Exploitable results
The objective of the project is to produce a shaped superconducting material with a thickness between 0.05 and 0.5 mm and a critical current density (Jc) of 10{6} to 10{7} Am{-2} at liquid nitrogen temperature by a low cost shaping technology which can be used for mass production. Suspension spinning and tape casting provide the possibility to produce free self supporting filaments or ribbons which can be subjected to further upgrading treatments to increase Jc of the ceramic superconducting material without contamination from other composite materials. The filaments and ribbons produced are not a final product but part of a complex composite conductor or ceramic superconducting material and metallic materials.
Progress has been attained in the development of a suspension for tape casting but some problems remain to be solved. A suspension for wire spinning has been formulated which allows the production of batches of wire. Work continues in order to obtain a higher current density. Experiments show that binder and additives can be removed almost completely at temperatures between 300 C and 500 C. Sintering may be performed on a number of substrates. Optimum results are obtained on yttrium barium copper oxide. Material with critical temperature (Tc) of 90 K and Jc of 300 Acm{-2} is obtained after sintering.
Although the experiments have been performed with yttrium barium copper oxide powder, their is no reason to doubt that tapes and wires can be prepared in a similar way with bismuth strontium calciumc opper oxide powder. In both cases a special treatment is needed to increase the critical current density to values useful for large scale applications.
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