YBCO高温超导带材熔融行为研究
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摘要
对于第二代高温超导带材,超导接头的实现与超导层的直接熔融互连有关。为了研究YBa_2Cu_3O_(7-x)(YBCO)高温超导带材在热处理时的熔融行为,在真空下对一段梯形的YBCO带材通电使其形成不同的温区,通过不同的测试手段研究薄膜经过热处理后成分、结构以及超导性能的变化。结果表明YBCO超导层在经过一个合适的温度和4 h的氧气退火处理后,能够恢复或部分恢复其超导性能。经分析认为此过程中超导薄膜能够恢复超导性能的原因是Y123相没有分解。但是,如果热处理温度过高会导致Y123相分解为Y211相和钡铜氧化物,这种相变会导致超导性能无法恢复。
For the second-generation high temperature superconducting tape,the realization of superconducting joint is related to the direct melting connection of the superconducting layer.In order to study the melting behavior of YBa_2Cu_3O_(7-x) high-temperature superconducting tape,a heating current was introduced into a trapezoidal YBCO tape under vacuum to obtain different temperature zones.The composition,structure and superconducting properties of the film were studied with different test methods.The results show that the superconducting performance of YBCO films can recover or partially recover after the treatment of a suitable heating current and 4 h oxygen annealing.The reason for the recovery of superconducting performance is probably that Y123 crystal does not decompose in this process.However,if the heating temperature is too high,Y123 superconducting phase will decompose into Y211 phase and barium copper oxide,which may lead to the deterioration of superconducting properties.
For the second-generation high temperature superconducting tape,the realization of superconducting joint is related to the direct melting connection of the superconducting layer.In order to study the melting behavior of YBa_2Cu_3O_(7-x) high-temperature superconducting tape,a heating current was introduced into a trapezoidal YBCO tape under vacuum to obtain different temperature zones.The composition,structure and superconducting properties of the film were studied with different test methods.The results show that the superconducting performance of YBCO films can recover or partially recover after the treatment of a suitable heating current and 4 h oxygen annealing.The reason for the recovery of superconducting performance is probably that Y123 crystal does not decompose in this process.However,if the heating temperature is too high,Y123 superconducting phase will decompose into Y211 phase and barium copper oxide,which may lead to the deterioration of superconducting properties.
引文
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[19]Zheng H,Jiang M,Nikolova R,et al.High critical current “weld” joints in textured YBa2Cu3Ox [J].Physica C,1999,322(1/2):1-8.
[20]Mukhopadhyay S M,Mahadev N,Sengupta S.Microstructural and spectroscopic analyses of a strongly-linked joint formed in a superconductor [J].Physica C,2000,329(2):95-101.
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[22]Harnois C,Chaud X,Laffez I,et al.Joining of YBCO textured domains:a comparison between the multi-seeding and the welding techniques [J].Physica C,2002,372/373/374/375/376:1103-1106.
[23]Noudem J G,Reddy E S,Goodilin E A,et al.Microstructure and transport properties of melt-textured joint of YBCO [J].Physica C,2002,372/373/374/375/376:1187-1190.
[24]Li S,Li W,Li G,et al.Morphology and superconducting properties of photo-assisted MOCVD processed YBCO film by variation of sublimation temperature of the Cu-based precursor [J].Physica C,2012,478:60-66.
[25]Kim G,Jin H J,Jo W,et al.Ultra-large current transport in thick SmBa2Cu3O7-x films grown by reactive co-evaporation[J].Physica C,2015,513:29-34.
[26]Matias V,Rowley E J,Coulter Y,et al.YBCO films grown by reactive co-evaporation on simplified IBAD-MgO coated conductor templates [J].Superconductor Science and Technology,2009,23(1):014018.
[27]Zhang F,Zhao R,Xue Y,et al.Self-heating technique of metallic substrate for reel-to-reel and double-sided deposition of YBa2Cu3O7-δ films [J].Applied Physics A,2016,122(2):81.
[2]Larbalestier D,Gurevich A,Feldmann D M,et al.High-TC superconducting materials for electric power applications [J].Nature,2001,414(6861):368-377.
[3]Hull J R.Applications of high-temperature superconductors in power technology [J].Reports on Progress in Physics,2003,66(11):1865.
[4]Zannella S.Power applications of high temperature superconductors [C]// Superconducting Materials:Advances in Technology and Applications.New Jerse,USA:WSPC,2000:323-330.
