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Method for preparing large size yttrium system block material with YbBCO as solder by brazing method
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A large-size, brazing material technology, which is applied in the field of superconducting bulk material preparation, can solve the problems of slow crystal growth and other problems
Inactive Publication Date: 2009-08-05
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
[0020] The method of preparing large-size yttrium-based blocks by adding YbBCO solder with texture characteristics by brazing method, using the top seed melt texture growth method to prepare YbBCO solder with texture characteristics, and using the brazing connection process to YBCO Block material is welded, and the method steps are as follows:
[0021] (1) Preparation of YbBCO solder with texture characteristics:
[0022] ① Prepare Yb-123 phase and Yb-211 phase by chemical synthesis method, Yb-123 phase is YbBa 2 Cu 3 o x , the synthetic method is Yb 2 o 3 、BaCO 3 , CuO mixed uniformly according to the nominal ratio, then sintered at 880°C for 48 hours, mixed again, and then sintered at 880°C for 48 hours; Yb-211 phase is Yb 2 BaCuO 5 , the synthetic method is Yb 2 o 3 、BaCO 3 , CuO is mixed evenly according to the nominal ratio, then sintered at 900°C for 48 hours, mixed again, and then sintered at 900°C for 48 hours;
[0023] ②According to the weight ratio Yb-123:...
Embodiment 2
[0032] The method of preparing large-size yttrium-based blocks by adding YbBCO solder with texture characteristics by brazing method, using the top seed melt texture growth method to prepare YbBCO solder with texture characteristics, and using the brazing connection process to YBCO Block material is welded, and the method steps are as follows:
[0033] (1) Preparation of YbBCO solder with texture characteristics:
[0034] ① Prepare Yb-123 phase and Yb-211 phase by chemical synthesis method, Yb-123 phase is YbBa 2 Cu 3 o x , the synthetic method is Yb 2 o 3 、BaCO 3 , CuO mixed uniformly according to the nominal ratio, then sintered at 880°C for 48 hours, mixed again, and then sintered at 880°C for 48 hours; Yb-211 phase is Yb 2 BaCuO 5 , the synthetic method is Yb 2 o3 、BaCO 3 , CuO is mixed evenly according to the nominal ratio, then sintered at 900°C for 48 hours, mixed again, and then sintered at 900°C for 48 hours;
[0035] ②According to the weight ratio Yb-123: 8...
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Abstract
The invention discloses a method of preparing large-size yttrium-system bulk by using YbBCO as filler metal by a braze welding method, which belongs to the technical field of superconduct bulk preparation. The method adopts a top seed crystal melting texture growth method for preparation by adding YbBCO filler metal, adopts a braze welding connecting technology to weld YbBCO bulk, carry out post-oxidation treatment of braze welding joints and recover the superconductivity of YbBCO and a joint section thereof to obtain the large-size yttriumbariumcopperoxide superconduct bulk. The YbBCO superconduct bulk with large size and complicated shape, which cannot be prepared by the traditional method, can be prepared by the method and has the superconductivity similar to that of single-domain bulk prepared by a top seed crystal melting texture method. The superconductivity of the high-temperature YbBCO superconduct bulk prepared by the invention can reach more than 70 percent of that of original bulk.
Description
technical field [0001] The invention belongs to the technical field of superconducting block material preparation, and in particular relates to a method for preparing large-size yttrium-based block material by using YbBCO as a brazingfiller metal. Background technique [0002] Yttriumbariumcopperoxide YBCO (YBaCuO) superconducting bulk material is an oxideceramic 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 ...
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