Method for preparing single-domain yttrium barium copper oxide bulk superconductor by taking Y2BaCuO5 as base material

A technology of yttrium barium copper oxide and matrix materials, which is applied in the field of high-temperature copper oxide superconducting materials, can solve the problems of changing the initial ratio of the liquid phase source block, unfavorable growth and performance of the sample block, and waste of the liquid phase, etc., to improve Stability and repeatability, shortening the experimental cycle, avoiding the effect of tilting or collapsing

Inactive Publication Date: 2014-08-13
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In addition, the liquid phase support blocks used in the current TSIG method are all pressed by rare earth oxides, such as Y 2 o 3 or Yb 2 o 3 , which absorb BaCuO from the liquid-phase source compact during high-temperature heat treatment 2 component and transforms into Y 2 BaCuO 5 or Yb 2 BaCuO 5 On the one hand, this causes waste of the liquid phase, and on the other hand, it will also change the initial ratio of the liquid source block, which will adversely affect the growth and performance of the sample block

Method used

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  • Method for preparing single-domain yttrium barium copper oxide bulk superconductor by taking Y2BaCuO5 as base material
  • Method for preparing single-domain yttrium barium copper oxide bulk superconductor by taking Y2BaCuO5 as base material
  • Method for preparing single-domain yttrium barium copper oxide bulk superconductor by taking Y2BaCuO5 as base material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Prepare Y 2 BaCuO 5 Precursor powder:

[0028] Take 73.8453g Y 2 o 3 , 50.1414g BaO, 26.0133g CuO initial powder mixed evenly, namely Y 2 o 3 The molar ratio of BaO and CuO initial powder is 1:1:1, and Y is prepared by solid state reaction method 2 BaCuO 5 precursor powder;

[0029] (2) Preparation of liquid phase source powder:

[0030] Take 80.4435g BaO and 69.5565g CuO primary powder and mix evenly, that is, the molar ratio of BaO and CuO primary powder is 3:5, and the nominal composition is Ba 3 Cu 5 o 8 mixed powder; then take 100g Ba 3 Cu5 o 8 Mix powder with 15g Y 2 BaCuO 5 Mix the precursor powder evenly, that is Ba 3 Cu 5 o 8 Mix powder with Y 2 BaCuO 5 The mass ratio of the precursor powder is 1:0.15, which is used as the liquid phase source powder;

[0031] (3) Press the precursor block:

[0032] Take 12g Y 2 BaCuO 5 Put the precursor powder into a cylindrical mold 1 (20 mm in diameter) and press it into Y 2 BaCuO 5 Solid-phase bl...

Embodiment 2

[0042] In step (2) of preparing the liquid phase source powder, prepare Ba 3 Cu 5 o 8 The raw material that mixed powder is used and preparation method are identical with embodiment 1, get 100g Ba again 3 Cu 5 o 8 Mix powder with 10g Y 2 BaCuO 5 Mix the precursor powder evenly, that is Ba 3 Cu 5 o 8 Mix powder with Y 2 BaCuO 5 The mass ratio of the precursor powder is 1:0.1, which is used as the liquid phase source powder.

[0043] In step (3) of pressing the precursor block, take 6g of Y 2 BaCuO 5 The precursor powder is put into a cylindrical mold 1 (diameter 16 mm) and pressed into Y 2 BaCuO 5 Solid phase block; take 7.5g of liquid phase source powder and put it into a cylindrical mold 2 (20 mm in diameter) and press it into a liquid phase source block; that is, the Y 2 BaCuO 5 The mass ratio of the precursor powder to the liquid phase source powder is 1:1.25, and the diameter of the cylindrical mold 2 is 4 mm larger than that of the cylindrical mold 1; 2 B...

Embodiment 3

[0047] In step (2) of preparing the liquid phase source powder, prepare Ba 3 Cu 5 o 8 The raw material that mixed powder is used and preparation method are identical with embodiment 1, get 100g Ba again 3 Cu 5 o 8 Mix powder with 20g Y 2 BaCuO 5 Mix the precursor powder evenly, that is Ba 3 Cu 5 o 8 Mix powder with Y 2 BaCuO 5 The mass ratio of the precursor powder is 1:0.2, which is used as the liquid phase source powder.

[0048] In step (3) of pressing the precursor block, take 6g of Y 2 BaCuO 5 The precursor powder is put into a cylindrical mold 1 (diameter 16 mm) and pressed into Y 2 BaCuO 5 Solid phase block; take 10.5g of liquid phase source powder and put it into a cylindrical mold 2 (30 mm in diameter) and press it into a liquid phase source block; that is, the Y 2 BaCuO 5 The mass ratio of the precursor powder to the liquid phase source powder is 1:1.75, and the diameter of the cylindrical mold 2 is 14 mm larger than that of the cylindrical mold 1; th...

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Abstract

The invention discloses a method for preparing a single-domain yttrium barium copper oxide bulk superconductor by taking Y2BaCuO5 as a base material. The method comprises the steps of preparing Y2BaCuO5 precursor powder; preparing liquid-phase source powder; pressing a precursor block; assembling the precursor block; infiltrating and growing a single-domain yttrium barium copper oxide bulk; carrying out oxygen infiltration treatment. BaCuO2 precursor powder is replaced with initial powder of BaO and CuO, so that only the Y2BaCuO5 precursor powder is needed in the whole infiltrating and growing processes, experimental links are simplified, experimental periods are shortened, and the preparation efficiency is increased. A supporting block pressed by using the Y2BaCuO5 precursor powder can be used for stably supporting two blanks on the supporting block in the slowly-cooled growing process of the yttrium barium copper oxide bulk, avoiding liquid-phase loss and avoiding the condition that the initial ratio of liquid-phase source bulks is changed because part of liquid is absorbed by the supporting block, so that the integral growth and superconductivity of the bulk are ensured. The method can be used for preparing the yttrium barium copper oxide bulk superconductor and other series of bulk high temperature superconductors such as Gd, Sm, Nd and the like.

Description

technical field [0001] The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and specifically relates to a 2 BaCuO 5 A method for preparing monodomain yttrium-barium-copper-oxide superconducting bulk material as a base material. Background technique [0002] Monodomain yttrium barium copper oxide (Y-Ba-Cu-O) high-temperature superconducting bulk materials have strong magnetic flux pinning ability, can maintain high critical current density under strong external field, and have high practical value. It has good application prospects in superconducting strong magnets, superconducting magnetic levitation, energy storage flywheels, superconducting motors and generators. In the research process of the preparation of such materials, there are mainly two mainstream processes developed, one is the traditional top-seed melt-textured growth process (TSMTG), and the other is the top-seed melt-textured growth process (TSMTG), which ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/45C04B35/622
Inventor 李国政邓建华董磊
Owner TIANJIN NORMAL UNIVERSITY
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