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Preparation of single domain SmBCO superconduction block material

A samarium barium copper oxide, superconducting block technology, which is applied in the field of superconducting bulk material preparation, can solve the problems of inability to precisely control the REBCO texture formation process, etc., and achieves low maximum temperature requirements, good repeatability, and maximum melting. low temperature effect

Inactive Publication Date: 2009-01-21
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some research groups use MgO single crystals to guide the growth of samples. Although the melting point of MgO single crystals is higher than that of any REBCO bulk superconductor, it is not suitable for seed crystals, and its lattice parameters do not match those of REBCO compounds. degree reaches 10%, which belongs to the semi-coherent interface, which leads to the random nucleation of RE123, so the formation process of the REBCO texture cannot be precisely controlled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] From the Nd-Ba-Cu-Mg-O sintered block with 1wt% MgO powder added as the matrix, small grains with a size of 2 mm × 2 mm and (001) crystal planes were cleaved as seeds crystal. Samarium barium copper oxide pre-melt adopts Sm 2 BaCuO 5 Phase, BaCuO 2 The phase and CuO were prepared according to the molar ratio of Sm:Ba:Cu=1.6:2.3:3.3, and 1wt% CeO was added at the same time 2 , mix the powder evenly, and uniaxially press it into a samarium barium copper oxide block with a size of Φ20mm×10mm. The Nd-Ba-Cu-Mg-O seed crystal is placed in the center of the surface of the samarium barium copper oxide prefrit to guide the directional growth of the samarium barium copper oxide bulk material. Put the samarium-barium-copper-oxygen premelt together with the Nd-Ba-Cu-Mg-O seed crystal in a six-sided heating furnace, heat up rapidly at a rate of 300°C / h, keep it at 1070°C for 2h, and then start from the solidification temperature of 1050°C ℃ began to cool slowly at a rate of 1°C...

Embodiment 2

[0016] From the Nd-Ba-Cu-Mg-O sintered block with 1wt% MgO powder added as the matrix, small grains with a size of 2 mm × 2 mm and (001) crystal planes were cleaved as seeds crystal. Samarium barium copper oxide pre-melt adopts Sm 2 BaCuO 5 Phase, BaCuO 2 The phase and CuO were prepared according to the molar ratio of Sm:Ba:Cu=1.6:2.3:3.3, and 1wt% CeO was added at the same time 2 , mix the powder evenly, and uniaxially press it into a samarium barium copper oxide block with a size of Φ30mm×10mm. The Nd-Ba-Cu-Mg-O seed crystal is placed in the center of the surface of the samarium barium copper oxide prefrit to guide the directional growth of the samarium barium copper oxide bulk material. Put the samarium-barium-copper-oxygen premelt together with the Nd-Ba-Cu-Mg-O seed crystal in a six-sided heating furnace, heat up rapidly at a rate of 300°C / h, keep it at 1075°C for 3h, and then start from the solidification temperature of 1050°C ℃ began to cool slowly at a rate of 0.5...

Embodiment 3

[0018] From the Nd-Ba-Cu-Mg-O sintered block with 2wt% MgO powder added as the matrix, small grains with a size of 2 mm × 2 mm and (001) crystal planes were cleaved as seeds crystal. Samarium barium copper oxide pre-melt adopts Sm 2 BaCuO 5 Phase, BaCuO 2 The phase and CuO were prepared according to the molar ratio of Sm:Ba:Cu=1.6:2.3:3.3, and 1wt% CeO was added at the same time 2 , mix the powder evenly, and uniaxially press it into a samarium barium copper oxide block with a size of Φ20mm×10mm. The Nd-Ba-Cu-Mg-O seed crystal is placed in the center of the surface of the samarium barium copper oxide prefrit to guide the directional growth of the samarium barium copper oxide bulk material. Put the samarium-barium-copper-oxygen premelt together with the Nd-Ba-Cu-Mg-O seed crystal in a six-sided heating furnace, heat up rapidly at a rate of 300°C / h, keep it at 1070°C for 2h, and then start from the solidification temperature of 1050°C ℃ began to cool slowly at a rate of 1°C...

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PUM

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Abstract

The invention provides a method for preparing single-domain samarium-barium-copper-oxygen (Sm-Ba-Cu-O) superconducting bulk materials. The method is characterized in that neodymium, barium, copper and oxygen to which MgO powder is added are adopted as seed crystals; a Sm2BaCuO5 phase, a BaCuO2 phase and a CuO phase are prepared according to a certain molar ratio, and a proper amount of CeO2 powder is added at the same time; the materials are evenly mixed and then are pressed in the uniaxial direction so as to be made into a Sm-Ba-Cu-O pre-melted block; and the pre-melted block grows into a Sm-Ba-Cu-O bulk material having a single-domain structure through a powder melting process, and then is turned into a single-domain Sm-Ba-Cu-O superconducting bulk material via oxygen annealing treatment. The Sm-Ba-Cu-O superconducting bulk material prepared by use of the method is good in technical repeatability and relatively lower in requirement on the maximum temperature of equipment, and the method is easier to obtain a bulk material sample having appearance of a single-domain structure.

Description

technical field [0001] The invention relates to a preparation method of a superconducting bulk material, in particular to a preparation method of a monodomain samarium barium copper oxide superconducting bulk material. Background technique [0002] Among all rare earth barium copper oxide (REBCO, RE:Y, Nd, Sm, Eu, Gd) high temperature superconducting materials, Sm-Ba-Cu-O is a very attractive material because it has more High superconducting transition temperature and magnetic flux trapping performance, with higher critical current density at high field. At the same time, SmBaCuO is also widely used as a cold seed crystal for the preparation of YBCO superconducting bulk. Since SmBa 2 Cu 3 o 7-δ The (Sm123) phase has a higher melting temperature, and it is impossible to use traditional NdBaCuO as a cold seed to prepare monodomain Sm-Ba-Cu-O bulk, because the difference between the two melting temperatures is only 26 °C. If the complete decomposition of the Sm123 phase is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/45H01B12/00
CPCY02E40/64Y02E40/60
Inventor 徐晓燕卢亚锋冯建情张翠萍于泽铭熊晓梅
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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