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Fabrication Of Composite High Temperature Superconductor Wires From Ag Yba Sub 2 Cu Sub 3 O Sub X Power Produced By Agno Sub 3 Decomposition
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Book Synopsis Fabrication of Composite High Temperature Superconductor Wires from Ag/YBa Sub 2 Cu Sub 3 O Sub X Power Produced by AgNO Sub 3 Decomposition by : William A. Ferrando
Download or read book Fabrication of Composite High Temperature Superconductor Wires from Ag/YBa Sub 2 Cu Sub 3 O Sub X Power Produced by AgNO Sub 3 Decomposition written by William A. Ferrando and published by . This book was released on 1990 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief discussion of the history and generic properties of superconductors is given. Arguments favoring the use of microscopically uniform silver additions to the high temperature superconducting ceramic oxide powders are made. After treating some conventional Ag deposition methods and their shortcomings in this application, a novel, inexpensive method involving the decomposition of AgNO3 is presented. Conventional wire fabrication methods, as adapted to processing the high temperature superconductor materials, are discussed. Test equipment for measurement of the important superconducting properties of critical temperature (Tc) and critical current (Jc) is described. Finally, some early results on wire segments fabricated at the Naval Surface Warfare Center (NSWC) are given. (rh).
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991 with total page 1270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Method for Preparation of Textured YBa.sub. 2 Cu.sub. 3 O.sub.x Superconductor by :
Download or read book Method for Preparation of Textured YBa.sub. 2 Cu.sub. 3 O.sub.x Superconductor written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present invention relate to textured YBa.sub. 2 Cu.sub. 3 O.sub.x (Y-123) superconductors and a process of preparing them by directional recrystallization of compacts fabricated from quenched YBCO powders at temperatures about 100.degree. C. below the peritectic temperature to provide a superconductor where more than 75% of the YBa.sub. 2 Cu.sub. 3 O.sub.x phase is obtained without any Y.sub. 2 BaCuO.sub. 5.
Book Synopsis Transilvanie, Valaquie et Moldavie by :
Download or read book Transilvanie, Valaquie et Moldavie written by and published by . This book was released on with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silver Sheathing of High-T Sub C Superconductor Wires by :
Download or read book Silver Sheathing of High-T Sub C Superconductor Wires written by and published by . This book was released on 1990 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The properties of Ag sheaths on high-temperature super-conductors are examined. Ag is chemically compatible with YBa2Cu3O(subscript x) and Bi-based superconductors can be safely coprocessed with them. Residual stresses created by differences in thermal expansion coefficients are favorable and can be controlled by proper annealing. Although Ag forms low-resistance contact with high-temperature superconductors, it is not certain that effective cryogenic stabilization by Ag can occur at 77 K and above. 42 refs., 7 figs.
Book Synopsis Degradation of Properties of YBa Sub 2 Cu Sub 3 O Sub X Superconductors Sintered in CO Sub 2 -containing Atmosphere by :
Download or read book Degradation of Properties of YBa Sub 2 Cu Sub 3 O Sub X Superconductors Sintered in CO Sub 2 -containing Atmosphere written by and published by . This book was released on 1990 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stability of the YBa2Cu3O(subscript x) (YBCO) superconductor toward reacting with CO2 in CO2/O2 gas mixtures during sintering was investigated as a function of the partial pressure of CO2 and temperature. The transport critical current density, J{sub c}, of the superconductor decreased drastically with increasing partial pressure of CO2 was increased, J{sub c} became zero (at 77 K) even though the major phase of the sample was still a superconductor as determined by magnetic susceptibility measurements. Microstructures and compositions of the samples were investigated by transmission electron microscopy in conjunction with energy-dispersive x-ray spectroscopy. Two types of grain boundaries were observed: (approximately)10% of the grain boundaries contained a second phase; the regions near the remaining grain boundaries were tetragonal. At high partial pressures of CO2, the YBCO completely decomposed to BaCO3, Y2BaCuO5, and CuO. 11 refs., 3 figs.
Book Synopsis Extrusion of Metal Oxide Superconducting Wire, Tube Or Ribbon by :
Download or read book Extrusion of Metal Oxide Superconducting Wire, Tube Or Ribbon written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A process for extruding a superconducting metal oxide composition YBa.sub. 2 Cu.sub. 3 O.sub. 7-x provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6-85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for extrusion contains a polymeric binder to provide a cohesive mass to bind the particles together during the extrusion process with the binder subsequently removed at lower temperatures during sintering. The composition for extrusion further includes a deflocculent, an organic plasticizer and a solvent which also are subsequently removed during sintering. Electrically conductive tubing with an inner diameter of 52 mil and an outer diameter of 87-355 mil has also been produced. Flat ribbons have been produced in the range of 10-125 mil thick by 100-500 mil wide. The superconducting wire, tube or ribbon may include an outer ceramic insulating sheath co-extruded with the wire, tubing or ribbon.
