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A method for preparing single domain yttrium barium copper oxide superconducting bulk material by pure oxide pre-sintering method

A yttrium barium copper oxide and pre-sintering technology is applied in the field of high-temperature cuprate superconducting materials, which can solve the problems of reduced superconductivity of samples, complicated and time-consuming and laborious processes, unfavorable industrial production, etc., so as to avoid macrocracks, save time and Good energy and superconductivity

Active Publication Date: 2019-08-16
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problem of synthesizing Y first in the prior art 2 BaCuO 5 (Y211), YBa 2 Cu 3 o 7-x (Y123) The two kinds of precursor powders have the problems of complicated, time-consuming and labor-intensive processes, high energy consumption, and low efficiency, and the direct use of Y 2 o 3 , BaO and CuO raw materials are mixed with water to prepare the precursor blocks. The raw material powders are very unstable after mixing, the growth conditions are very harsh and cracks are easy to occur, resulting in a decrease in the superconductivity of the sample, which is not conducive to industrial production. The invention provides a pure oxide Method for preparing single-domain yttrium-barium-copper-oxygen superconducting bulk material

Method used

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  • A method for preparing single domain yttrium barium copper oxide superconducting bulk material by pure oxide pre-sintering method
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Embodiment 1

[0032] A method for preparing monodomain yttrium-barium-copper-oxygen superconducting bulk material by pure oxide method, comprising the following steps:

[0033] (1) Preparation of precursor powder by pure oxide pre-sintering method

[0034] Yttrium oxide, barium peroxide, and copper oxide were ball-milled and mixed uniformly at a molar ratio of 0.9:2.4:3.4, kept at 890°C for 10 hours, and then ground as a precursor powder.

[0035] In this example, the precursor powder is obtained by directly mixing the three raw material powders of yttrium oxide, barium peroxide and copper oxide, and then keeping warm under high temperature conditions. The precursor powder can be prepared in 10 hours; Pure YBa 2 Cu 3 o 7-δ , Y 2 BaCuO 5 or BaCuO 2 The precursor powder (it takes about a week to prepare a phase-pure precursor powder), simplifies the process steps, greatly saves time and energy, significantly improves work efficiency, and reduces production costs.

[0036] At the same t...

Embodiment 2

[0050] A method for preparing monodomain yttrium-barium-copper-oxygen superconducting bulk material by pure oxide method, comprising the following steps:

[0051] (1) Preparation of precursor powder by pure oxide pre-sintering method

[0052] Yttrium oxide, barium peroxide, and copper oxide were ball-milled and mixed uniformly at a molar ratio of 0.8:2.2:3.2, kept at 880°C for 20 hours, and ground as a precursor powder.

[0053] In this example, the precursor powder is obtained by directly mixing the three raw material powders of yttrium oxide, barium peroxide and copper oxide, and then keeping warm under high temperature conditions. The precursor powder can be prepared in 20 hours; Pure YBa 2 Cu 3 o 7-δ , Y 2 BaCuO 5 or BaCuO 2 The precursor powder (it takes about a week to prepare a phase-pure precursor powder), simplifies the process steps, greatly saves time and energy, significantly improves work efficiency, and reduces production costs.

[0054] At the same time, ...

Embodiment 3

[0066] A method for preparing monodomain yttrium-barium-copper-oxygen superconducting bulk material by pure oxide method, comprising the following steps:

[0067] (1) Preparation of precursor powder by pure oxide pre-sintering method

[0068] Yttrium oxide, barium peroxide, and copper oxide were ball-milled and mixed uniformly at a molar ratio of 0.9:2.4:3.3, kept at 890°C for 12 hours, and ground as a precursor powder.

[0069] In this example, the precursor powder is obtained by directly mixing the three raw material powders of yttrium oxide, barium peroxide and copper oxide, and then keeping warm under high temperature conditions. The precursor powder can be prepared in 12 hours; Pure YBa 2 Cu 3 o 7-δ , Y 2 BaCuO 5 or BaCuO 2 The precursor powder (it takes about a week to prepare a phase-pure precursor powder), simplifies the process steps, greatly saves time and energy, significantly improves work efficiency, and reduces production costs.

[0070] At the same time, ...

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Abstract

The invention relates to a method for preparing single-domain yttrium-barium-copper-oxide superconducting bulks by pre-sintering pure oxides. The method comprises six steps of preparing precursor powder by pre-sintering pure oxides, preparing precursor blocks, pressing support blocks, assembling a blank body, carrying out growth of the single-domain yttrium-barium-copper-oxide superconducting blocks and carrying out oxygen permeation. Through the method, the precursor powder is prepared by keeping temperature and pre-sintering the pure oxides under the high-temperature condition; compared with the conventional method, phase-pure YBa2Cu3O7-delta, Y2BaCuO5 or BaCuO2 precursor powder needs to be synthesized; the process steps are simplified; the time and the energy are reduced; the operating efficiency is improved; the production cost is reduced; the prepared precursor powder is extremely stable in chemical components, is free of the limit on the condition that the blocks has to be pressed in short time, can be stored for later use, and is suitable for industrial mass production; in addition, the prepared precursor powder can be pressed into blocks by using the conventional method; the atomized deionized water does not need to be sprayed; the harsh experimental conditions are avoided; the generation of macro cracks is also avoided; the prepared products are more excellent in superconducting properties.

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 monodomain yttrium-barium-copper-oxygen superconducting block materials by pre-sintering pure oxides. Background technique [0002] Single-domain rare earth copper oxide high-temperature superconducting bulk material has a critical temperature of about 92K, a high upper critical magnetic field and an unimpeded current-carrying capacity. This advantage has laid the foundation for the application of this type of material in superconducting magnets and superconducting magnetic levitation, etc., and its development in recent years also makes it have a good application prospect. [0003] At present, the methods for preparing single-domain copper oxide superconducting bulk materials mainly include top-seed melt-textured growth (TSMTG) and top-seed infiltration growth (TSIG) two completely different proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B11/02
CPCC30B11/02C30B29/225
Inventor 李佳伟杨万民
Owner SHAANXI NORMAL UNIV
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