[5]Iliescu S,Granados X,Bartolomé E,et al.High critical current YBa2Cu3O7 artificial joints using Ag foils as welding agent [J].Superconductor Science and Technology,2003,17(1):182-185.
[6]Kato J Y,Sakai N,Tajima S.Diffusion joint of YBCO coated conductors using stabilizing silver layers [J].Physica C,2006,445/446/447/448:686-688.
[7]Salama K,Selvamanickam V.Joining of high current bulk Y-Ba-Cu-O superconductors [J].Applied Physics Letters,1992,60(7):898.
[8]Sheahen T P.Introduction to high-temperature superconductivity [M].New York:Plenum Press,1994:3-13.
[9]Konstantopoulou K,Sarazin M,Granados X,et al.Effect of the axial stress and the magnetic field on the critical current and the electric resistance of the joints between HTS coated conductors [J].Superconductor Science and Technology,2015,28(6):1-12.
[10]Shin H S,Kim J M.Parametric study for low-resistance joint of REBCO coated conductor tapes using ultrasonic welding [J].IEEE Transactions on Applied Superconductivity,2016,26(3):1-5.
[11]Kato-Yoshioka J,Sakai N,Tajima S,et al.Low resistance joint of the YBCO coated conductor[J].Journal of Physics:Conference Series,2006,43(1):166.
[12]Park D K,Ahn M C,Kim H M,et al.Analysis of a joint method between superconducting YBCO coated conductors [J].IEEE Transactions on Applied Superconductivity,2007,17(2):3266-3269.
[13]Tsukui S,Adachi M,Oshima R,et al.Oxygen tracer diffusion in the YBa2Cu3Oy superconductor [J].Physica C,2001,351(4):357-362.
[14]Park Y,Shin H J,Kim Y G,et al.Effects of melting diffusion and annealing in oxygen on superconducting characteristics of GdBCO coated conductors:preliminary results [J].IEEE Transactions on Applied Superconductivity,2013,23(3):6600804.
[15]Kim H S,Song J B,Kwon N Y,et al.The influence of heat-treatment and oxygenation annealing on the superconducting properties of YBCO coated conductors [J].Superconductor Science and Technology,2009,22(12):125016.
[16]Park Y,Lee M,Ann H,et al.A superconducting joint for GdBa2Cu3O7-δ coated conductors[J].NPG Asia Materials,2014,6(5):e98.
[17]Park Y J,Lee M W,Oh Y K,et al.Laser drilling:enhancing superconducting joint of GdBa2Cu3O7-δ coated conductors [J].Superconductor Science and Technology,2014,27(8):085008.
[18]张涵,马光同,李兴田,等.高温超导涂层带材接头工艺研究进展 [J].低温与超导,2016(4):43-54.
[19]Zheng H,Jiang M,Nikolova R,et al.High critical current “weld” joints in textured YBa2Cu3Ox [J].Physica C,1999,322(1/2):1-8.
[20]Mukhopadhyay S M,Mahadev N,Sengupta S.Microstructural and spectroscopic analyses of a strongly-linked joint formed in a superconductor [J].Physica C,2000,329(2):95-101.
[21]Harnois C,Desgardin G,Chaud X.A new way of welding YBa2Cu3O7-δ bulk textured domains [J].Superconductor Science and Technology,2001,14(9):708.
[22]Harnois C,Chaud X,Laffez I,et al.Joining of YBCO textured domains:a comparison between the multi-seeding and the welding techniques [J].Physica C,2002,372/373/374/375/376:1103-1106.
[23]Noudem J G,Reddy E S,Goodilin E A,et al.Microstructure and transport properties of melt-textured joint of YBCO [J].Physica C,2002,372/373/374/375/376:1187-1190.
[24]Li S,Li W,Li G,et al.Morphology and superconducting properties of photo-assisted MOCVD processed YBCO film by variation of sublimation temperature of the Cu-based precursor [J].Physica C,2012,478:60-66.
[25]Kim G,Jin H J,Jo W,et al.Ultra-large current transport in thick SmBa2Cu3O7-x films grown by reactive co-evaporation[J].Physica C,2015,513:29-34.
[26]Matias V,Rowley E J,Coulter Y,et al.YBCO films grown by reactive co-evaporation on simplified IBAD-MgO coated conductor templates [J].Superconductor Science and Technology,2009,23(1):014018.
[27]Zhang F,Zhao R,Xue Y,et al.Self-heating technique of metallic substrate for reel-to-reel and double-sided deposition of YBa2Cu3O7-δ films [J].Applied Physics A,2016,122(2):81.