Preparation method of nano composite ytrium barium copper oxide superconducting bulks

A yttrium barium copper oxide and nanocomposite technology is applied in the field of preparation of nanocomposite yttrium barium copper oxide superconducting bulk materials, can solve the problems of unreachable, unimpeded current-carrying capacity limitation, slow growth and solidification process, etc., and achieves high efficiency , the process is simple, the effect of high superconductivity

Inactive Publication Date: 2015-06-24
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, people have tried to convert the nanoscale RE 2 BaCuO 5 The precursor powder is doped into the REBCO superconducting bulk material, however, due to the REBa 2 Cu 3 o 7?δ The crystal growth and solidification process is very slow, RE 2 BaCuO 5 Particles enriched in RE 3+ The Ba-Cu-O liquid phase will undergo a serious Ostwald coarsening and growth process, and the RE captured in the final sample 2 BaCuO 5 The average particle size of the particles is still increased to between submicron and 1 micron, which cannot play the most effective role of magnetic flux pinning
If there is no strong enough magnetic flux pinning center in the superconducto

Method used

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  • Preparation method of nano composite ytrium barium copper oxide superconducting bulks
  • Preparation method of nano composite ytrium barium copper oxide superconducting bulks
  • Preparation method of nano composite ytrium barium copper oxide superconducting bulks

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of solid phase powder:

[0028] Mix 65.8415g BaO and 34.1585g CuO primary powder evenly, that is, the molar ratio of BaO and CuO primary powder is 1:1, and make BaCuO by solid state reaction method 2 Precursor powder; take 39.3842g Y 2 o 3 Nano powder (average particle size 50nm) and 40.6158g BaCuO 2 Mix the precursor powder and add 0.8g CeO at the same time 2 Initial powder, ie Y 2 o 3 Nanopowder and BaCuO 2 The molar ratio of the precursor powder is 1:1, and 1% (w / w) CeO is added at the same time 2 Initial powder, mixed evenly, as solid phase powder;

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

[0030] Take 9.8517g Yb 2 o 3 Mix evenly with 38.3308g BaO, 31.8175g CuO initial powder, namely Yb 2 o 3 The molar ratio of BaO and CuO initial powder is 1:10:16, as the liquid phase source powder;

[0031] (3) Press the precursor block:

[0032] Take 5g of solid phase powder into cylindrical mold 1 (diameter 16mm) and press it into a sol...

Embodiment 2

[0043] In step (1) of preparing solid phase powder, prepare BaCuO 2 The raw materials used for the precursor powder and the preparation method are the same as in Example 1, and then 39.3842g Y 2 o 3 Nano powder (average particle size 50nm) and 40.6158g BaCuO 2 Mix the precursor powder and add 0.4g CeO at the same time 2 Initial powder, ie Y 2 o 3 Nanopowder and BaCuO 2 The molar ratio of the precursor powder is 1:1, and 0.5% (w / w) CeO is added at the same time 2 The initial powder, mixed evenly, is used as solid phase powder.

[0044] In the step (3) of pressing the precursor block, take 5g of solid phase powder and put it into cylindrical mold 1 (diameter 16mm) to press into a solid phase block; take 12.5g of liquid phase source powder and put it into cylindrical mold 2 (diameter 26mm) , pressed into a liquid phase source block; that is, the mass ratio of the solid phase powder to the liquid phase source powder is 1:2.5, and the diameter of the cylindrical mold 2 is 10...

Embodiment 3

[0048] In step (1) of preparing solid phase powder, prepare BaCuO 2 The raw materials used for the precursor powder and the preparation method are the same as in Example 1, and then 39.3842g Y 2 o 3 Nano powder (average particle size 50nm) and 40.6158g BaCuO 2 Mix the precursor powder and add 1.2g CeO at the same time 2 Initial powder, ie Y 2 o 3 Nanopowder and BaCuO 2 The molar ratio of the precursor powder is 1:1, and 1.5% (w / w) CeO is added at the same time 2 The initial powder, mixed evenly, is used as solid phase powder.

[0049] In the step (3) of pressing the precursor block, take 5g of solid phase powder and put it into cylindrical mold 1 (diameter 16mm) to press into a solid phase block; take 17.5g of liquid phase source powder and put it into cylindrical mold 2 (diameter 26mm) , pressed into a liquid phase source block; that is, the mass ratio of the solid phase powder to the liquid phase source powder used is 1:3.5, and the diameter of the cylindrical mold 2 ...

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Abstract

The invention discloses a preparation method of nano composite ytrium barium copper oxide superconducting bulks, which comprises the steps of preparing solid phase powder, preparing liquid phase source powder, pressing precursor bulks, assembling the precursor bulks, carrying out infiltrated growth on nano composite ytrium barium copper oxide single-domain bulks, and carrying out oxygen permeation treatment. By taking a mixture of Y2O3 nano powder, BaCuO2 precursor powder and CeO2 initial powder as solid phase powder, after high-temperature infiltration and slowly-cooled growth are performed, nanoscale Y2BaCuO5 particles are successfully introduced into ytrium barium copper oxide superconducting bulks, so that higher superconducing properties are obtained. By taking a mixture of Yb2O3, and BaO, CuO initial powder as liquid phase source powder, the whole infiltrated growth process is implemented by only using BaCuO2 precursor powder, so that the method is simple in process and high in efficiency. The invention also can be used for preparing nano composite superconducting materials of Nd, Sm and Gd series 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 a method for preparing a nanocomposite yttrium-barium-copper-oxygen superconducting bulk material. Background technique [0002] The single-domain RE-Ba-Cu-O (REBCO, RE=Y, Gd, Sm, Nd, etc.) high-temperature superconducting bulk material guided by top-seed technology effectively solves the problem of grain boundaries in polycrystalline samples and multi-domain samples The "weak connection" phenomenon that exists at the place can carry a higher body critical current, showing higher magnetic flux capture and magnetic levitation performance. It has broad application prospects. [0003] By doping RE 2 BaCuO 5 Precursor powder in REBa 2 Cu 3 o 7?δ Introducing Diffusely Distributed Tiny REs into a Superconducting Matrix 2 BaCuO 5 Particles can significantly improve the flux pinning ability of REBCO superconducting bulk ...

Claims

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Application Information

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IPC IPC(8): C04B35/45C04B35/622H01B12/00
CPCY02E40/60
Inventor 李国政
Owner TIANJIN NORMAL UNIVERSITY
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