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Cold synthesizing method for obtaining bar-like semifinished product frow which to produce high-performance super conducting cables

A technology for semi-finished products and cables, which is applied in the field of cold synthesis for obtaining rod-shaped semi-finished products for manufacturing high-performance superconducting cables, and can solve problems such as low critical current

Inactive Publication Date: 2004-06-30
EMS EUROPA METALLI SUPERCONDUCTORS SPA
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  • Description
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Problems solved by technology

[0004] The main disadvantage of superconductors and especially NbTi cables as mentioned above is their very low critical current (Jc) compared to the capabilities of the alloy

Method used

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  • Cold synthesizing method for obtaining bar-like semifinished product frow which to produce high-performance super conducting cables
  • Cold synthesizing method for obtaining bar-like semifinished product frow which to produce high-performance super conducting cables
  • Cold synthesizing method for obtaining bar-like semifinished product frow which to produce high-performance super conducting cables

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Embodiment Construction

[0019] With reference to the accompanying drawings, numeral 1 (Fig. 5) represents the whole of the rod-shaped semi-finished product manufactured by the cold synthesis method according to one aspect of the present invention, and this semi-finished product can be used among the method for manufacturing superconductor cable, according to another aspect of the present invention, its Characterized by the fact that any one plastic deformation step is completely e.g. cold deformation at ambient temperature, as in the process figure 1 shown.

[0020] The invention begins with rods 2 manufactured by known methods, each rod comprising a core defined by monofilaments and multifilaments of superconductor material, in particular NbTi alloy, and a copper sheath, possibly with a superconductor interposed between copper and Barrier layers made of precious metals or metal alloys. In the case of a multi-filament rod, the core consists of 121 individual filaments made of a superconducting alloy...

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Abstract

To improve the performance of superconducting cables, a composition method for obtaining a bar-like semifinished product by exclusively cold plastic deformation operations has been devised, and which includes the steps of: forming round-section, mono- or multifilament, superconducting copper bars of relatively long length; assembling the bars about a cylindrical copper core of substantially the same length, using assembly templates which open book-fashion and are fitted to and slide along an assembly bench, the templates having through holes arranged in a circle to support the bars, and a central through seat for supporting the core; tying the bars onto an outer lateral surface of the core; sliding onto one end of the assembly so formed a number of metal supporting rings resting on the assembly bench, while sliding the templates off the opposite end of the assembly; sliding a copper tube onto the assembly so formed, while at the same time cutting the ties in axial sequence and sliding off the supporting rings; and performing a number of drawing operations on the finished assembly to gradually reduce the cross section and increase the length of the assembly to obtain a bar-like semifinished product of the required dimensions, from which, after salt bath heat treatment, a superconducting cable is obtained by cold drawing.

Description

technical field [0001] The present invention relates to a cold synthesis method for obtaining rod-shaped semi-finished products that can be used for the manufacture of superconducting cables, in particular niobium-titanium (hereinafter referred to as "NbTi") superconducting cables. [0002] The invention also relates to a superconducting cable produced from this rod-shaped semi-finished product. Background technique [0003] Currently, superconductors, especially NbTi cables, are manufactured from an assembly consisting of: a cup-shaped copper ingot into which is sequentially inserted a rod with a core of superconducting material made of one or more NbTi metal Wire bound, and a copper (and / or other precious metal) sheath. The rods are short (up to about 800 mm) and have a hexagonal cross-section to facilitate mounting on the copper ingot. The free end of the copper ingot is then sealed by welding a copper cap, a vacuum is formed in the body of the assembly thus formed, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C27/02H01B12/00H01B12/02H01B12/10H01B13/00
CPCH01B12/02Y02E40/641Y10S505/786Y10T29/49194Y10T29/49123Y10T29/49117Y10T29/49014Y10T29/5187Y02E40/60
Inventor 塞尔希奥·罗西
Owner EMS EUROPA METALLI SUPERCONDUCTORS SPA
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