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Method for quickly growing REBCO high-temperature superconducting block by stepped slow cooling acceleration

A technology for accelerated slow cooling and high-temperature superconductivity, applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve problems such as spontaneous nucleation, insufficient driving force, and slow growth rate, etc., with simple methods and shortened time , easy-to-operate effect

Inactive Publication Date: 2013-04-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to unreasonable cooling rate control and insufficient driving force for bulk growth, the growth rate of RE123 is very low, and it takes a long time to obtain a large-sized superconducting bulk; and too long growth time will lead to the second Grain coarsening of phase RE211 affects bulk properties
Simply increasing the cooling rate, although it can provide enough driving force, can shorten the growth time to some extent, but it will also cause the problem of spontaneous nucleation
Moreover, it does not solve the problem that the growth rate slows down and eventually stops due to the gradual enrichment of the second phase at the growth front.

Method used

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  • Method for quickly growing REBCO high-temperature superconducting block by stepped slow cooling acceleration
  • Method for quickly growing REBCO high-temperature superconducting block by stepped slow cooling acceleration
  • Method for quickly growing REBCO high-temperature superconducting block by stepped slow cooling acceleration

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Embodiment 1

[0033] 1. According to the ratio of Sm:Ba:Cu=1:2:3 and Sm:Ba:Cu=2:1:1, Sm 2 o 3 、BaCO 3 Mix with CuO powder to obtain Sm123 phase and Sm211 phase powder, according to the ratio of Sm:Ba:Cu=2:4:2, Sm 2 o 3 、BaO 2 Mix with CuO powder to obtain Sm242 phase powder, according to the ratio of Sm: Ba: Cu: Bi = 2: 4: 1: 1, Sm 2 o 3 、BaCO 3 , CuO and Bi 2 o 3 The powders were mixed to obtain the Sm2411 phase powder.

[0034] 2. After fully grinding the Sm123 phase powder, Sm211 phase powder, Sm242 phase powder and Sm2411 phase powder obtained in step 1, respectively, put the Sm123 phase powder, Sm211 phase powder and Sm2411 phase powder in the air atmosphere In the process of sintering for 48h, the corresponding sintering temperatures are 900°C, 900°C and 950°C respectively; 2 In the atmosphere, sintering for 24h, the sintering temperature is 850 ℃. The sintered powder was ground and sintered again, and repeated three times to obtain Sm123 pure-phase powder, Sm211 pure-phase...

Embodiment 2

[0044] 1. According to the ratio of Sm:Ba:Cu=1:2:3 and Sm:Ba:Cu=2:1:1, Sm 2 o 3 、BaCO 3 Mix with CuO powder to obtain Sm123 phase and Sm211 phase powder, according to the ratio of Sm:Ba:Cu=2:4:2, Sm 2 o 3 、BaO 2 Mix with CuO powder to obtain Sm242 phase powder, according to the ratio of Sm: Ba: Cu: Bi = 2: 4: 1: 1, Sm 2 o 3 、BaCO 3 , CuO and Bi 2 o 3 The powders were mixed to obtain the Sm2411 phase powder.

[0045] 2. After fully grinding the Sm123 phase powder, Sm211 phase powder, Sm242 phase powder and Sm2411 phase powder obtained in step 1, respectively, put the Sm123 phase powder, Sm211 phase powder and Sm2411 phase powder in the air atmosphere In the process of sintering for 48h, the corresponding sintering temperatures are 900°C, 900°C and 950°C respectively; 2 In the atmosphere, sintering for 24h, the sintering temperature is 850 ℃. The sintered powder was ground and sintered again, and repeated three times to obtain Sm123 pure-phase powder, Sm211 pure-phase...

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Abstract

The invention discloses a method for quickly growing an REBCO high-temperature superconducting block by stepped slow cooling acceleration, by using a c-axis-oriented NdBCO / YBCO / MgO film as a seed crystal, contacting the ab surface of the film seed crystal with the upper surface of a precursor block, putting the precursor block and the film seed crystal in a growth furnace, and carrying out melt structure growth. The temperature procedure of the growth furnace is as follows: heating from room temperature to 960 DEG C within 5 hours, and keeping the temperature for 3 hours; continuing heating to the maximum temperature Tmax, and keeping the temperature for 1-2 hours; cooling to the initial growth temperature Ts within 15 minutes; and growing the REBCO high-temperature superconducting block according to the stepped slow cooling acceleration growth procedure. The method disclosed by the invention can not generate spontaneous nucleation and second-phase enrichment on the premise of ensuring the induced growth of the seed crystal; and the gradually increasing cooling rate ensures the increasing driving force required by growth.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature superconducting material, in particular to a method for rapidly growing a REBCO high-temperature superconducting block with step-type accelerated slow cooling. Background technique [0002] Since REBa 2 Cu 3 o x (referred to as REBCO, RE123, rare earth barium copper oxide) superconductors have attracted widespread attention since they were discovered. Due to its complete diamagnetism, high critical current density, and high freezing magnetic field, REBCO 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 bu...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B11/00
Inventor 姚忻彭波南程玲庄宇峰许恒恒郭林山王伟
Owner SHANGHAI JIAO TONG UNIV
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