Book Synopsis Method for Preparing Preferentially Oriented, High Temperature Superconductors Using Solution Reagents by :
Download or read book Method for Preparing Preferentially Oriented, High Temperature Superconductors Using Solution Reagents written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A multi-domained bulk REBa.sub. 2 CU.sub. 3 O.sub.x with low-angle domain boundaries which resemble a quasi-single domained material and a method for producing the same comprising arranging multiple seeds, which can be small single crystals, single domained melt-textured REBa.sub. 2 CU.sub. 3 O.sub.x pieces, textured substrates comprises of grains with low misorientation angles, or thick film REBa.sub. 2 CU.sub. 3 O.sub.x deposited on such textured substrate, such seeds being tailored for various REBa.sub. 2 CU.sub. 3 O.sub.x compounds, in specific pattern and relative seed orientations on a superconductor precursor material which may be placed in contact with a porous substrate so as to reduce the amount of liquid phase in the melt. Because seeds can be arranged in virtually any pattern, high quality REBa.sub. 2 CU.sub. 3 O.sub.x elements of virtually unlimited size and complex geometry can be fabricated.
Book Synopsis Method for Fabrication of High Temperature Superconductors by :
Download or read book Method for Fabrication of High Temperature Superconductors written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A layered article of manufacture and a method of manufacturing same is disclosed. A substrate has a biaxially textured MgO crystalline layer having the c-axes thereof inclined with respect to the plane of the substrate deposited thereon. A layer of one or more of YSZ or Y.sub. 2O.sub. 3 and then a layer of CeO.sub. 2 is deposited on the MgO. A crystalline superconductor layer with the c-axes thereof normal to the plane of the substrate is deposited on the CeO.sub. 2 layer. Deposition of the MgO layer on the substrate is by the inclined substrate deposition method developed at Argonne National Laboratory. Preferably, the MgO has the c-axes thereof inclined with respect to the normal to the substrate in the range of from about 10.degree. to about 40.degree. and YBCO superconductors are used.
Book Synopsis Method of Producing Superconducting Fibers of YBA2CU30X. by :
Download or read book Method of Producing Superconducting Fibers of YBA2CU30X. written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibers of YBa.sub. 2 Cu.sub. 3 O.sub.x have been produce by pendant drop melt extraction. This technique involves the end of a rod of YBa.sub. 2 Cu.sub. 3 O.sub.x melted with a hydrogen-oxygen torch, followed by lowering onto the edge of a spinning wheel. The fibers are up to 10 cm in length with the usual lateral dimensions, ranging from 20 .mu.m to 125 .mu.m. The fibers require a heat treatment to make them superconducting.
Book Synopsis Synthesis of Bi.sub. 1.8 Pb.sub.0.4 Sr.sub. 2 Ca.sub. 2 Cu.sub. 3 O.sub.x Superconductor by :
Download or read book Synthesis of Bi.sub. 1.8 Pb.sub.0.4 Sr.sub. 2 Ca.sub. 2 Cu.sub. 3 O.sub.x Superconductor written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-powder processes for the synthesis of superconducting (Bi, Pb)-2223/Ag-clad wires by the oxide-powder-in-the-robe are provided. The first precursor powder, of nominal stoichiometry CaCuO.sub.x, is a solution-synthesized mixture of Ca.sub.0.45 Cu.sub.0.55 O.sub. 2 and CaO. Using these oxide precursor mixtures, superconducting tapes with well-aligned grains and reproducible critical current densities J.sub.c in the range of 20,000 to 26,000 A/cm.sup. 2 at 75 K in self-field after annealing less than 200 hours were obtained.
Book Synopsis Method for Making High-critical-current-density YBa.sub. 2 Cu.sub. 3 O.sub. 7 Superconducting Layers on Metallic Substrates by :
Download or read book Method for Making High-critical-current-density YBa.sub. 2 Cu.sub. 3 O.sub. 7 Superconducting Layers on Metallic Substrates written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is disclosed for fabricating YBa.sub. 2 Cu.sub. 3 O.sub. 7 superconductor layers with the capability of carrying large superconducting currents on a metallic tape (substrate) supplied with a biaxially textured oxide buffer layer. The method represents a simplification of previously established techniques and provides processing requirements compatible with scale-up to long wire (tape) lengths and high processing speeds. This simplification has been realized by employing the BaF.sub. 2 method to grow a YBa.sub. 2 Cu.sub. 3 O.sub. 7 film on a metallic substrate having a biaxially textured oxide buffer layer.
