Superconducting joining of melt-textured Y–Ba–Cu–O bulk material

Prikhna, T. A.; Gawalek, W.; Moshchil, Viktor; Surzhenko, A. B.; Kordyuk, A. A.; Litzkendorf, D.; Дуб, С. Н.; Mel'nikov, V.L.; Plyushchay, A.I.; Sergienko, Nina; Kоval, A. Yu.; Bokoch, S. M.; Habisreuther, T.

doi:10.1016/s0921-4534(01)00049-1

Cited by 25 publications

(27 citation statements)

References 4 publications

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“…Usually the structure of MT-YBCO (top-seed grown, for example) [17] is constituted from quasi single--crystalline or textured superconducting Y123 matrix growing in the whole volume of the sample with fine--dispersed inclusions of nonsuperconductive, the so-called "green", Y 2 BaCuO 5 (Y211) phase. It is considered that the presence of dispersed inclusions of the Y211 phase in the superconductive structure improves the pinning due to the formation of high density of dislocations and stacking faults around Y211 grains [18].…”

Section: Nanostructural Superconducting Materials For Fault Currentmentioning

confidence: 99%

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

et al. 2010

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Materials of the Y-Ba-Cu-O (melt-textured YBa2Cu3O 7−δ -based materials or MT-YBCO) and Mg-B-O (MgB2-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogeneities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800• C) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of MgB2-based materials allowed us to attain high superconductive (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 µm −1 ), prevention of macrocracking and reduction (by a factor of 4.5) of microcrack density, and in the case of MgB2-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogeneities as well as inclusions of higher borides with near-MgB12 stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high Tc (37 K) and critical current densities in materials with MgB12 matrix (with 95% of shielding fraction as calculated from the resistant curve).

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Section: Nanostructural Superconducting Materials For Fault Currentmentioning

confidence: 99%

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

et al. 2010

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“…A brief description of the approach is given in section 4.2 (for more details see [20]). Another approach [21,22] has been developed to estimate the quality of superconducting joints (welds) between blocks of HTS bulks [23] and evaluate the joint's critical current density.…”

Section: Levitation Force Measurementsmentioning

confidence: 99%

Magnetic Flux Dynamics in HTS Bulks with Levitation Techniques

et al. 2002

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The discovery of high-temperature superconductors (HTS) has led to understanding that, in order to explain and utilize the phenomenon, completely new physical approaches should be introduced at all scales: microscopic, mesoscopic, macroscopic. Leaving first two scales beyond the scope of the present paper, we focus in the upper limit of the last scale, the study of the magnetic flux dynamics in HTS bulks-the dynamics of the 'compact vortex structures'. A new direction in the experimental superconducting physics, the investigation of HTS bulks with levitation techniques, which has been elaborated during last years to effectively explore the subject, as well as the new fundamental and applied results obtained there from are overviewed here.Відкриття високотемпературних надпровідників (ВТНП) призвело до розуміння то-го, що задля пояснення та використання цього явища на всіх рівнях: мікроскопічно-му, мезоскопічному та макроскопічному, має бути створено принципово нові фізичні підходи. Полишаючи перші два рівні поза увагою даної роботи, ми детально розгля-даємо верхню границю останнього -дослідження динаміки магнітного потоку в масивних ВТНП, динаміки «компактових вихорових структур». Дана робота -це огляд нового напрямку експериментальної фізики надпровідників -дослідження масивних ВТНП левітаційними методами -що його було вироблено останнім часом для вивчення зазначеної проблеми, а також тих нових фундаментальних та практич-них результатів, що було тут отримано.Открытие высокотемпературных сверхпроводников (ВТСП) привело к пониманию того, что для объяснения и использования этого явления необходимо создание принципиально новых физических подходов на всех уровнях: микроскопическом, мезоскопическом, макроскопическом. Оставляя первые два уровня за рамками данной работы, мы сфокусировали внимание на верхнем пределе последнего -исследовании динамики магнитного потока в массивных ВТСП, динамики «ком-пактных вихревых структур». Данная работа -это обзор нового направления экс-периментальной физики сверхпроводников, которое было выработано за послед- Fiz. Met. 2002, т. 3, сс. 357-386 Оттиски доступны непосредственно от издателя Фотокопирование разрешено только в соответствии с лицензией 2002 ИМФ (Институт металлофизики им. Г. В. Курдюмова НАН Украины) Напечатано в Украине. 358A. A. Kordyuk, V. V. Nemoshkalenko , A. I. Plyushchay, and R. V. Viznichenko ние годы, а также тех новых фундаментальных и прикладных результатов, которые были здесь получены.

