Grain size dependence of critical current densities in hot isostatically pressed SnMo/sub 6/S/sub 8/

Bonney, L.A.; Willis, T.C.; Larbalestier, D. C.

doi:10.1109/77.233361

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…The observation that magnetization scales with the sample size suggests that there is no intrinsic granularity. This observation has been confirmed by Bonney et al [ 12] in HIP-treated SnMorSs bulk samples by comparing J¢(AH)/J¢(AM) where All is the reversed external field to invert the critical state and AMis the magnetization hysteresis at a given external field. In the case where the ratio J¢(AH)/ J¢(AM) is approaching unity the better grains are connected, and deviations above 2 are characteristic for granular behavior [ 13 ].…”

Section: Earlier Hip Worksupporting

confidence: 70%

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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Section: Earlier Hip Worksupporting

confidence: 70%

Critical current distribution of hot isostatically pressed PbMo6S8 wires

Seeber

Cheggour

Perenboom

et al. 1994

Physica C: Superconductivity

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“…Grain size only increased from ~8 9 nni to ~1 4 3 nin in 80 11 at 1000 "C the Li-based bulk samples, while it is rather larger (630 nm) in the Nibased samples. Despite the fine CP grains, we were not able to get the full densification achieved in [4], [ll], [14] with larger prereacted elemental powders.…”

mentioning

confidence: 96%

“…wisc . edu, F A X 608-263-1087. at lower fields, grain-boundary pinning controls J , in PbMo,jSa and SnMoGSs bulk samples [3] ~ [4]. However …”

mentioning

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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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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