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Preparation method of monodomain gadolinium barium copper oxide superconducting bulk material which is easy to remove liquid source residue

A technology of gadolinium barium copper oxygen and liquid phase source, which is applied in the direction of chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the loss of oxygen element in the phase, the inaccurate separation position of the cutting method, and the influence of superconducting bulk materials Performance and other issues, to achieve the effect of simplifying the cutting process and easy separation

Active Publication Date: 2018-09-28
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Single-domain gadolinium-barium-copper-oxygen superconducting blocks can be grown through the top seed crystal infiltration growth technology, but the research group of the inventor has previously applied for single-domain monodomain A series of patents on the preparation method of gadolinium barium copper oxide superconducting block. During the actual experimental operation, the researchers found that it would be difficult to separate the solid phase block from the liquid phase residual block. The cutting method was used to separate, but the cutting method exists The disadvantage that the separation position is not accurate enough, and the friction between the block and the grinding disc may cause GdBa 2 Cu 3 o 7-δ The loss of oxygen in the phase, which affects the performance of superconducting bulk materials

Method used

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  • Preparation method of monodomain gadolinium barium copper oxide superconducting bulk material which is easy to remove liquid source residue
  • Preparation method of monodomain gadolinium barium copper oxide superconducting bulk material which is easy to remove liquid source residue
  • Preparation method of monodomain gadolinium barium copper oxide superconducting bulk material which is easy to remove liquid source residue

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Experimental program
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Embodiment 1

[0050] 1), preparation of solid phase source powder

[0051] Take 213.8218g BaCO 3 , 86.1872g CuO mixed, namely BaCO 3 The molar ratio with CuO powder is 1:1, and BaCuO is prepared by solid state reaction method 2 pink. Take 150.0000g Y 2 o 3 Primary powder, 115.6330g BaCuO 2 The powder is mixed evenly in the ball mill, that is, Y 2 o 3 Primary powder and BaCuO 2 The molar ratio of the powder is 1:1.2, as the solid phase source powder.

[0052] 2), preparation of liquid phase source powder

[0053] Take 20.0000g Y 2 o 3 Primary powder, 206.2545g BaCuO 2 Powder, 142.2721g CuO powder are mixed evenly in the ball mill, that is, Y 2 o 3 Primary powder and BaCuO 2 The molar ratio of CuO powder and CuO powder is 1:10:6, which is used as the liquid phase source powder.

[0054] 3), pressed solid phase precursor block

[0055] Take 15.0g of solid phase source powder and press it into a cylindrical solid phase precursor block 2 with a diameter of 20.0mm. The mass ratio...

Embodiment 2

[0072] In step 2 of preparing liquid phase source powder, BaCuO 2 Ba 3 Cu 5 o 8 , as a Y-free base liquid phase source powder. Other steps of this embodiment are the same as in Embodiment 1.

[0073] The monodomain gadolinium-barium-copper-oxygen superconducting bulk material prepared in Example 2, the surface morphology is photographed with a camera, and the surface morphology photo is shown in Figure 4 . Depend on Figure 4 It can be seen that the four diameters on the surface of the sample are clear, the radial lines are radial, and the angle between the radial lines (the angle of the sector) is 90°, and there is no spontaneous nucleation phenomenon. The photos after separation are shown in Figure 5 ,From Figure 5 It can be seen that the solid phase block is well separated from the whole block.

Embodiment 3

[0075] In the step 4) of pressing the liquid-phase source precursor block liquid containing round holes in Example 1, the number of round holes in the cylindrical liquid-phase source precursor block (4) containing round holes is 3, and the 3 round holes are evenly distributed. Disperse in liquid source precursor block.

[0076] suppressing Y 2 o 3 In step 5) of the cylindrical pillar, Y 2 o 3 The diameter of the pillar (3) is 5mm, the height is 8mm, and the number is 3, Y 2 o 3 The diameter of pillar (3) is slightly smaller than the diameter of circular hole in the liquid source precursor block (4) that contains circular hole in described step 4); Y 2 o 3 The length of the pillar (3) is slightly greater than or equal to the depth of the circular hole in the liquid phase source precursor block (4) containing the circular hole.

[0077] Other steps are identical with embodiment 1.

[0078] The liquid phase and Y of gadolinium barium copper oxygen sample in embodiment 3 ...

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Abstract

The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and particularly relates to a single-domain gadolinium, barium and copper oxide superconducting bulk material with easiness in removing liquid-phase source residues and a method for preparing the single-domain gadolinium, barium and copper oxide superconducting bulk material. The method includes steps of preparing solid-phase source powder; preparing liquid-phase source powder; compressing solid-phase precursor blocks; compressing liquid-phase source precursor blocks with circular holes; compressing Y2O3 cylindrical struts; compressing Yb2O3 support blocks; preparing neodymium, barium and copper oxide seed crystals; assembling the precursor blocks; carrying out infiltration growth to obtain a single-domain gadolinium, barium and copper oxide bulk material; carrying out oxygen diffusion treatment. The single-domain gadolinium, barium and copper oxide superconducting bulk material and the method have the advantages that a novel technology for assembling the precursor blocks is provided, accordingly, infiltration can be carried out on liquid phases in the liquid-phase source precursor blocks, growth of the single-domain gadolinium, barium and copper oxide superconducting bulk material can be guaranteed, and the grown single-domain gadolinium, barium and copper oxide superconducting bulk material can be easily separated from liquid-phase source residual blocks; follow-up removal processing procedures for the liquid-phase source residual block can be greatly simplified, and the grown single-domain gadolinium, barium and copper oxide superconducting bulk material can be prevented from being possibly destroyed in separation procedures.

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 monodomain gadolinium-barium-copper-oxygen superconducting bulk material which is easy to remove residual liquid phase source. Background technique [0002] Monodomain rare earth barium copper oxide high temperature superconducting bulk material (RE-Ba-Cu-O, where RE is a rare earth element, such as Nd, Sm, Gd, Y, etc.) has a high critical temperature and critical current density, and in the strong Strong magnetic flux pinning ability under magnetic field. 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 ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B1/10C30B11/04C30B33/02
CPCC30B1/10C30B11/04C30B29/22C30B33/005C30B33/02
Inventor 杨万民杨芃焘
Owner SHAANXI NORMAL UNIV