High-current conductors using high-temperature superconductors

Article Abstract:

Research teams from the Hirst Division of GEC-Marconi Materials Technology, the research and development departments of Pirelli Cables and BICC Cables and the Corporate Research Laboratories of Siemens and Alcatel-Alsthom have worked together to develop high-current conductors using high-temperature superconductors. Particular attention was given to ways of processing the Y-123, Tl-based and Bi-based superconductors into long lengths of composite conductor which can carry many amperes. It was found that the powder-in-tube processing of the Bi-2223 phase offers a relatively cheap was of producing long lengths of HTS tape.

Electric properties, Superconductors

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Depressing the melting point of solders and brazes by eutectic alloying

Article Abstract:

Alloying can be used to lower the melting point for metals. Eutectic alloying is a suitable process for fillers, since such alloys spread well when they have melted, and complete melting is possible at a temperature below the the temperature needed for the metals making up the alloy. There is a problem of diminishing returns in seeking to lower temperatures in this way. Bismuth and tin, or silver with copper and tin are possible replacements for lead and tin in solders.

Secondary Smelting, Refining, and Alloying of Nonferrous Metal (except Copper and Aluminum), Solder, Research, GEC Automation Projects Inc.

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Shear strength of diffusion soldered joints

Article Abstract:

Silver/tin and silver/indium diffusion soldering systems were used to make double lap joints to mild steel substrates, and their longitudinal shear strength measured over 53MPa. The problems of using filler alloys to join ceramics to metal, the method used for the test joints, and the resulting joints are discussed in technical detail.

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