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“…For this reason, a worldwide interest to the ringlike geometry was fading away until an idea to weld 6 MT blocks gained a respectable reputation. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] Briefly, the joining procedures consist in the welding of single MT domains during a liquid-assisted process which either releases residual BaCuO oxide trapped in the MT material 8 or uses the corresponding REBCO ͓REϭTm ͑Refs. 9-11͒, Yb ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, these measurements are restricted both by the surface S of the weld and by its quality j w which, in turn, imposes the lowest-temperature margin. On the other hand, prevalent contactless methods ͑e.g., levitation force technique, 9,19 magneto-optical image analysis, 9,17,22 scanning Hall-sensor magnetometry, [8][9][10][11][12][13][14][15] and magnetization loop studies 8,9,18,23 ͒ are not free of ambiguities in the processing of experimental data unless, as mentioned above, the welded sample has the shape of a thin ring. In this case, the circular current throughout a ring is limited by the weakest link which is, in turn, usually associated with a joint.…”

Section: Introductionmentioning

confidence: 99%

“…The last, but not the least, argument is a widespread use of the scanning Hall-sensor systems. [8][9][10][11][12][13][14][15] For this technique to give reliable results, the experimental data have to be properly processed. Meanwhile, most of the authors prefer to simplify the genuine distribution of cur-rents and to consider their rings as homogeneous ͑one-turn͒ solenoids carrying the transport current I w .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Intergrain and intragrain currents in bulk melt-grownYBa2Cu3O7

Surzhenko¹,

Zeisberger²,

Habisreuther³

et al. 2003

Phys. Rev. B

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A simple contactless method suitable for discerning between the intergrain ͑circular͒ current, which flows in the thin superconducting ring, and the intragrain current, which does not cross the weakest link, has been proposed. At first, we show that the intergrain current may directly be estimated from the magnetic flux density B(Ϯz 0 ) measured by the Hall sensor positioned in the special points Ϯz 0 above or below the ring center. The experimental and numerical techniques to determine the value z 0 are discussed. Being very promising for the characterization of a current flowing across the joints in welded YBaCuO rings ͑its dependences on the temperature and external magnetic field as well as the time dissipation͒, the approach has been applied to study the corresponding properties of the intragrain and intergrain currents flowing across the a-twisted grain boundaries which are frequent in bulk melt-textured ͑MT͒ YBaCuO samples. We present experimental data related to the flux penetration inside a bore of MT YBaCuO rings both in the nonmagnetized, virgin state, and during the field reversal. The shielding properties and their dependence on external magnetic fields are also studied. Besides, we consider flux creep effects and their influence on the current redistribution during a dwell.

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Superconducting joining of melt-textured Y–Ba–Cu–O bulk material

Abstract: The Tm-Ba-Cu-O solder can be successfully used to produce a superconductive joint between MT-YBCO parts. The peculiarities of solidification, phase formation, structure transformations and electromagnetic properties of MT-YBCO soldered with Tm Ba 2 Cu 3 O 7-/ are discussed.

Cited by 25 publications

References 4 publications

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines

Magnetic Flux Dynamics in HTS Bulks with Levitation Techniques

Intergrain and intragrain currents in bulk melt-grownYBa2Cu3O7

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