Hydrostatic extrusion of BSCCO/Ag composite wire

Bingert, J. F.; Bingham, B.; Sebring, R. J.; Kelly, A. M.

doi:10.1007/bf02652998

Cited by 5 publications

(5 citation statements)

References 4 publications

(1 reference statement)

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“…The fact that it is possible to obtain quite large reduction ratios in the extrusion process makes it an efficient process for large-scale production. However, it is rather difficult to obtain homogeneous Bi-2223/Ag composites by extrusion [19,31].…”

Section: Drawing and Extrusionmentioning

confidence: 99%

The mechanical deformation of superconducting BiSrCaCuO/Ag composites

Han

Skov-Hansen

Freltoft

1997

Supercond. Sci. Technol.

106

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The mechanical deformation of BiSrCaCuO/Ag composites made by the powder-in-tube method is a multi-step process. The main difficulty is that the mechanical properties of the ceramic powder are very different from those of the Ag sheath. A key parameter is the core density, which changes during mechanical deformation. In this review, basic concepts of the classical mechanical deformation theory are briefly discussed. Simple descriptions of deformation processes like pressing, rolling, drawing and extrusion are also presented. The term 'freedom parameter', f , is introduced to illustrate the influence of various constraint factors on the mass-flow behaviour. Simple pictures including mass redistribution and the powder-flow model are presented for interpreting the plastic deformation process of the composites. Experimental results are reviewed and our proposed pictures and models are applied for discussion.

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Section: Drawing and Extrusionmentioning

confidence: 99%

The mechanical deformation of superconducting BiSrCaCuO/Ag composites

Han

Skov-Hansen

Freltoft

1997

Supercond. Sci. Technol.

106

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“…They also investigated the effect of the hydrostatic medium on the process. Bingert et al [5] performed hydrostatic extrusion on BSCCO/Ag composite wire and estimated the effects of the extrusion process parameters on the uniformity and density of the wire. Park et al [6] performed finite element analysis for the hydrostatic extrusion of copper-clad aluminum tubes and developed a model to predict the deformation of bi-metal tubes in the hydrostatic extrusion process.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that a hydrostatic extrusion process has many advantages over conventional extrusion processes in that extrusion can be achieved with a high extrusion ratio, large die angle, and more uniform metal flow due to excellent lubrication between the metal and die. Accordingly, extensive research has been carried out on hydrostatic extrusion in applying the technology to produce fine wires and clad materials [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of aluminum/copper clad composite using hot hydrostatic extrusion process and its material characteristics

Rhee

Wang

Park

et al. 2004

Materials Science and Engineering: A

115

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“…Wesche et al reported that J c is diameter dependent and increases with decreasing superconductor wire dimensions [6]. Bingert et al discussed the desirable characteristics of wires and tapes, including dimensional uniformity, high relative oxide core density and large core-to-clad ratio [7]. Therefore, initial billet condition and the forming procedures used to reduce the size and dimension, which determine the characteristics of the resulting wires and tapes, could play important roles in the ultimate performance of these superconductors.…”

Section: Introductionmentioning

confidence: 99%

Drawing of Ag-clad superconductor wires

Yuan¹,

Pollock²,

Kajuch³

1997

Supercond. Sci. Technol.

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The powder-in-tube process has been widely used to fabricate long lengths of Bi 2 Sr 2 CaCu 2 O 8 (Bi-2212) superconducting wires and tapes. However, there is not a good understanding of the processing variables involved in the wire-drawing process. Recent studies indicated that powder characteristics, such as particle size distribution and morphology, had a significant effect on the consolidation behaviour of Bi-2212 green compacts. In this investigation, silver-clad Bi-2212 composite wires containing powders of two different particle sizes were fabricated. The effects of initial packing density and sheath thickness on the characteristics of the wires, including elongation, silver:core ratio and relative core density, were investigated. It is observed that coarse powders with a wide particle size distribution produce wires with higher core density and a moderate benefit is obtained from higher initial powder packing density.

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Hydrostatic extrusion of BSCCO/Ag composite wire

Cited by 5 publications

References 4 publications

The mechanical deformation of superconducting BiSrCaCuO/Ag composites

The mechanical deformation of superconducting BiSrCaCuO/Ag composites

Fabrication of aluminum/copper clad composite using hot hydrostatic extrusion process and its material characteristics

Drawing of Ag-clad superconductor wires

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