Microstructures and Superconducting Properties of Y-Ba-Cu Oxide Coils Prepared by the Explosive Compaction Technique
Explosive compaction technique possesses considerable potential as a means of densifying metal, ceramics and mixtures of these powders. We applied this technique to preparation of silver sheathed coils of Y-Ba-Cu superconducting oxide. The coils to be compacted were placed into metal tube and the tube was filled with SiC powder as a pressure propagating medium and the tube was explosively compacted by a cylindrically axi-symmetric method. The coils explosively compacted were then sintered, and microstructure observations and superconducting property measurements were made. The oxide core was seen to be very dense, and a part of a Y-Ba-Cu oxide coil had a critical current density higher than 13,000A/cm2 at 77K. This results show that the explosive compaction technique will be an effective means to prepare coils with excellent superconducting properties.
KeywordsCritical Current Density Liquid Nitrogen Temperature Longitudinal Cross Section Oxide Core Explosive Compaction
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- K. Takashima, H.Tonda, M.Ueno, T.Toraishi and M.Miyano : J. Iron & Steel Inst. 73 (1987) 2219.Google Scholar