ satisfies δ<7.

3 . The high-temperature superconductor composition of claim 2 , wherein x satisfies 0.4≤x≤0.6.

4 . A (Gd,Ho)BCO-based high-temperature superconductor composition, wherein a part of Gd is substituted with Ho.

5 . The high-temperature superconductor composition of claim 4 , wherein about 40-60% of a mole percentage of Gd before substitution is substituted with Ho.

6 . A method for preparing a (Gd,Ho)BCO-based superconductor composition, the method comprising:
preparing separately a Gd oxide powder, a Ba oxide powder, a Cu oxide powder, and a Ho oxide powder; a mixing step comprising mixing the prepared Gd oxide powder, Ba oxide powder, and Cu oxide powder according to a stoichiometry to prepare a mixed powder wherein a part of the Gd oxide powder is substituted with the Ho oxide powder; a molding step comprising molding the prepared mixture powder into a molded body; a first heating step comprising adjusting an amount of carbon (C) in the molded body; a second heating step comprising synthesizing the molded body into a (Gd,Ho)BCO-based molded body; a third heating step comprising growing crystal grains of the molded body; and an oxygen heating step comprising adjusting an amount of oxygen (O) in the molded body.

7 . The method of claim 6 , wherein in the mixing step, 40-60% of a mole percentage of Gd of the Gd oxide powder is substituted with Ho of the Ho oxide powder.

8 . The method of claim 6 , wherein in the molding step, the mixture powder is press-molded.

9 . The method of claim 8 , wherein in the molding step, the mixture powder is press-molded at about 5-20 MPa.

10 . The method of claim 6 , wherein the first heating step comprises:
heating the molded body at a heating rate between about 10° C./min and about 1° C./min; maintaining the molded body at about 880° C. for at least about 20 hours; and cooling the molded body at a cooling rate between about 10° C./min and about 1° C./min.

11 . The method of claim 6 , wherein the second heating step comprises:
heating the molded body at a heating rate between about 10° C./min and about 1° C./min; maintaining the molded body at about 900° C. for at least about 20 hours; and cooling the molded body at a cooling rate between about 10° C./min and about 1° C./min.

12 . The method of claim 6 , wherein the third heating step comprises:
heating the molded body at a heating rate between about 10° C./min and about 1° C./min; maintaining the molded body at about 925° C. for at least about 15 hours; and cooling the molded body at a cooling rate between about 10° C./min and about 1° C./min.

13 . The method of claim 6 , wherein in the oxygen heating step, the molded body is heat-treated at about 500° C. for at least about 12 hours in an oxygen atmosphere.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Seoul Nat Univ R&Db Foundation

Inventors

• Lee Hoo Dam
• Lee Tae Gyu
• Choi Kyung Sik
• Jang Hyung Kwan
• Min Byung Ho
• Choi Jun Hyeok
• Sur Yeahan
• Kim Sukho
• Kim Kee Hoon
• Lee Jungwoo

Classifications

• H01B12/00 Primary

  Superconductive or hyperconductive conductors, cables, or transmission lines · CPC title

• H10N60/0661

  Processes performed after copper oxide formation, e.g. patterning · CPC title

• H10N60/0296

  Processes for depositing or forming copper oxide superconductor layers · CPC title

• H10N60/857 Primary

  comprising copper oxide · CPC title

• Y02E40/60

  Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment · CPC title