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Simplified preparation method of single-domain YBCO (Yttrium Barium Copper Oxide) superconducting bulk material

A superconducting block and single domain technology, applied in the field of high-temperature cuprate superconducting materials, can solve the problems of complicated and time-consuming, labor-intensive, low-efficiency, and high energy consumption, saving time and energy, simplifying process steps, and improving work efficiency Effect

Active Publication Date: 2014-12-24
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, two precursor powders, Y211 and Y123, must be prepared before the preparation of YBCO blocks. In order to ensure the purity of the precursor powder, multiple sintering and grinding are required, so the process is complicated, time-consuming, laborious, high energy consumption, and low in efficiency.

Method used

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  • Simplified preparation method of single-domain YBCO (Yttrium Barium Copper Oxide) superconducting bulk material
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  • Simplified preparation method of single-domain YBCO (Yttrium Barium Copper Oxide) superconducting bulk material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Prepare the pioneer block

[0030] 13.04g Y 2 O 3 , 23.61g BaO, 17.35g CuO into the agate jar, Y 2 O 3 The molar ratio with BaO and CuO is 1:2.67:3.78. Use a ball mill to mix evenly. As the precursor powder, take 13g of the precursor powder and place it in a mortar, spray 0.78g of deionized water, and grind it evenly. Press 4MPa pressure to form a cylindrical precursor block with a diameter of 20mm.

[0031] 2. Suppress the support block

[0032] 2.5g Yb 2 O 3 Use a tablet press to press a cylindrical support block with a diameter of 20 mm under a pressure of 4 MPa.

[0033] 3. Assembly of the blank

[0034] In Al with a diameter of 10cm and a thickness of 6mm 2 O 3 Place three 5mm×5mm×5mm MgO single crystal blocks on the upper surface of the gasket, and then place the support block and the precursor block on the upper surface of the MgO single crystal from bottom to top, and place neodymium barium copper oxygen on the upper surface of the precursor block. The seed crystal i...

Embodiment 2

[0041] In the preparation step 1 of the precursor block in Example 1, 8.3394g Y 2 O 3 , 11.3261g BaO, 7.8344g CuO into the agate jar, Y 2 O 3 The molar ratio with BaO and CuO is 1:2:2.67. Use a ball mill to mix evenly. As a precursor powder, take 13g of the precursor powder and place it in a mortar, spray 0.78g of deionized water, and grind it evenly. Press 4MPa pressure to form a cylindrical precursor block with a diameter of 20mm. The other steps are the same as in Example 1, and the monodomain YBCO superconducting bulk material is prepared (see figure 2 ), when Z=0.01mm, its magnetic levitation force is the largest, 12.8019N (see Figure 7 ), the corresponding magnetic levitation force density is 6.3671N / cm 2 .

Embodiment 3

[0043] In the step 1 of preparing the precursor block in Example 1, 5.1954g Y 2 O 3 , 12.3481g BaO, 9.4565g CuO into the agate jar, Y 2 O 3 The molar ratio with BaO and CuO is 1:3.5:5.17. Use a ball mill to mix it evenly. As the precursor powder, take 13g of the precursor powder and place it in a mortar. Spray 0.78g of deionized water to grind it evenly. Press 4MPa pressure to form a cylindrical precursor block with a diameter of 20mm. The other steps are the same as in Example 1, and the monodomain YBCO superconducting bulk material is prepared (see image 3 ), when Z=0.01mm, its magnetic levitation force is the largest, 16.8093N (see Figure 7 ), the corresponding magnetic levitation force density is 8.3602N / cm 2 .

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Abstract

The invention provides a simplified preparation method of a single-domain YBCO (Yttrium Barium Copper Oxide) superconducting bulk material. The simplified preparation method comprises the following steps of: preparing a single-domain YBCO bulk material by adopting a top seeded-metal oxides melt growth (TS-MOMG for short) method, directly carrying out solid phase reaction on three metallic oxides (Y2O3, BaO and CuO) in the temperature rising period of crystal growth to freely synthesize YBa2Cu3O7-delta and Y2BaCuO5, and carrying out epitaxial growth through seed crystal induction in a subsequent temperature reduction process so that a texture grows into the single-domain bulk material. According to the simplified preparation method, two precursor powders, namely YBa2Cu3O7-delta and Y2BaCuO5, do not need to be synthesized separately in the growth process of the whole superconducting bulk material, the synthesis of the precursor powder and the growth of the single-domain bulk material are integrated in a thermal treatment process, process steps are simplified, and time and energy sources are saved. The simplified preparation method can be used for preparing the YBCO superconducting bulk material and can also be used for preparing other high-temperature superconducting bulk materials in the same series, such as Gadolinium Barium Copper Oxide, Samarium Barium Copper Oxide, Neodymium Barium Copper Oxide and Ytterbium Barium Copper Oxide.

Description

Technical field [0001] The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and specifically relates to a method for preparing single-domain yttrium barium copper oxide (YBCO) superconducting bulk materials by a simplified top seed crystal melting texture growth method. Background technique [0002] Single domain rare earth barium copper oxide high temperature superconducting bulk material (REBa 2 Cu 3 O 7-δ , Where RE is a rare earth element, such as Y, Gd, Sm, Nd, etc.) has a critical temperature above 90K, a high upper critical magnetic field and no-block current-carrying capacity. This advantage lays the foundation for the application of such materials in magnetic levitation technology, especially in the development of superconducting magnetic bearings, energy storage flywheels, and superconducting motors and generators. [0003] At present, the methods for preparing single-domain copper oxide superconducting bulk materials ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/45C04B35/50C04B35/622
Inventor 杨万民李佳伟蒲茹杨志娟王妙马斌李哲刘赢杨媚
Owner SHAANXI NORMAL UNIV