Second-generation Hts Conductors

by Goyal, Amit

• ISBN13: 9781402081170
• ISBN10: 1402081170
• Format: Hardcover
• Copyright: 2004-10-31
• Publisher: Kluwer Academic Pub

Summary

The discovery of high temperature superconductors (HTS) in 1986 by two IBM scientists led to an unprecedented explosion of research and development efforts world-wide because of the significant potential for practical applications offered by these materials. However, the early euphoria created by the exciting prospects was dampened by the daunting task of fabricating these materials into useful forms with acceptable superconducting properties. Progress towards this goal has been hindered by many intrinsic materials problems, such as weak-links, flux-creep, and poor mechanical properties. The above problems led to the development of the Second-Generation of HTS wires. Three methods were invented to produce flexible metallic substrates, which were also crystallographically biaxially textured, and resembled a long, mosaic single crystal. The first method invented is the Ion-Beam-Assisted-Deposition (IBAD). The second method developed was the Inclined-Substrate-Deposition (ISD). The third method invented is called the Rolling-assisted-biaxially-textured-substrates (RABiTS). The book is divided into four sections. The first section discusses the three methods to fabricate biaxially textured substrates, upon which, epitaxial YBCO or other HTS materials can be deposited to realize a single-crystal-like HTS wire. The second section includes chapters on various methods of HTS deposition such as pulsed laser ablation (PLD), thermal co-evaporation, sputtering, pulsed electron beam deposition, ex-situ BaF2 by co-evaporation flowed by annealing, chemical solution based ex-situ processes, jet vapor deposition, metal organic chemical vapor deposition (MOCVD), and liquid phase epitaxy (LPE). The third section includes detailed chapters on other HTS materials such as the various Tl-based and Hg-based conductors. These Second-Generation HTS conductors, also referred to as "Coated conductors" represent one of the most exciting developments in HTS technology. HTS wires based on this technology have the potential to carry 100-1000 times the current without resistance losses of comparable copper wire. HTS power equipment based on these HTS conductors has a potential to be half the size of conventional alternatives with the same or higher power rating and less than one half the energy losses. Upgrading of the world-wide electric power transmission and distribution with HTS based devices can significantly help in meeting the growing demand for electricity world-wide. There is little question that superconducting technology based on the Next-Generation HTS Superconducting Wires will make a substantial impact on the way we generate, transmit, distribute and use electric power. Of course the question is - how soon?

Table of Contents

IBAD template films for HTS coated conductors	p. 3
Epitaxial superconductors on rolling-assisted-biaxially-textured-substrates (RABiTS)	p. 29
Inclined substrate deposition	p. 47
ISD by thermal evaporation	p. 53
Pulsed laser deposition of YBa[subscript 2]Cu[subscript 3]O[subscript 7-[delta]] for coated conductor applications : current status and cost issues	p. 59
Methods of HTS deposition : thermal evaporation	p. 81
Sputtering of Y[subscript 1]Ba[subscript 2]Cu[subscript 3]O[subscript 7-[delta]]	p. 97
Pulsed electron-beam deposition of high temperature superconducting films for coated conductor applications	p. 109
BaF[subscript 2] post-deposition reaction process for thick YBCO films	p. 135
Issues and progress related to the continuous ex-situ BaF[subscript 2] processing of long-length YBCO coated conductors	p. 149
Solution deposition of YBa[subscript 2]Cu[subscript 3]O[subscript 7-[delta]] coated conductors	p. 179
Non-fluorine based bulk solution techniques to grow superconducting YBa[subscript 2]Cu[subscript 3]O[subscript 7-[delta]] films	p. 195
Jet vapor deposition for continuous, low cost manufacture of high temperature superconducting tape	p. 215
Processing of long-length tapes of high-temperature superconductors by combustion chemical vapor deposition	p. 233
MOCVD growth of YBCO films for coated conductor applications	p. 245
LPE processing for coated conductor	p. 261
Ex-situ processing of tl-containing films	p. 275
Epitaxy of Hg-based high-T[subscript c] superconducting thin films	p. 317
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