Current carrying properties of the HIP treated Mo-sheath PbMo/sub 6/S/sub 8/ wires

Yamasaki, H.; Umeda, M.; Kimura, Yoichi; Kosaka, S.

doi:10.1109/20.133377

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…Just as microhardness did not reach expected values, critical current densities increased greatly with densification, but never reached the 200 A/mm2 at 20 T benchmark previously set [5]- [8]. We believe that the J , values were low due to insufficient densification.…”

Section: Crztacal Current Deiisatymentioning

confidence: 62%

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Hot isostatic pressing of Chevrel phase bulk and hydrostatically extruded wire samples

Willis

Jablonski

Larbalestier

et al. 1995

IEEE Trans. Appl. Supercond.

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Abutmct--In order to lower final siiiteriiig temperatures for Chevrel phase ( C P ) wires, we have iiivestigated low-temperature hot isostatic pressing (HIP'ing) of both bulk and wire samples. We have fabricated (Pb,Sn)-based Chevrel phase (CP) monofilament and 61 filament wires by hydrostatic extrusioii of (Cu or Cu-Ni)/(Nb or V ) / C P composites, followed by cold drawing. We have investigated the CP/barrier reaction during heat treatment. fiiidiiig V is unsuitable. but N h is suitable a t these lower teiiiperatures for prereacted Pbl Sii,Mo6 Sa cores. We prepared powders of the biliary Chevrel phase Moas8 by acid leaching of Li,Mo,Sa aiid Ni,MoeS8. We prepared bulk samples of PbMocSR aiid Pbl-,Sii,MocSg by HIP'iiig mixtures of '*Pb+MocSs" powders ( z i i 4 z f u route) or by prereactiiig Pb, Sn aiid Moss8 powders before HIP'iiig (prereacted route). The zn sztu powders were HIP'ed uiider different time-t~inperature-pressure coiidi tioiis up to 1 2 h/GOO "C/200 MPa, producing partially consolidated PbMoeS8 samples. Further HIP'iiig of all saiiiples at temperatures of 700, 800 and 1000 OC, 200 MPa pressure and tiiiies of 8 aiid 80 hours produced additional consolidation, up to 95% of full density. As the aggressiyeiiess (temperature and time iiiider pressure) of the H I P process increased, the density, hardness, critical temperature, aiid inagnetization critical current deiisi ty increased.

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Section: Crztacal Current Deiisatymentioning

confidence: 62%

“…Furthermore, the J , values of RMSG are slightly smaller than those of typical samples HIP'ed at 800 "C[11], and almost an order of magnitude lower than those of the best HIP'ed samples [5], [GI, [14], although RMSG is not as fully densified as the best samples.…”

Section: Crztacal Current Deiisatymentioning

confidence: 99%

Hot isostatic pressing of Chevrel phase bulk and hydrostatically extruded wire samples

Willis

Jablonski

Larbalestier

et al. 1995

IEEE Trans. Appl. Supercond.

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“…Brittle Chevrel phase superconductors have been successfully made in the form of long wire by this method [98]. YBaCuO wires have also been fabricated in the same manner.…”

Section: Powder-in-tube Methods [ 171mentioning

confidence: 99%

Processing of bulk YBaCuO

Murakami

1992

Supercond. Sci. Technol.

317

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In this review, I summarize processing of bulkYBa,Cu,O, superconductors with an emphasis placed on t h e relationship between microstructure and critical currents. Sintering is commonly used in ceramic processing but has been unsuccessful in producing h i g h J , materials, primarily d u e to the weak links at grain boundaries. Melt processes have been found to be effective in increasing J, values through a combination of grain alignment and the introduction of pinning centres. Some possible applications of melt processed superconduciors in buik iorm are ais0 iniroduced in ihis review. Aiiinough m a n y anempts have been made to fabricate long conductors, J. values are still very small for long conductors, while the length is limited for highJ, materials.

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“…With respect to a conventional annealing without pressure, nearly the same Jc have been obtained. Yamasaki et al [6,7] were the first to apply HIP to PMS wires with a molybdenum barrier. It has been observed that conventionally annealed PMS wires show an important porosity and the Jc is limited to about 2× l0 s A m -2 at 8 T and 4.2 K. In addition, the ratio of J¢(HII)/ J¢(H± ) is near unity, suggesting a non-unidirectional, percolation-type current flow through the wire.…”

Section: Earlier Hip Workmentioning

confidence: 99%

Critical current distribution of hot isostatically pressed PbMo6S8 wires

Seeber

Cheggour

Perenboom

et al. 1994

Physica C: Superconductivity

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The ebMo6Ss Chevrel phase has an important potential for the construction of ultra-high-field superconducting coils. The critical current density of hot isostatically pressed (HIP) PbMorSs wires with a stainless steel matrix and a molybdenum diffusion barrier was investigated in fields up to 25 T. The field dependence of Jc is considerably improved in the high-field regime by going from a 990"C, 4 h to a 1225"C, 4 h HIP treatment at 110 MPa. However, a drop of Jc at unusually low fields as 15 T was observed. The appearance of a double peak in the critical current distribution, obtained by dV2/d/2 suggests that the origin of such a behavior is a strongly reduced effective upper critical field B*2, presumably at grain boundaries. A detailed analysis of the critical current distribution reveals that only a few percent of the wire is in a dissipative state at an electric field criterion of I ~t V cm-~, indicating that the used HIP parameters are not yet optimized.

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Current carrying properties of the HIP treated Mo-sheath PbMo/sub 6/S/sub 8/ wires

Cited by 12 publications

References 8 publications

Hot isostatic pressing of Chevrel phase bulk and hydrostatically extruded wire samples

Hot isostatic pressing of Chevrel phase bulk and hydrostatically extruded wire samples

Processing of bulk YBaCuO

Critical current distribution of hot isostatically pressed PbMo6S8 wires

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