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Title Optimization studies on thermal and mechanical manufacturing processes for multifilament superconducting tape and wire
URL
Publication Date
Date Accessioned
Degree MS
Discipline/Department Mechanical Engineering
Degree Level masters
University/Publisher Texas A&M University
Abstract There are many parameters that significantly affect the electrical performance of ceramic-core superconducting composite wire and tapes, which remain ambiguous and require more labor on their optimization. BSCCO 2212 has not been paid the attention and investment it deserves. In this regard, all optimization efforts were made for BSCCO 2223. In our work, a practical and inexpensive manufacturing method, thermally and mechanically optimized for Pb doped BiSrCaCuO 2212 superconducting multifilament (38 filaments) wires and tapes, was successfully employed. Optimized parameters can be classified under material, mechanical (deformation) and heat treatment (thermal) subgroups. Parameters involved with materials included investigation of deformation behavior of two different sheath metals; pure silver and 0.02% magnesia dispersion reinforced silver alloy. Pb doped BiSrCaCuO 2212 ceramic superconductor powder, the other source of material related parameters, was synthesized following the "Thermal Co-decomposition or Wet Mix" method. Fabrication of mono and multifilament wires with Oxide Powder in Tube (OPIT) method followed next. Optimization of drawing deformation was practiced to achieve the best ceramic grain alignment and smoother ceramic powder core/metal sheath interface in order to avoid "sausaging" in wires. Rolling of the wire products into tapes by following different deformation regimes was the other manufacturing stage of the project. Variable and constant reduction-per-pass deformation paths were employed to reveal their effects on our composites with distinct sheath material and filament formation. The search for the best (optimum) heat treatment schedule for our Bi2212 superconductor composites, a modified version of "step solidification partial melting", was employed successfully. A solution through tried recipes for the bubbling problem that occurred with our tapes was also addressed. Electrical performance tests of fully reacted wires were carried out in our laboratory and very promising results were attained.
Subjects/Keywords BSCCO; superconductor tape; superconductor wire
Contributors Yavuz, Mustafa (advisor); McIntyre, Peter M. (advisor); Hogan, Harry A. (committee member); Karaman, Ibrahim (committee member)
Language en
Country of Publication us
Record ID handle:1969.1/1202
Repository tamu
Date Retrieved
Date Indexed 2020-08-12
Grantor Texas A&M University
Issued Date 2004-11-15 00:00:00

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…38 24 Sausaging formation during rolling operations [5] ....................................... 39 25 Cross section of an as drawn multifilament BSCCO wire and its deformed states into tape by pressing…

…41 26 Vickers Hardness values for BSCCO core in tape transverse cross section [5]............................................................................................. 43 27 Schematic illustration of changes in texturing…

…Pb)-2212 Powder Preparation .................................................................. Literature Survey on Superconductor Tape and Wire Manufacturing: OPIT Method, Drawing and Rolling Processes, Silver Clad Sheath Properties…

…Silver Clad Sheath: Silver Alloys Used In Composite BSCCO Superconductors ............................................................................................ Fabrication of Mono and Multifilament Wire…

…Fabrication of Mono and Multifilament Tape............................................... 10 KINETICS, PHASE TRANSFORMATION AND GRAIN ALIGNMENT OF Bi(Pb)-Sr-Ca-Cu-O SYSTEM…

…stress, σH ..................................................... 25 13 Schematic of the direction of plastic strain in the roller gap corresponding to; (a) Small rollers and wide tape (b) Large rollers and narrow tape .......... 26…

…16 Cracking patterns during rolling and pressing processes on HTSCs ............ 29 17 Cracks in HTSC core in Ag sheathed tape (1) transverse section after pressing (2) longitudinal section after rolling…

…32 20 Tape rolling ................................................................................................... 34 21 Wire drawing................................................................................................. 35 xii…

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