Tsukasa Taniguchi

Study of corrosion stability in metal particulate media

Metal particulate tape was prepared using stabilized metal particles, and the corrosion stability of the tape was examined under various environmental atmospheres. The decrease of magnetization after exposure to 60 degrees C/90% RH (relative humidity) for four weeks was bout 7%. When the tape was stored in a low concentration of pollutants of Cl/sub 2/, H/sub 2/S, and NO/sub 2/ gases, the change of magnetic properties was within about 0.6%. These stable characteristics show that the stabilized metal particulate tape is suitable for data-storage media. >

Development of large-current-carrying superconducting cable for AC use

Large-current-carrying superconducting cable with sub-micrometer NbTi filaments has been developed for the application of AC power devices such as superconducting rotating machines, SMES and fault current limiters. The quench current and the loss under AC operation have been measured. The results show that the superconducting cable has AC transport current of at least 2000 A/sub rms/ at 50 Hz in a 5T DC background magnetic field. The AC losses are measured to be 1.5/spl times/10/sup 3/ W/m/sup 3/ with 1000 A/sub rms/ transport current at 50 Hz, which are remarkably low.