Studies of electron beam coevaporated Nb&amp;lt;inf&amp;gt;3&amp;lt;/inf&amp;gt;Sn composites: Critical current and microstructure

Hammond, R. H.; Jacobson, Bertil; Geballe, T. H.; Talvacchio, J.; Salem, J.; Pohl, H.; Braginski, A. I.

doi:10.1109/tmag.1979.1060214

Cited by 19 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These authors succeeded in demonstrating a qualitative agreement between their phase diagram, produced by combinatorial techniques, and that determined by conventional methods. 10 Independently, Berlincourt, at the U.S. Office of Naval Research (as director of the Physical Science Division), proposed a national effort to conduct a search for high-temperature superconductors using gradient-deposition methods and automated screening techniques. In 1967, Miller and Shirn 5 analyzed the Au-SiO 2 system using a cosputtering technique.…”

mentioning

confidence: 99%

Combinatorial Materials Science: What's New Since Edison?

Amis¹,

Xiang²,

Zhao³

2002

MRS Bull.

105

View full text Add to dashboard Cite

Combinatorial methods are high-efficiency methods to create large composition "libraries" of materials, for example, continuous composition variations, and test those compositions systematically in parallel for specific properties of interest, in contrast to the time-consuming one-composition-at-a-time approach. These methods have captured the attention of the materials industry with the promise of providing new discoveries "faster, better, and cheaper." However, in the academic community, combinatorial methods often meet with less enthusiasm, perhaps due to the perception of combinatorial methodology as an Edisonian approach to science. The facts are quite to the contrary. In addition to impressive successes arising from the application of combinatorial methods to materials discovery, results coming out of systematic high-throughput investigations of complex materials phenomena (which would be too time-consuming or expensive to undertake) provide data leading to improvement in theories and models of materials chemistry and physics. Indeed, combinatorial methods provide a new paradigm for advancing a central scientific goal-the fundamental understanding of structure-property relationships of materials behavior.

show abstract

mentioning

confidence: 99%

Combinatorial Materials Science: What's New Since Edison?

Amis¹,

Xiang²,

Zhao³

2002

MRS Bull.

105

View full text Add to dashboard Cite

show abstract

“…Titanium is often introduced by alloying with the tin core. The highest current density is found in equiaxed grains, those initially formed 19 . To produce fine equiaxed grains a number of techniques have been explored.…”

Section: Layer Current Densitymentioning

confidence: 98%

A Method to Increase Current Density in a Mono Element Internal Tin Processed Superconductor Utilizing Zr Oxide to Refine Grain Size

Zeitlin¹,

Gregory²

2008

View full text Add to dashboard Cite

The effect of Oxygen on (Nb1Zr) 3 Sn multifilament conductors manufactured by the Mono Element Internal Tin (MEIT) process was explored to improve the current density by refining the grain size. This followed work first done by General Electric on the Nb 3 Sn tape process. Techniques to fabricate the more difficult Nb1Zr composites are described and allowed fabrication of long lengths of .254 mm diameter wire from an 88.9 mm diameter billet. Oxygen was incorporated through the use of SnO 2 mixed with tin powder and incorporated into the core. These were compared to samples with Ti+Sn and Cu+Sn cores. Heat treatments covered the range of 700˚C to 1000˚C. Current density vs. H, grain size, and reaction percentages are provided for the materials tested. The Oxygen gave superior results in the temperature range of 815-1000˚C. It also stabilized the filament geometry of the array in comparison to the other additions at the higher temperatures. At 815˚C a peak in layer J c yielded values of 2537 A/mm 2 at 12 T and 1353 A/mm 2 at 15T, 8-22% and 30-73% greater respectively than 700˚C values. Results with Oxygen at high temperature show the possibility of high speed continuous reaction of the composite versus the current batch or react in place methods. In general the Ti additions gave superior results at the lower reaction temperature. Future work is suggested to determine if the 815˚C reaction temperature can lead to higher current density in high tin (Nb1Zr+O x) 3 Sn conductors. A second technique incorporated oxygen directly into the Nb1Zr rods through heat treatment with Nb 2 O 5 at 1100˚C for 100 hours in vacuum prior to extrusion. The majority of the filaments reduced properly in the composite but some local variations in hardness led to breakage at smaller diameters.

show abstract

“…Titanium is often introduced by alloying with the tin core. The highest current density is found in equiaxed grains, those initially formed 12 . Small filaments produce higher current densities as the reaction layer is composed of a larger volume fraction of equiaxed fine grains.…”

Section: Introductionmentioning

confidence: 98%

A HIgh Current Density Low Cost Niobium 3 Tin Titanium Doped Conductor Utilizing A Novel Internal Tin Process

Zeitlin¹

2005

View full text Add to dashboard Cite

An internal tin conductor has been developed using a Mono Element Internal Tin (MEIT) with an integral Nb barrier surrounding the Nb filaments. High current densities of 3000 A/mm 2 + at 12 T and 1800 A/mm 2 at 15 T have been achieved in conductors as small as 0.152 mm with the use of Nb7.5Ta filaments and Ti in the Sn core. In contrast, conductors with pure Nb and Ti in the Sn achieved 2700 A/mm 2 at 12 T. Two internal fins, developed and patented on the project, were introduced into the filament array and reduced the effective filament diameter (D eff ) by 38%. Additional fins will further reduce D effThe conductor was produced from 152.4 mm diameter billets to produce wire as small as 0.152 mm. The process promises be scaleable to 304 mm diameter billets yielding wire of 0.304 mm diameter. The MEIT process wire was easy to draw with relatively few breaks. The cost of this conductor in large production quantities based on the cost model presented could meet the 1.5 $/kilo amp meter(KAM) target of the HEP community. NOTICEThis report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their awardees, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed or represents that its use would not infringe privately-owned rights. IntroductionThe High Energy Physics community has been encouraging and sponsoring the development of Superconductors for Accelerator applications for over forty years. The Superconducting Tevatron at Fermilab and the Large Hadron Collider (LHC) under construction at CERN are evidence that these efforts have born fruit. The community could say that superconductors have been an enabling technology for many of the discoveries over the last several decades.

show abstract

Studies of electron beam coevaporated Nb<inf>3</inf>Sn composites: Critical current and microstructure

Cited by 19 publications

References 7 publications

Combinatorial Materials Science: What's New Since Edison?

Combinatorial Materials Science: What's New Since Edison?

A Method to Increase Current Density in a Mono Element Internal Tin Processed Superconductor Utilizing Zr Oxide to Refine Grain Size

A HIgh Current Density Low Cost Niobium 3 Tin Titanium Doped Conductor Utilizing A Novel Internal Tin Process

Contact Info

Product

Resources

About