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Preparation method of single-domain Gd-Ba-Cu-O superconducting block

A technology of gadolinium barium copper oxide and superconducting block, which is applied in the field of high-temperature copper oxide superconducting materials, can solve the problems of increased cost, prolonged preparation period of infiltration growth method, and low carbon content, so as to improve utilization rate and shorten experiment Period, effect of reducing porosity

Active Publication Date: 2012-01-11
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And each kind of precursor powder is prepared by the traditional solid state reaction method, that is, through repeated high-temperature calcination and grinding to obtain a precursor powder with pure phase, low carbon content and small particle size (0.1-10 microns). It takes one week to make, which greatly prolongs the preparation cycle of the infiltration growth method and increases the cost of the experiment

Method used

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  • Preparation method of single-domain Gd-Ba-Cu-O superconducting block
  • Preparation method of single-domain Gd-Ba-Cu-O superconducting block
  • Preparation method of single-domain Gd-Ba-Cu-O superconducting block

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. Preparation of Gd 2 BaCuO 5 Pioneer Powder

[0033] Take 85.0421g Gd 2 O 3 , 46.2957g BaCO 3 , 18.6622g CuO powder mixed, namely Gd 2 O 3 with BaCO 3 , The molar ratio of CuO powder is 1:1:1, and Gd is made by solid-state reaction method. 2 BaCuO 5 pink. Take 100g Gd 2 BaCuO 5 Add powder to ball mill, add Gd 2 BaCuO 5 Powder mass 2% CeO 2 powder, mixed well, prepared as Gd 2 BaCuO 5 Pioneer Powder.

[0034] 2. Preparation of liquid source powder

[0035] Take 106.9053g BaCO 3 , 43.0947g CuO mixed, namely BaCO 3 The molar ratio to CuO powder is 1:1, and BaCuO is made by solid-state reaction method 2 pink. 11.64g Y 2 O 3 Initial powder, 120g BaCuO 2 Powder and 24.6g CuO powder are mixed evenly in the ball mill, namely Y 2 O 3 Initial powder and BaCuO 2 The molar ratio of powder and CuO powder is 1:10:6, which is used as the liquid source powder.

[0036] 3. Suppress Gd 2 BaCuO 5 Pioneer block and liquid phase block

[0037] Take 11g liqui...

Embodiment 2

[0051] in preparation of Gd 2 BaCuO 5 In step 1 of the precursor powder, the preparation of Gd 2 BaCuO 5 The raw materials used in the powder and the preparation method are the same as in Example 1, take 100g Gd 2 BaCuO 5 Add powder to ball mill, add Gd 2 BaCuO 5 Powder mass 1% CeO 2 powder, mixed well, prepared as Gd 2 BaCuO 5 Pioneer Powder. The other steps of this embodiment are the same as those of Embodiment 1. A gadolinium-barium-copper-oxygen superconducting block with a diameter of 20 mm was prepared, and the prepared single-domain gadolinium-barium-copper-oxygen superconducting block was tested for the magnetic levitation force by using a three-dimensional magnetic field and a magnetic force test device, and the magnetic levitation force density reached 8.9N / cm 2 .

Embodiment 3

[0053] suppressing Gd 2 BaCuO 5 Pioneer block and liquid phase block In step 3, take 30g Gd 2 BaCuO 5 Pioneer powder and 30g liquid phase source powder, respectively pressed into Gd with a diameter of 30mm 2 BaCuO 5 Pioneer block and liquid phase block. In pressing the support block step 4, take 4.5g Yb 2 O 3 The powder is pressed into a compact with a diameter of 30mm and a thickness of 2mm as a support block. In the step 6 of growing the single-domain gadolinium barium copper oxide block by infiltration, the assembled precursor block is put into the tube furnace, and the temperature is raised to 800 ℃ at a heating rate of 100 ℃ per hour, and the temperature is kept for 20 hours. The heating rate of 50°C was raised to 1055°C, and the temperature was kept for 1.5 hours; the temperature was lowered to 1035°C at a cooling rate of 60°C per hour, slowly cooled to 1015°C at a cooling rate of 0.2°C per hour, and cooled to room temperature naturally with the furnace to obtain ...

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Abstract

The invention relates to a preparation method of a single-domain Gd-Ba-Cu-O superconducting block. The preparation method comprises the following steps: preparing pioneer powder of Gd2BaCuO5; preparing liquid-phase source powder; preparing pioneer powder of Gd2BaCuO5 and liquid-phase source powder; suppressing a pioneer block of Gd2BaCuO5 and a liquid-phase block; suppressing a supporting block; assembling the pioneer block; infiltrating and growing the single-domain Gd-Ba-Cu-O block; and carrying out oxygen permeation treatment. The invention adopts a top seed crystal permeation growth method and enables the permeation growth process to only need two pioneer powder of Gd2BaCuO5 and BaCuO2 by changing components of the liquid-phase source powder used by the liquid-phase block, thereby simplifying the experimental links, shortening the experimental period, decreasing the experimental cost, saving power resources and improving the efficiency. The method adopts Y2O3 to prepare the liquid-phase source powder and adopts Yb2O3 to prepare the supporting block which stably supports the two blocks in a slow cold growth process of the Gd-Ba-Cu-O block to prevent liquid-phase loss; and the method not only can be used for preparing the Gd-Ba-Cu-O superconducting block but also can be used for preparing high-temperature superconducting blocks of other series, such as Y, Sm, Nd, Eu, and thelike.

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 monodomain gadolinium-barium-copper-oxygen superconducting block materials by a top seed crystal infiltration growth method. Background technique [0002] Monodomain copper oxide high temperature superconducting bulk material (RE-Ba-Cu-O, where RE is a rare earth element, such as Nd, Gd, Y, 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C04B35/50H01B12/00
CPCY02E40/64Y02E40/60
Inventor 杨万民李国政
Owner SHAANXI NORMAL UNIV
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