Joining of melt-textured YBCO using Tm123 powder as a solder

Prikhna, T. A.; Gawalek, W.; Moshchil, Viktor; Sergienko, Nina; Sverdun, V. B.; Surzhenko, A. B.; Wendt, M. R.; Litzkendorf, D.; Habisreuther, T.; Vlasenko, Andrey

doi:10.1016/s0921-4534(02)02124-x

Cited by 11 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Single-domain rings were machined from MT-YBCO superconducting blocks as illustrated in figure 2(a). Then a ring was placed inside the Oxford Instrument 3001 vibrating sample magnetometer (VSM) and j c estimated from the resulting magnetization loop using the equation j c = 3m/H π(R 3 2 − R 3 1 ), where m is the magnetic moment, R 1 and R 2 are the inner and outer radii of the ring, respectively, and H is the ring height (see curves 1 in figure 4). After this the ring was cut (figure 2(b)) by a diamond wheel into two parts along its diameter.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Formation of superconducting junctions in MT-YBCO

Prikhna¹,

Gawalek²,

Новиков³

et al. 2004

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The formation of superconducting junctions between MT-YBCO using TmBa 2 Cu 3 O 7−δ powder as a solder has been studied. The method proposed excludes the step of a very slow cooling (at a rate of several degrees per hour) during seam formation. The heating and cooling rate for joining parts produced from single-domain material without visible cracks (macrocracks) can be rather high (500-1000 K h −1) and a holding time at the highest temperature (1010 • C) of several minutes (0.05 h) is enough to form a reliable junction. Reasonable rates of heating and cooling are however around 100 K h −1 if crack propagation is to be avoided in joined blocks used for practical application. Modelling experiments on rings and studies of the ring properties by vibrating sample magnetometer (VSM), field mapping with a Hall probe and magneto-optical microscopy have shown that superconducting properties of the junction were not lower than that of the joined material (j c of about 30 kA cm −2 was observed in zero field at 77 K) and that the proposed process of joining did not adversely affect the properties of the material. The structure of the resulting junction was in good agreement with the structure of MT-YBCO.

show abstract

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Formation of superconducting junctions in MT-YBCO

Prikhna¹,

Gawalek²,

Новиков³

et al. 2004

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…It was cut parallel to the c-axis into two pieces of . These pieces were rejoined using as welding agent [13]. After covering the surfaces with Tm123 powder the pieces were placed on top of each other in the furnace.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The performance of this material depends on the critical current density and the maximum diameter of the current loops. The top-seeded melt-texture process [3], which is now the most common preparation technology, allows for single grain YBCO blocks with a diameter of 2-4 cm and a critical current density of [10][11][12][13][14][15][16][17][18][19][20] . Higher -values can be obtained with some other REBCO (RE: e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic characterization of welded YBaCuO-bulk samples

Zeisberger

Habisreuther

Litzkendorf

et al. 2005

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

The welding of individually grown pieces of high temperature superconductor bulk material is the most promising way to obtain larger single domain tiles which are required for cryomagnetic applications. In this paper we present a method for the characterization of this kind of material. The method is based on the inductive measurement of the total current in ring samples using a Rogowski coil and an integrator circuit. The advantage of this technique is that it allows a direct measurement of the current crossing the artificial grain boundary without being influenced by the intergrain current and is independent of the sample size and geometry. We present the principle of the measurement and the calibrations of the system. The independence of the output signal on intragrain currents is demonstrated. The application of the method for the characterization of a welded sample is shown.

show abstract

“…A 3rd, more widely investigated, set of techniques uses a weld material between the YBCO bulk single grain sections to be joined. The weld material necessarily has a lower peritectic temperature than YBCO, so is typically thulium [21][22][23][24][25][26], ytterbium [27][28][29][30] or erbium-based [30][31][32] (RE)BCO or YBCO-Ag [33][34][35][36][37]. On heating, the weld material melts while the majority of the single grain remains solid.…”

Section: Introductionmentioning

confidence: 99%

A reliable technique to fabricate superconducting joints between single grain, Y–Ba–Cu–O bulk superconductors

Congreve

Dennis

Shi

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The production of large (RE)Ba-Cu-O single grains ((RE) BCO), where RE = Y, Gd or Sm, of complex geometries is presently limited by the intrinsic slowness of the grain growth process. Additionally, the shapes achievable using established melt processing are constrained by the small number of post-processing techniques available. These materials are brittle and hard, which makes machining a difficult task and largely eliminates the possibility of producing highly intricate shapes. An alternative to this slow and inflexible growth process would be to join many small single grains to form one large composite grain, connected by high-performance superconducting joints. A reliable joining technique would also overcome the need for the careful and time-consuming post-growth machining processes. In this work we report on the use of single grain YBCO-Ag as an interface medium to achieve superconducting joints between (RE)BCO bulks. This joining technique is relatively quick and does not require tight process parameter control as there is no need to re-grow the interface joining material. We report on six joints produced from samples cut and joined in a variety of orientations. In addition, a joint was produced using bulk YBCO from two independent single grains. The trapped field properties of the resulting joined sample were measured and the microstructure at the joint was examined. We show that this simple but effective joining technique makes it possible to produce multiple composite grains with comparable superconducting properties to those of a single grain of the same size.

show abstract

Joining of melt-textured YBCO using Tm123 powder as a solder

Cited by 11 publications

References 3 publications

Formation of superconducting junctions in MT-YBCO

Formation of superconducting junctions in MT-YBCO

Magnetic characterization of welded YBaCuO-bulk samples

A reliable technique to fabricate superconducting joints between single grain, Y–Ba–Cu–O bulk superconductors

Contact Info

Product

Resources

About