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174 results on '"Kawagishi K"'

3. A New Approach for the Fabrication of MgB2 Superconducting Tape with Large In-field Transport Critical Current Density

Author

Komori, K., Kawagishi, K., Takano, Y., Fujii, H., Arisawa, S., Kumakura, H., Fukutomi, M., and Togano, K.

Subjects
Condensed Matter - Superconductivity
Abstract

The paper reports the first successful fabrication of MgB2 superconducting tape using a flexible metallic substrate as well as its strong pinning force, which was verified by direct measurement of transport critical current density. The tape was prepared by depositing MgB2 film on a Hastelloy tape buffered with an YSZ layer. The Jc of the tape exceeds 105A/cm2 at 4.2K and 10T, which is considered as a common benchmark for magnet application. The Jc dependence on magnetic field remains surprisingly very small up to 10T, suggesting that the tape has much better magnetic field characteristic than conventional Nb-Ti wires in liquid helium., Comment: 3 page PDF file

Published
2002
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28. An investigation of the compatibility of nickel-based single crystal superalloys with thermal barrier coating systems

Author

Wu, RT, Kawagishi, K, Harada, H, and Reed, RC

Abstract

The compatibility of a number of nickel-based single crystal superalloys with a thermal barrier coating (TBC) system is examined. An industry-standard yttria-stabilised zirconia (YSZ)-type ceramic was used throughout this work, deposited using electron beam physical vapour deposition at a commercial facility. It is demonstrated that the resistance to spallation during thermal cycling is dependent upon the composition of the superalloy substrate upon which the TBC system is placed - the number of cycles to failure is found to vary by up to a factor of three when identical TBC systems (bond coat, ceramic layer) are employed. Of the three different bond coat systems considered, a platinum-diffused (so-called low-cost bond coat) was found to be consistently better than both low-activity or high-activity platinum aluminide bond coats, but only marginally. The composition of the superalloy substrate is thus shown to be the primary factor in determining TBC life.

Published
2016

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