Preparation method of single domain yttrium barium copper oxide superconductor

A yttrium barium copper oxide, superconducting block technology, applied in the field of high temperature cuprate superconducting materials, can solve the problems of weak connection, weak magnetic flux pinning ability, etc., achieve simplified process, improve magnetic flux pinning ability, The effect of reducing the cost of experiments

Active Publication Date: 2012-07-04
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inherent crystal defects in the superconducting bulk material prepared by the infiltration growth process, such as weak connection between grain boundaries, weak magnetic flux pinning ability, etc., these all restrict the performance of superconducting bulk material. Further improvement; In addition, due to the top seed crystal infiltration process in the superconducting bulk material Y 2 BaCuO 5 The particle size of the particle has reached 1 μm, that is, its minimum particle size. Therefore, it is necessary to further increase the critical current density J c It is necessary to introduce effective flux pinning centers in the YBCO superconducting bulk

Method used

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  • Preparation method of single domain yttrium barium copper oxide superconductor
  • Preparation method of single domain yttrium barium copper oxide superconductor
  • Preparation method of single domain yttrium barium copper oxide superconductor

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Based on the doping raw material Bi 2 o 3 powder as an example to prepare single-domain yttrium-barium-copper-oxide superconducting bulk material, the preparation method is as follows:

[0039] 1. Preparation of doped Bi 2 o 3 Pink Y 2 CuO 5 pioneer powder

[0040] Take 67.3803g Y 2 o 3 , 58.88387g BaCO 3 , 23.7359g CuO powder mixed evenly, Y 2 o 3 with BaCO 3 , The molar ratio of CuO powder is 1:1:1, and Y is prepared by solid state reaction method 2 BaCuO 5 pink. Take 100g Y 2 BaCuO 5 powder into the ball mill, add Y 2 BaCuO 5 Powder mass 0.7% Bi 2 o 3 powder, mixed evenly, prepared into Y 2 BaCuO 5 Herald powder.

[0041] 2. Preparation of liquid phase source powder

[0042] Take 106.9064g BaCO 3 , 43.0936g CuO mixed, BaCO 3 The molar ratio with CuO powder is 1:1, and BaCuO is prepared by solid state reaction method 2 pink. Take 22.6956g Y 2 o 3 , 79.3350g BaCO 3 , 47.9695g CuO powder mixed, Y 2 o 3 with BaCO 3 The molar ratio of CuO ...

Embodiment 2

[0060] Based on the doping raw material Bi 2 o 3 powder as an example to prepare single-domain yttrium-barium-copper-oxide superconducting bulk material, the preparation method is as follows:

[0061] In the preparation of doped Bi 2 o 3 Pink Y 2 BaCuO 5 In step 1 of the precursor powder, prepare Y 2 BaCuO 5 Powder used raw material and preparation method are identical with embodiment 1, get 100g Y 2 BaCuO 5 Add the powder to the ball mill and mix evenly, add Y 2 BaCuO 5 Powder mass 0.1% Bi 2 o 3 , mixed uniformly, and prepared as doped Bi 2 o 3 Pink Y 2 BaCuO 5 Pioneer powder; doped with Bi in press 2 o 3 Pink Y 2 BaCuO 5 In the step 3 of the pioneer block and the liquid phase block, take 9g doped Bi 2 o 3 Pink Y 2 BaCuO 5 Pioneer powder, 10.8g liquid phase source powder, doped with Bi 2 o 3 Pink Y 2 BaCuO 5 The mass ratio of the precursor powder to the liquid phase source powder is 1:1.2, and they are respectively pressed into doped Bi with the sam...

Embodiment 3

[0063] Based on the doping raw material Bi 2 o 3 powder as an example to prepare single-domain yttrium-barium-copper-oxide superconducting bulk material, the preparation method is as follows:

[0064] In the preparation of doped Bi 2 o 3 Pink Y 2 BaCuO 5 In step 1 of the precursor powder, prepare Y 2 BaCuO 5 Powder used raw material and preparation method are identical with embodiment 1, get 100gY 2 BaCuO 5 Add the powder to the ball mill and mix evenly, add Y 2 BaCuO 5 Powder mass 2% Bi 2 o 3 , mixed uniformly, and prepared as doped Bi 2 o 3 Pink Y 2 BaCuO 5 Pioneer powder; doped with Bi in press 2 o 3 Pink Y 2 BaCuO 5 In the step 3 of the pioneer block and the liquid phase block, take 9g doped Bi 2 o 3 Pink Y 2 BaCuO 5 Pioneer powder, 14.04g liquid source powder, doped with Bi 2 o 3 Pink Y 2 BaCuO 5 The mass ratio of the precursor powder to the liquid phase source powder is 1:1.56, and they are respectively pressed into Bi-doped particles with the ...

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Abstract

The invention relates to a preparation method of a single domain yttrium barium copper oxide superconductor; and the preparation method comprises the following steps: preparing Y2BaCuO5 precursor powder and liquid phase source powder, pressing a Y2BaCuO5 precursor block, a liquid phase block and a supporting bock, preparing a green body, growing a single domain yttrium barium copper oxide block in an infiltration manner, and carrying out oxygen permeation processing. A second phase nanoparticle Y2Ba4CuBiOx/Y2Ba4CuMOx (M is Bi or W) is successfully introduced for forming a flux pinning center by adopting a top seed crystal infiltration growing method and adding a metallic oxide (Bi2O3 powder and WO3 powder) for doping, thereby the powder preparation technology is simplified, the experimental period is shortened, the experiment cost is reduced, and the flux pinning capacity of the superconductor is increased. Y2O3 is used for preparing the supporting block which stably supports two briquettes above the supporting block in the slow cold growing process of an yttrium barium copper oxide block so as to prevent liquid phase from running off. The preparation method can be used for preparing the yttrium barium copper oxide superconductor and can also be used for preparing high-temperature superconductors of other series such as Gd, Sm, Nd, Eu and the like.

Description

technical field [0001] The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and in particular relates to the preparation of oxide-doped yttrium-barium-copper-oxygen superconducting bulk materials by a top seed crystal infiltration growth process. Background technique [0002] Monodomain copper oxide high temperature superconducting bulk material (RE-Ba-Cu-O, where RE is a rare earth element, such as Y, Gd, Nd, etc.) has a high critical temperature and critical current density, and has a strong magnetic field Strong flux pinning capability. This advantage has laid the foundation for the application of this type of material in magnetic levitation technology, especially in the development of superconducting magnetic levitation bearings, energy storage flywheels, and superconducting motors and generators. In the process of preparing single-domain copper oxide superconducting bulk materials, there are two main processes that ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B11/00
Inventor 杨万民王妙李国政
Owner SHAANXI NORMAL UNIV
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