Low temperature melt process of SmBa2Cu3O7−y using a liquid infiltration technique

Kim, Chan-Joong; Jee, Young A.; Lee, Kyu-Won; Sung, Tae–Hyun; Han, Sang-Chul; Kuk, Il-Hyun; Hong, Guang

doi:10.1016/s0964-1807(98)00095-7

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…Compared with conventional melt texture growth (MTG) processes [1][2][3][4]; the liquid infiltration growth (LIG) process [5][6][7][8][9][10][11][12] has two advantages: effective Y 2 BaCuO 5 (Y211) refinement [5][6][7][8][9][10][11][12] and suppression of large spherical pores [5,[9][10][11][12]. The Y211 refinement in the LIG process might be attributed to the relatively short holding time at high temperature, while suppressed pore formation is attributed to reduced oxygen evolution during melting, which is caused by the use of a liquid forming Y035 powder.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y₂BaCuO₅powder

Mahmood

Chu

Sung

2012

Supercond. Sci. Technol.

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The size effects of a precursor Y 2 BaCuO 5 (Y211) powder on the microstructure and critical current density (J c ) of liquid infiltration growth (LIG)-processed YBa 2 Cu 3 O 7−y (Y123) bulk superconductors were investigated in terms of milling time (t). Y211 powders were attrition-milled for 0-10 h in 2 h increments at a fixed rotation speed of 400 rpm. Y211 pre-forms were made by pelletizing the milled Y211 powders followed by subsequent sintering, after which an LIG process with top seeding was applied to the Y211/Ba 3 Cu 5 O 8 (Y035) pre-forms. Spherical pores were observed in all LIG-processed Y123 samples and the pore density gradually decreased as t increased from 0 to 8 h. In addition to the reduced pore density, the Y211 particle size in the final Y123 products also decreased with increasing t. As t increased further to 10 h, unexpected Y211 coarsening and large pore evolutions were observed. The magnetic susceptibility-temperature curves showed that the onset superconducting transition temperature (T c,onset ) of all samples was the same (91.5 K), but the transition width became greater as t increased. The J c of the Y123 bulk superconductors fabricated in this study was observed to correlate well with t of the Y211 precursor powder. The maximum J c of 1.0 × 10 5 A cm −2 (at 77 K, 0 T) was achieved at t = 8 h, which is attributed to the reduction in pore density and Y211 particle size. The prolonged milling time of t = 10 h decreased the J c of the LIG-processed Y123 superconductor owing to the evolution of large pores and exaggerated Y211 growth.

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Section: Introductionmentioning

confidence: 99%

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y₂BaCuO₅powder

Mahmood

Chu

Sung

2012

Supercond. Sci. Technol.

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“…The conventional melt processing of REBa 2 Cu 3 O y involves shrinkage 5 of the preform up to 25% due to the liquid‐phase outflow, resulting in distortions and macrodefects. Like directed metal oxidation (DIMOX) or pressureless metal infiltration (PRIMEX), 6,7 which have been commonly used as near‐net shape ceramic‐processing techniques, where the molten liquid alloy is allowed to infiltrate into the porous preform, several works 8–14 have been reported for bulk REBa 2 Cu 3 O y using a similar infiltration‐growth process. This technique is compatible with processing the material into near‐net shapes free of porosity and at the same time yields highly textured material as a single domain.…”

Section: Introductionmentioning

confidence: 99%

Infiltration and Top Seed Growth‐Textured YBCO Bulks With Multiple Holes

Noudem

Meslin

Horvath

et al. 2007

Journal of the American Ceramic Society

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The recently reported hole‐patterned YBa2Cu3Oy (Y123) bulks with improved superconducting properties are highly interesting from material quality and application variety points of view. It is well known that the core of plain bulk superconductors needs to be fully oxygenated and some defects like cracks, pores, and voids must be suppressed in order that the material can trap a high magnetic field or carry a high current density. To minimize the above defects, we have used a combination of standard superconducting ceramic processing and an infiltration technique to prepare regularly perforated YBa2Cu3Oy (Y123) bulk superconductors. This process leads to negligible shrinkage upon annealing and a uniform distribution of Y211 inclusions. Texture was evidenced by neutron pole figure measurements. Flux mapping was used to verify the superconducting homogeneity of the samples and to investigate the field‐trapping ability. In addition, the textured drilled samples were reinforced using resin or metal impregnation and the influence of the different processing steps on the hardness of the materials has been investigated.

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“…In addition, the TSMG process often results in the formation of single grains that contain voids, pores and macroscopic distortions of the bulk, green microstructure. In order to address these problems, a new technique based on infiltration and growth (IG) has been developed by various laboratories in recent years [6][7][8][9][10][11][12][13][14]. An important feature of the IG process is that it offers the flexibility of producing large samples of near-net shape without distortion or microcracks.…”

Section: Introductionmentioning

confidence: 99%

The effect of Y-211 precursor particle size on the microstructure and properties of Y–Ba–Cu–O bulk superconductors fabricated by seeded infiltration and growth

Meslin

Iida

Babu

et al. 2006

Supercond. Sci. Technol.

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Large, single grains of Y-Ba-Cu-O (YBCO) bulk superconductor composed of a YBa 2 Cu 3 O 7−δ (Y-123) matrix with Y 2 BaCuO 5 (Y-211) inclusions have been fabricated using a seeded infiltration and growth (IG) process. Y-211 precursor pellets prepared from powders containing different Y-211 particle sizes were processed by the seeded IG technique to investigate the effect of Y-211 size on the single grain microstructure. The superconducting properties of the single grains fabricated in this study are observed to correlate well with the variation in Y-211 particle size in the fully textured Y-123 phase matrix. The critical current density, J c , in particular, has been observed to increase from 68 000 A cm −2 for a reference sample to 94 000 A cm −2 at 77 K in self-field for a sample prepared using refined Y-211 precursor powder with added platinum oxide.

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Low temperature melt process of SmBa2Cu3O7−y using a liquid infiltration technique

Cited by 9 publications

References 21 publications

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y₂BaCuO₅powder

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y₂BaCuO₅powder

Infiltration and Top Seed Growth‐Textured YBCO Bulks With Multiple Holes

The effect of Y-211 precursor particle size on the microstructure and properties of Y–Ba–Cu–O bulk superconductors fabricated by seeded infiltration and growth

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Low temperature melt process of SmBa2Cu3O7−y using a liquid infiltration technique

Cited by 9 publications

References 21 publications

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y2BaCuO5powder

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y2BaCuO5powder

Infiltration and Top Seed Growth‐Textured YBCO Bulks With Multiple Holes

The effect of Y-211 precursor particle size on the microstructure and properties of Y–Ba–Cu–O bulk superconductors fabricated by seeded infiltration and growth

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Product

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Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y₂BaCuO₅powder

Enhancement of critical current density of liquid-infiltration-processed Y–Ba–Cu–O bulk superconductors using milled Y₂BaCuO₅powder