An Improvement of the Static and Dynamic Characteristics of Superconducting Magnetic Bearings Using MPMG-YBaCuO

Fukuyama, H.; Seki, Kazutoshi; Takizawa, T.; Endou, Shigeru; Murakami, Masato; Takaichi, H.; Koshizuka, N.

doi:10.1007/978-4-431-68305-6_294

Cited by 23 publications

(5 citation statements)

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“…Bulk Y-Ba-Cu-O (YBCO) is widely accepted as a very promising high-temperature superconductor (HTS) for a number of high-field and -current applications, such as magnetic bearings, fault current limiters and flywheel energy storage systems [1][2][3][4]. The potential of YBCO derives from its ability to pin magnetic flux at liquid nitrogen temperatures (77 K) in the presence of an applied field of typically up to 5 T (i.e.…”

Section: Introductionmentioning

confidence: 99%

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Smith

Cardwell

Babu

et al. 2000

Supercond. Sci. Technol.

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Y-Ba-Cu-O (YBCO) precursor powder composed primarily of YBa 2 Cu 3 O 7−δ (Y-123) and Y 2 BaCuO 5 (Y-211) containing 0.1 w/w% Pt has been prepared by the evaporative decomposition of solution (EDS) and subsequent calcination for the fabrication of bulk melt-processed ceramics. The decomposition process in the as-produced powder and the formation of the Y-123 and Y-211 phases have been studied in detail using differential thermal analysis and powder x-ray diffractometry. The morphology, microstructure and particle size distribution of the powder has been investigated using scanning electron microscopy, transmission electron microscopy and particle size analysis, and the powder has been found to contain a significant proportion of sub-micrometre-sized particles. Samples fabricated by seeded melt growth using the EDS-prepared powder have been observed to exhibit a finer distribution of the Y-211 phase than is typically obtained in similar samples prepared via a mixed oxide route. This provides direct evidence of the suitability of EDS precursor powder for the fabrication of large-grain, high-J c melt-processed YBCO monoliths.

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Section: Introductionmentioning

confidence: 99%

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Smith

Cardwell

Babu

et al. 2000

Supercond. Sci. Technol.

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“…[1][2][3] The main potential of this material lies in its relatively high transition temperature of ϳ92 K and in its ability to pin magnetic flux at liquid nitrogen temperatures in the presence of an applied field of up to 5 T (i.e., as defined by the so-called irreversibility line 4 ). [1][2][3] The main potential of this material lies in its relatively high transition temperature of ϳ92 K and in its ability to pin magnetic flux at liquid nitrogen temperatures in the presence of an applied field of up to 5 T (i.e., as defined by the so-called irreversibility line 4 ).…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Cardwell

Dung

et al. 1996

J. Mater. Res.

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YBa 2 Cu 3 O 72d precursor powder suitable for the fabrication of melt-processed ceramic has been prepared by spray drying and subsequent calcination. The dehydration and decomposition processes in the nitrate-based spray-dried powder and the formation processes of the YBa 2 Cu 3 O 72d and Y 2 BaCuO 5 phases have been studied in detail using thermal analysis and powder x-ray diffractometry. The morphology, microstructure, and size distribution of the particles in the calcined powder have been investigated using high resolution scanning electron microscopy and particle size analysis and found to contain a significant proportion of submicron sized particles of Y 2 BaCuO 5 . Melt-processed samples prepared using the spray-dried powder have been observed to exhibit a significantly finer distribution of the 211 phase than is typically obtained in similar specimens prepared via a mixed oxide route. This provides direct evidence of the suitability of spray-dried precursor powder for the fabrication of large grain, high J c melt-processed YBCO ceramics.

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“…The importance of (rare earth)-Ba-Cu-O (REBCO) large grain materials has been demonstrated repeatedly by the achievement of high critical current densities (J c ) [1], the manipulation of the J c peak effect [2], the reproducible fabrication of large single grains and the exploitation of such materials in magnetic bearings [3][4][5], current leads [6][7][8] and motors [9]. YBCO large grains are the most well developed materials in the REBCO series.…”

Section: Introductionmentioning

confidence: 99%

Orientation control and transport properties ofc-oriented NdBCO-Ag large grains grown using a simple processing system

Saláma

2000

Supercond. Sci. Technol.

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Correlations among seeding temperature, the aspect ratio of NdBCO seeds and the growth morphologies of NdBCO-Ag grains have been conducted in detail. On the basis of these correlations, large c-axis-oriented NdBCO-Ag superconducting grains were fabricated using NdBCO seeds and a simple processing system which does not require detailed control of oxygen partial pressure. These NdBCO-Ag grains exhibited superconducting properties similar to NdBCO materials. In view of the simplicity of the processing system and the effectiveness of the seeding technique, scaling-up of the production of NdBCO-Ag large grain materials for engineering applications could be possible.

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An Improvement of the Static and Dynamic Characteristics of Superconducting Magnetic Bearings Using MPMG-YBaCuO

Cited by 23 publications

References 1 publication

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Orientation control and transport properties ofc-oriented NdBCO-Ag large grains grown using a simple processing system

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