Book Synopsis Fracture Toughness for Copper Oxide Superconductors by :
Download or read book Fracture Toughness for Copper Oxide Superconductors written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An oxide-based strengthening and toughening agent, such as tetragonal Zro.sub. 2 particles, has been added to copper oxide superconductors, such as superconducting YBa.sub. 2 Cu.sub. 3 O.sub.x (123) to improve its fracture toughness (K.sub. IC). A sol-gel coating which is non-reactive with the superconductor, such as Y.sub. 2 BaCuO.sub. 5 (211) on the ZrO.sub. 2 particles minimized the deleterious reactions between the superconductor and the toughening agent dispersed therethrough. Addition of 20 mole percent ZrO.sub. 2 coated with 211 yielded a 123 composite with a K.sub. IC of 4.5 MPa(m).sup.0.5.
Book Synopsis Preferentially Oriented, High Temperature Superconductors by Seeding and a Method for Their Preparation by :
Download or read book Preferentially Oriented, High Temperature Superconductors by Seeding and a Method for Their Preparation written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A multi-domained bulk REBa.sub. 2 Cu.sub. 3 O.sub.x with low-angle domain boundaries which resembles a quasi-single domained material and a method for producing the same comprising arranging multiple seeds, which can be small single crystals, single domained melt-textured REBa.sub. 2 Cu.sub. 3 O.sub.x pieces, textured substrates comprised of grains with low misorientation angles, or thick film REBa.sub. 2 Cu.sub. 3 O.sub.x deposited on such textured substrate, such seeds being tailored for various REBa.sub. 2 Cu.sub. 3 O.sub.x compounds, in specific pattern and relative seed orientations on a superconductor precursor material which may be placed in contact with a porous substrate so as to reduce the amount of liquid phase in the melt. Because seeds can be arranged in virtually any pattern, high quality REBa.sub. 2 Cu.sub. 3 O.sub.x elements of virtually unlimited size and complex geometry can be fabricated.
Book Synopsis Microstructure and Associated Properties of YBa[sub 2]Cu[sub 3]O[sub X] Superconductors Prepared by Melt-processing Techniques by :
Download or read book Microstructure and Associated Properties of YBa[sub 2]Cu[sub 3]O[sub X] Superconductors Prepared by Melt-processing Techniques written by and published by . This book was released on 1993 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the standpoint of applications, melt-processed bulk YBa[sub 2]Cu[sub 3]O[sub x] (YBCO) superconductors are of considerable interest. We have studied the microstructure and levitation force of melt-processed YBCO, YBCO plus Y[sub 2]BaCuO[sub 5], and YBCO plus Pt samples. Large single crystalline samples, grown using a seeding technique, were also studied. The levitation force is highest in melt-processed samples made by the seeding technique. 6 figs, 24 refs.
Book Synopsis Advances in Fabrication of Ag-clad Bi-2223 Superconductors by :
Download or read book Advances in Fabrication of Ag-clad Bi-2223 Superconductors written by and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powder-in-tube (PIT) processing was used to fabricate multifilamentary Ag-clad Bi2Sr2Ca2Cu3O{sub y} (Bi-2223) superconductors for various electric power applications. Enhancements in the transport current properties of long lengths of multifilament tapes were achieved by increasing the packing density of the precursor powder, improving the mechanical deformation, and adjusting the cooling rate. The dependence of the critical current density on magnetic field and temperature for the optimally processed tapes was measured. J{sub c} was greater than 104 (A/cm2) at 20 K for magnetic field up to 3 T and parallel to the c-axis which is of interest for use in refrigerator coded magnets. An attempt was made to combine the good alignment of Bi-2223 grains in Ag-sheathed superconducting tapes to obtain high J{sub c} values at high temperature and low field, and good intrinsic pinning of YBa2Cu3O{sub 7-d} (Y-123) thin film to maintain high J{sub c} values in high fields. A new composite multifilament tape was fabricated such that the central part contained Bi-2223 filaments, with the primary function of conducting the transport current. The central Bi-2223 filaments were surrounded by Y-123 thin film to shield the applied magnetic field and protect the Bi-2223 filaments. The J{sub c} values of the composite tape were better than those of an uncoated tape. In the case of 77 K applications, an I{sub c} of about 60 A was obtained in a 150 m long tape and zero applied magnetic field. In-situ strain characteristics of the mono- and multifilament tapes were conducted.
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