Method for preparing REBa2Cu3Ox (REBCO) high-temperature superconducting block material

A bulk material and high-temperature superconducting technology, applied in the field of melting texture growth of REBCO high-temperature superconducting bulk materials, can solve the problems of REBCO high-temperature superconducting bulk materials growth failure and other problems, and achieve superior superconducting performance and growth rate. inhibiting effect

Inactive Publication Date: 2012-07-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a melting texture growth method for REBCO high temperature superconducting bulk materials, which reduces the excessive supersaturation generated when the temperature drops from the highest temperature to the growth interval, so as to solve the problem that the existing melting texture growth method suffers from Spontaneous nucleation occurs when the highest temperature is lowered to the growth temperature, leading to technical problems in the growth failure of REBCO high-temperature superconducting bulk materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: NdBCO / YBCO / MgO film as seed crystal melt texture growth GdBCO high temperature superconducting bulk material

[0039] 1), according to Gd123+25mol%Gd211+15wt%Ag component batching;

[0040] 2), grinding, calcination at 910°C for 48 hours, and then grinding, calcination at 910°C for 48 hours;

[0041] 3) Press into a circular pie-shaped structure of φ20×8mm, add a 2mm*2mm NdBCO / YBCO / MgO film on the top as a seed crystal, and put the whole system into a growth furnace;

[0042] 4), heat up to 1095°C in 4 hours, keep warm for 2.5 hours, quickly cool down to 1055°C at a rate of 60-150°C / h, keep warm for 20 minutes, then quickly cool down to 1016°C at a rate of 60-150°C / h, keep warm After 70 hours, it was quenched (the temperature was lowered to room temperature at a cooling rate of 200-300° C. / h) to obtain a monodomain GdBCO high-temperature superconducting bulk material.

[0043] The physical and chemical characteristics of the high-temperature superconducting...

Embodiment 2

[0044] Example 2: NdBCO / YBCO / MgO film as seed crystal melt texture growth NdBCO high temperature superconducting bulk material

[0045] 1. Dosing according to Nd123+35mol% Nd211+15wt%Ag;

[0046] 2. Grinding, calcination at 900°C for 50 hours, grinding again, and calcination at 900°C for 50 hours;

[0047] 3. Press into a circular cake-shaped structure of φ20×8mm, add a 2mm*2mm NdBCO / YBCO / MgO film on the top as a seed crystal, and put the whole system into the growth furnace;

[0048]4. Heat up to 1115°C in 5 hours, hold for 3 hours, quickly cool down to 1085°C at a rate of 60-150°C / h, hold for 30 minutes, then quickly cool down to 1054°C at a rate of 60-150°C / h, and hold for 60 Hours, quenching (the temperature is lowered to room temperature at a cooling rate of 200-300° C. / h) to obtain a monodomain NdBCO high-temperature superconducting bulk material.

[0049] The physical and chemical characteristics of the high-temperature superconducting bulk material prepared in this e...

Embodiment 3

[0050] Example 3: NdBCO / YBCO / MgO film as seed crystal melt texture growth SmBCO high temperature superconducting bulk material

[0051] 1. According to the composition of Sm123+30mol%Sm211+15wt%Ag;

[0052] 2. Grinding, heat preservation at 890°C for 50 hours for calcination, re-grinding, and second calcination with the same process;

[0053] 3. Press into a circular cake-shaped structure of φ30×10mm, add 2mm*2mm NdBCO / YBCO / MgO film as a seed crystal on the top, and put the whole system into the growth furnace;

[0054] 4. Heat up to 1110°C in 4 hours, hold for 2 hours, quickly cool down to 1075°C at a rate of 60-150°C / h, hold for 10 minutes, then quickly cool down to 1040°C at a rate of 60-150°C / h, and hold for 80 hours, quenching (reducing the temperature to room temperature at a cooling rate of 200-300° C. / h) to obtain a monodomain SmBCO high-temperature superconducting bulk material.

[0055] The physical and chemical characteristics of the high-temperature superconducti...

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PUM

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Abstract

The invention relates to a method for preparing a REBa2Cu3Ox (REBCO) high-temperature superconducting block material, in particular to a melt texture growth (MTG) method for the REBCO high-temperature superconducting block material. The MTG method for the REBCO high-temperature superconducting block material comprises the following steps of: a) mixing raw materials; b) grinding and calcining to obtain a superconducting material rough blank; c) tabletting; d) firing; and e) cooling to obtain the REBCO high-temperature superconducting block material, namely e1) cooling to buffer temperature, and preserving heat, e2) cooling to growth temperature, and preserving heat, and e3) quenching. By the method, the technical problem that the REBCO high-temperature superconducting block material fails to grow because spontaneous nucleation is generated when temperature is reduced from the maximum temperature to the growth temperature in the conventional MTG method is solved.

Description

technical field [0001] The invention relates to a preparation method of a REBCO high-temperature superconducting bulk material, in particular to a melting texture growth method of the REBCO high-temperature superconducting bulk material. Background technique [0002] Rare earth barium copper oxide (REBa 2 Cu 3 Ox, REBCO) high-temperature superconducting bulk materials have many potential applications in areas such as magnetic levitation forces, magnetic bearings, flywheel energy storage, and permanent magnets. At the application level, the requirements for bulk materials are generally larger size and higher critical current density (Jc). Therefore, the preparation of large-scale superconducting bulk materials is the key to restricting the practical application of bulk materials. The melt texture method (MTG) is generally considered to be a very potential preparation method of rare earth barium copper oxide high temperature superconducting bulk materials. In the process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/45C04B35/50
Inventor 姚忻颜士斌程玲李天宇
Owner SHANGHAI JIAO TONG UNIV
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