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Low-cost preparation method of single-domain gadolinium barium copper oxide superconducting bulk material

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 long preparation time, high cost, and complicated operation, so as to save cost and time, shorten preparation time, and simplify operation The effect of steps

Active Publication Date: 2014-11-12
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent 201110060866 discloses a method for preparing a high-temperature superconducting bulk material by using a high-thermal-stability film as the seed crystal of the melt-texturing method. Specifically, a high-thermal-stability film seed crystal is used to induce the growth of a single-domain superconducting bulk material, but the pioneer The block is still made by mixing two pre-sintered powders in a certain molar ratio. This method is complicated to operate and expensive to experiment.
At the same time, before using this method to prepare single-domain GdBCO superconducting bulk materials, GdBa must first be prepared 2 Cu 3 o 7-δ and Gd 2 BaCuO 5 Two kinds of precursor powders, and the traditional solid-state sintering method to prepare the precursor powder is mainly to obtain a phase-pure precursor powder with a small particle size through repeated high-temperature sintering and grinding. This method takes a long time to prepare, has low efficiency, and is relatively expensive. Higher, so it will lead to the whole process time-consuming, high cost, low efficiency

Method used

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  • Low-cost preparation method of single-domain gadolinium barium copper oxide superconducting bulk material
  • Low-cost preparation method of single-domain gadolinium barium copper oxide superconducting bulk material
  • Low-cost preparation method of single-domain gadolinium barium copper oxide superconducting bulk material

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Experimental program
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Effect test

Embodiment 1

[0032] 1. Press the pioneer block

[0033] Take 20gGd 2 o 3 , 22.5867g anhydrous BaO, 16.5894gCuO, put into the ball mill and mix evenly, as the precursor powder, Gd 2 o 3 The molar ratio to anhydrous BaO and CuO is 1:2.67:3.78. Take 15g of precursor powder, add 0.75g of deionized water, grind evenly, and press it into a cylindrical precursor block with a diameter of 20mm at 4MPa with a powder tablet press .

[0034] 2. Compression support block

[0035] Take 2gYb 2 o 3 Powder, compressed into a cylindrical support block with a diameter of 20mm under 4MPa with a powder tablet press.

[0036] 3. Body assembly

[0037] Al with a diameter of 10 cm and a thickness of 6 mm 2 o 3 Place 4 pieces of 5mm×5mm×5mm MgO single wafers on the upper surface of the spacer, then place the support block and the pioneer block on the MgO single wafer from bottom to top, and place a 2mm×2mm×2mm wafer on the center of the upper surface of the pioneer block. Neodymium barium copper oxide s...

Embodiment 2

[0045] In the pressed precursor block step 1 of embodiment 1, take 20gGd 2 o 3 , 16.9189g of anhydrous BaO and 11.7179g of CuO, put into a ball mill and mix evenly, as a precursor powder, Gd 2 o 3 The molar ratio to anhydrous BaO and CuO is 1:2:2.67. Take 15g of precursor powder, add 0.75g of deionized water, grind evenly, and press it into a cylindrical precursor block with a diameter of 20mm at 4MPa with a powder tablet press . Other steps are identical with embodiment 1, are prepared into monodomain gadolinium barium copper oxide superconducting block material (photograph sees image 3 ). Depend on figure 2 It can be seen that when Z=0.01mm, the magnetic levitation force of the prepared single-domain gadolinium barium copper oxide superconducting block is the largest, which is 5.0449N, and the corresponding magnetic levitation force density is 2.5104N / cm 2 .

Embodiment 3

[0047] In the pressed precursor block step 1 of embodiment 1, take 20gGd 2 o 3 , 18.1878g of anhydrous BaO and 12.8151g of CuO, put into the ball mill and mix evenly, as the precursor powder, Gd 2 o 3 The molar ratio to anhydrous BaO and CuO is 1:2.15:2.92, take 15g of the precursor powder, add 0.75g of deionized water, grind it evenly, and press it into a cylindrical precursor block with a diameter of 20mm at 4MPa with a powder tablet press . Other steps are identical with embodiment 1, are prepared into monodomain gadolinium barium copper oxide superconducting block material (photograph sees Figure 4 ). Depend on figure 2 It can be seen that when Z=0.01mm, the magnetic levitation force of the prepared single-domain gadolinium barium copper oxide superconducting block is the largest, which is 7.9707N, and the corresponding magnetic levitation force density is 3.9663N / cm 2 .

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Abstract

The invention provides a low-cost preparation method of a single-domain gadolinium barium copper oxide superconducting bulk material. The low-cost preparation method comprises the following steps of: preparing a single-domain gadolinium barium copper oxide bulk material by adopting a top seeded-metal oxides melt growth (TS-MOMG for short) method, directly melting and reacting three metallic oxides (Gd2O3, anhydrous BaO and CuO) at a high temperature, and carrying out epitaxial growth through seed crystal induction so as to complete the growth of the single-domain gadolinium barium copper oxide superconducting bulk material. According to the low-cost preparation method, no precursor powder needs to be sintered in the whole melting and growth process, the preparation time is greatly shortened on the premise that the property of the superconducting bulk material is not reduced, operation steps are simplified, the preparation efficiency of the superconducting bulk material is improved, and the preparation cost of the single-domain superconducting bulk material is reduced. The low-cost preparation method can be used for preparing the gadolinium barium copper oxide superconducting bulk material and can also be used for preparing high-temperature superconducting bulk materials of other series, such as Yb, Y, Sm, Nd and Eu.

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 reducing the cost of monodomain gadolinium-barium-copper-oxygen superconducting bulk materials. Background technique [0002] In the process of preparing single-domain copper oxide superconducting bulk materials, the most widely used process is the traditional Top Seeded Melt Textured Growth process (Top Seeded Melt Textured Growth referred to as TSMTG). The method is a process of adding seed crystals to assist in controlling spontaneous nucleation and orientation growth, so that the high-temperature superconducting bulk material grows in a textured manner. Because the high-temperature superconducting bulk material grown by the TSMTG method has the advantages of obtaining single-domain large volume and high critical current density, this method is widely used in various countries in the world to obtain large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/00C04B35/45C04B35/50C04B35/622
CPCY02E40/60
Inventor 杨万民王妙李佳伟杨志娟
Owner SHAANXI NORMAL UNIV