Method for preparing large size yttrium system block material by Ag2O adding YBCO solder brazing
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A brazing material and brazing technology, which is applied in the field of superconducting block material preparation, can solve the problems of slow crystal growth
Inactive Publication Date: 2012-07-25
TSINGHUA UNIV +1
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It is usually prepared by the top seed melt texture growth method. Due to the limitation of the characteristics of crystal growth (very slow, only millimeters or even less per hour), when producing large-sized and complex-shaped YBCO blocks, it is encountered. great difficulty
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Embodiment 1
[0019] Use to add Ag 2 O’s YBCO solder brazing method to prepare large-scale yttrium-based bulk materials, using the top seed crystal melt texture growth method to prepare the addition of Ag 2 The YBCO brazing material of 0 adopts the brazing connection process to weld the YBCO bulk material, and the method steps are as follows,
[0020] (1) Prepare and add Ag 2 O's YBCO solder:
[0021] ① Prepare Y-123 phase and Y-211 phase respectively by chemical synthesis method, Y-123 phase is YBa 2 Cu 3 Ox, the synthesis method is Y 2 o 3 、BaCO 3 , CuO mixed uniformly according to the nominal ratio, then sintered at 920°C for 48 hours, mixed again, and then sintered at 920°C for 48 hours; Y-211 phase is Y 2 BaCuO 5 , the synthesis method is Y 2 o 3 、BaCO 3 , CuO is mixed evenly according to the nominal ratio, then sintered at 930°C for 48 hours, mixed again, and then sintered at 930°C for 48 hours;
[0022] ②According to the weight ratio Y-123: 69.75%, Y-211: 20%, Ag 2 O: 10...
Embodiment 2
[0031] Use to add Ag 2 O’s YBCO solder brazing method to prepare large-scale yttrium-based bulk materials, using the top seed crystal melt texture growth method to prepare the addition of Ag 2 The YBCO brazing material of 0 adopts the brazing connection process to weld the YBCO bulk material, and the method steps are as follows,
[0032] (1) Prepare and add Ag2 O's YBCO solder:
[0033] ① Prepare Y-123 phase and Y-211 phase respectively by chemical synthesis method, Y-123 phase is YBa 2 Cu 3 Ox, the synthesis method is Y 2 o 3 、BaCO 3 , CuO mixed uniformly according to the nominal ratio, then sintered at 920°C for 48 hours, mixed again, and then sintered at 920°C for 48 hours; Y-211 phase is Y 2 BaCuO 5 , the synthesis method is Y 2 o 3 、BaCO 3 , CuO is mixed evenly according to the nominal ratio, then sintered at 930°C for 48 hours, mixed again, and then sintered at 930°C for 48 hours;
[0034] ②According to the weight ratio Y-123 phase: 49.5%, Y-211 phase: 30%, Ag...
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Abstract
The invention discloses a method for preparing large-size yttrium-system block materials by using an Ag2O-added YBCO solder braze welding method, and belongs to the technical field of superconductive block material preparation. The method is to adopt a top-seeded melt-textured growth method to prepare Ag2O-added YBCO solder, adopt braze welding connecting technology to weld YBCO block materials, perform post-oxidation treatment on braze welding joints, restore the superconductivity of a YBCO braze welding sample, and obtain yttrium barium copper oxygen superconductive block materials. The invention adopts the braze welding method to prepare the YBCO superconductive block materials which have large size and complex shape and cannot be prepared by the prior method, and the YBCO superconductive block materials have similar superconductivity with single-domain block materials prepared by the top-seeded melt-textured growth method. Because developed solder compositions are similar to the chemical compositions of the prior base metal, the texture of soldering seams is similar to that of the base metal. The superconductivity of the YBCO high-temperature superconductive block materials prepared by the method can reach more than 60 percent of the prior block material.
Description
technical field [0001] The invention belongs to the technical field of preparation of superconducting block materials, in particular to the use of adding Ag 2 O's YBCO solder brazing method for preparing large-scale yttrium-based bulk materials. Background technique [0002] Yttrium barium copper oxide YBCO (YBaCuO) superconducting bulk material is an oxide ceramic material that generates a c-axis preferred orientation crystal structure through a peritectic reaction. It is a high-temperature superconductor with strong magnetic flux pinning and high critical current density. It is usually prepared by the top seed melt texture growth method. Due to the limitation of the characteristics of crystal growth (very slow, only millimeters or even less per hour), when producing large-sized and complex-shaped YBCO blocks, it is encountered. great difficulty. Therefore, there is an urgent need for an efficient connection technology to increase the size of single-domain YBCO bulk or to...
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