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superconducting composites

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Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001110
EISBN: 978-1-62708-162-7
... composites, including assembly, welding, isostatic compaction, extrusion, wire drawing, twisting, and final sizing. The article also provides a detailed account of the properties and applications of NbTi superconducting composites. composite fabrication techniques matrix materials niobium-titanium...
Image
Published: 01 January 1990
Fig. 4 Variation of superconducting properties with compositional or antisite disorder. (a) Variation of the coupling constant, 2Δ/ k B T c with composition of Nb 3 Sn. The ratio is determined from tunneling data. Source: Ref 4 . (b) Plot of superconducting transition temperature More
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001113
EISBN: 978-1-62708-162-7
... electronic devices. The article gives a brief introduction on superconducting materials, substrates and buffer layers and discusses the major deposition techniques such as, electron-beam co-evaporation, sputtering from either a composite target or multiple sources and laser ablation. The article also...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001109
EISBN: 978-1-62708-162-7
... Losses Eddy current losses in multifilamentary composites can significantly increase the ac losses because currents are induced to flow in the resistive matrix surrounding the superconducting filaments. The induced eddy current will be proportional to the rate of change of the magnetic field...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003155
EISBN: 978-1-62708-199-3
... Abstract Superconductors are materials that exhibit a complete disappearance of electrical resistivity on lowering the temperature below the critical temperature. A superconducting material must exhibit perfect diamagnetism, that is, the complete exclusion of an applied magnetic field from...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001108
EISBN: 978-1-62708-162-7
... prefigures modern composite conductor manufacture by considering the properties of a resistive constantan wire coated with a superconducting layer of tin. Returning to Onnes's own words, it is only the last sentence that strike a false note. An accelerated progress to applications was reasonable to dream...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001114
EISBN: 978-1-62708-162-7
..., compositional inhomogeneities, microcracking, and misalignment of the a-b planes across the grain boundary. A superconducting weak link is normally associated with a weakly connected microscopic bridge or narrow constriction between two bulk superconductors. Weak link superconducting behavior was first...
Image
Published: 01 January 1990
Fig. 13 Niobium diffusion barrier-clad NbTi filaments extracted from the copper matrix of a composite designed for the superconducting supercollider. Courtesy of Supercon, Inc. More
Image
Published: 01 January 1990
Fig. 25 Heat-treatment/strain sequence incorporating three intermediate precipitation heat treatments to illustrate the development of nanometer scale structures in composites of NbTi. Courtesy of the Applied Superconductivity Center, University of Wisconsin-Madison More
Image
Published: 01 January 1990
Fig. 26 TEM micrographs of NbTi composite in cross sections after first precipitation heat treatment. (a) Transverse (corresponding to section C of Fig. 25 ). (b) Longitudinal. Courtesy of the Applied Superconductivity Center, University of Wisconsin-Madison More
Image
Published: 01 January 1990
Fig. 27 TEM micrographs of NbTi composite cross sections, after third precipitation heat treatment and a final strain of 4.13. (a) Transverse (corresponding to section H of Fig. 25 ). (b) Longitudinal. Courtesy of the Applied Superconductivity Center, University of Wisconsin-Madison More
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001111
EISBN: 978-1-62708-162-7
... that T c in Nb 3 Sn is dependent on disorder regardless of its origin ( Ref 6 ). In general, A15 compounds exhibit a high degree of ordering ( Ref 2 ). Fig. 4 Variation of superconducting properties with compositional or antisite disorder. (a) Variation of the coupling constant, 2Δ/ k B T c...
Image
Published: 01 January 1990
Fig. 13 Transverse cross section TEM photomicrograph of a portion of one filament of a Nb-46.5Ti composite wire. The light streaks are the α-Ti precipitates that are responsible for flux pinning through the core interaction. This wire has a large pinning force, with J c = 3150 A/mm 2 at 5 More
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001112
EISBN: 978-1-62708-162-7
...). This article discusses the fabrication methods of PbMo6S8 (PMS) and SnMo6S8 (SMS), including hot processing and cold processing. It provides a short note on the superconducting properties of PMS wire filaments and their applications in processes requiring high magnetic fields, such as high-energy physics...
Book Chapter

By W.L. Johnson
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001095
EISBN: 978-1-62708-162-7
.... (b) Heat capacity of an undercooled melt as a function of temperature. Also shown is the typical heat capacity of the corresponding crystalline solid (at the same composition). Many naturally occurring minerals, such as volcanic obsidian, exhibit a glassy structure. The earliest evidence...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001294
EISBN: 978-1-62708-170-2
... the vaporization temperature. A plume of evaporated material is ejected from the target and is collected on a nearby substrate. The congruent non-equilibrium evaporation of multicomponent materials and the transfer of the target composition to the deposited film make available high-quality thin films of materials...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001461
EISBN: 978-1-62708-173-3
... temperatures can be as low as 4 K) provides opportunities to exploit special material properties associated with such low temperatures (superconductivity, for example). However, these opportunities must be weighed against some potential high penalties, such as the loss of structural properties exhibited...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001464
EISBN: 978-1-62708-173-3
... Abstract Cryogenic temperatures cause many structural alloys to become brittle, which is an unacceptable condition in most structural applications and is rectified by optimizing the weld composition. Although nonmatching weld compositions are most appropriate, differences between the welds...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0005549
EISBN: 978-1-62708-162-7
... energy of the I intensity; electrical current; bias current L longitudinal; liter I ej critical current of the junction L twist pitch distance of the composite superconducting state I r resistive current GA gas atomization Is supercurrent through junction wire; length of straight bar magnet Ib pound gal...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004008
EISBN: 978-1-62708-185-6
.... It presents an overview of the processes, equipment, dies and die materials, and lubrication associated with drawing of rod, wire, bar, and tube. The article also provides a discussion on the design considerations and manufacturing of commercial superconducting multifilamentary conductors. bar drawing...