We provide evidence that a single mechanism—flux flow along channels—can explain the functional form of the critical current density (Jc) in the low-temperature superconductor Nb3Sn and in the high-temperature superconductors (HTS) YBa2Cu3O7−δ (YBCO) and (Bi,Pb)2Sr2Can−1CunOx (BiSCCO) in low and high magnetic fields. In this …

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Abstract. Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the concomitant electron scattering increased the upper critical field mu0Hc2 to as high as 35 T at 0 K, as determined by the Werthamer-Helfand-Hohenberg equation.

Improved critical current density in ex situ processed MgB2 tapes by the size reduction of grains and crystallites by high-energy ball milling: Mukesh Goyal · Mukesh Goyal · Anindya Chakravarty · M.D. Atrey · M.D. Atrey Semi-analytical modeling of the coupled strain and low-temperature dependence of the normal-state resistivity in Nb3Sn

Similarly, Cho and Koch [10] determined that the LRO in ball-milled Nb3Sn disappeared after about 1 h of milling while amorphization was not initiated until 5-6 h of milling. 0925-8388/93/$6.00 1993- Elsevier Sequoia.

Effect of milling time on the lattice parameter a of MgB2. 4. Conclusions. In this study, we examined the combined effect of Ga-doping and ball-milling to optimized the microstructures and phase formation of MgB2 for eventual enhancement of superconducting properties. Densification was markedly improved by ex-situ sintering of ball-milled MgB2+Ga.

The CryoMill is a laboratory ball mill specifically designed for this application. It features an integrated cooling system which continually cools the grinding jar with liquid nitrogen before and during the grinding process. Thus, the sample is embrittled and volatile components are preserved. The liquid nitrogen is continually supplied from ...

We have fabricated the powder-metallurgy (P/M) processed Nb3Sn superconducting wires as the first trial for the development of P/M processed Nb3Sn wires for AC use. The Nb content was chosen as small as 22.5wt% so as to avoid the appearance of …

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Ball milling of rye bran gave rise to similar results, with the A/X ratio of the extractable AX being considerably lower (0.51). Optimization of the ball mill treatment by varying the degree of filling of the milling jar permitted us to obtain equally high WE-AX levels (>70%) in wheat and rye bran within a 24 h ball-milling period.

The critical currents of several Cu-Nb3Sn P/M multi- filamentary ribbons obtained after a reduction R =500 are shown in Fig. 4. The three upper curves correspond to samples containing Nb powders obtained by the hydride- dehydride process and the other curves correspond to P/M materials containing Nb powders produced by ball-milling.

Atomic disorder in Nb3Sn during heavy mechanical impact. Di, L-M; Loeff, PI; Bakker, H. Transformation of glassy indomethacin induced by ball-milling. Desprez, S; Decamps, M. Athermal character of the solid state amorphization of lactose induced by ball milling.

The A15 Nb3Sn compound is extremely brittle at tempera- tures below 1000, but the increase in micro- hardness values observed in ball-milled Nb3Sn indicates that the Nb3Sn compound can be plas- tically deformed under the stress state existing during milling and this normally "brittle" struc- ture can store the energy of cold work.

The direct mechanochemical amidation of esters by ball milling is described. The operationally simple procedure requires an ester, an amine, and substoichiometric KOtBu and was used to prepare a large and diverse library of 78 amide structures with modest to …

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High-energy ball milling is a solid state powder processing technique and is a very useful for preparing Nb-Al alloys (Nb3Al). The effects of ball milling time and annealing temperature on the ...

That plastic deformation can occur in nominally brittle Nb3Sn must be the result of a large hydrostatic component of the stress state in the powders during ball milling. View Show abstract

Abstract In the present work it is described the production of MgB2 samples by using the mixture of MgB2 with other diborides, (TaB2, VB2, and AlB2) which have the same C32 hexagonal structure as the MgB2, and simultaneous addition with the diborides and SiC, that contribute with C, to replace B in the crystalline structure of the matrix. As an important result, the critical …

A method of making a high density Mg—B superconducting article includes providing a packed powder sheath, said powder comprising a source of magnesium and boron, subjecting the packed powder sheath to a symmetric deformation, said deformation selected to elongate the packed powder sheath to form a wire while retaining the free flow of particles within the powder core, …

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Mechanical alloying, a high energy ball milling technique, was used to process elemental metal powders. Multifilamentary Cu-Nb3Sn composites were formed by mixing the mechanically alloyed Nb/Sn powders with Cu powders, isostatically compacting the mixture, hydrostatically extruding to wire form, and diffusion reacting to form the A15 superconducting …

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Milling at lower than ambient temperatures also reduces reaction with trace amounts of oxygen, carbon, H 2 O, sulfur, and nitrogen. [0056] In at least some embodiments, magnesium- and boron-containing powders are milled in a ball mill, a high energy ball mill or rod mill. Mechanical alloying may be accomplished by Spex, ball or rod milling.

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Elemental powders of niobium–tin and niobium–aluminum were mechanically alloyed by Spex ball mill, respectively, in order to fabricate disordered nanocrystalline Nb3Sn and Nb3Al.

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Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the conco...

The hardness of nanocrystalline Nb3Sn will be compared to that of nanocrystalline Fe, both prepared by ball-milling. Exuerimental The Ni3A1 and Ni3Si intermetallic compounds were prepared by arc melting together the appropriate amounts of nominally 99.99% pure Ni, A1, or Si in a partial pressure of pure argon, with a titanium getter.

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