Oxide superconducting current lead and manufacture thereof



PURPOSE: To obtain a current lead which is suppressed in cracking and has a high critical current density by providing a plurality of intermediate layers in which the mixing ratio of an oxide superconductor and a metal is adjusted so that their coefficients of thermal expansion can be increased in steps and baking the intermediate layers. CONSTITUTION: A green sheet (a) is prepared by mixing 6g of polyvinyl butyral resin, 3g of phthalic ester, and 45g of butanol in 100g of oxide superconductor powder and, on the other hand, mixed green sheets (b), (c), (d) and (f) are prepared by using the oxide superconductor powder and sliver powder. Then a sliver green sheet (g) is prepared by using similar silver powder and the green sheet layer 1 of an oxide conductor provided with recessed sections 5 at its end sections is prepared by partially cutting off the end sections of the sheet (a). Then, after the green sheets (b), (c), (d), (f), and (g) are successively piled up on both surfaces of the sections 5, an oxide superconductor layer 2, metal-superconductor mixed layer 3, and metallic layer 4 are formed by repeatedly pressing, heat-treating for 10 hours at 940°C, and cooling the piled-up green sheets. The current lead thus obtained has a high critical current density and does not crack. COPYRIGHT: (C)1993,JPO&Japio
(57)【要約】 【目的】 酸化物超電導体と金属との界面や酸化物超電 導体にみられたクラックの発生、はく離等を回避し、臨 界電流密度の高い酸化物超電導電流リードを提供する。 【構成】 酸化物超電導体グリーンシート層1の端部表 面に、酸化物超電導体の含有率を段階的に減少させた複 数枚の酸化物超電導体粒子と金属粒子との混合グリーン シートを酸化物超電導体の含有率が少ないものが外層側 になるように順次積層し、ついで最外層に金属グリーン シートを積層して一体化した後、加圧中又は加圧後金属 粒子及び/又は酸化物超電導体粒子が部分溶融する温度 領域で焼成する




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    Publication numberPublication dateAssigneeTitle
    JP-2008053722-AMarch 06, 2008Nexans, ネクサンクエンチ制御された高温超伝導体
    JP-H0964423-AMarch 07, 1997Agency Of Ind Science & Technol, 工業技術院長酸化物超電導体/高強度セラミックス積層化電流リード
    US-5429791-AJuly 04, 1995Korea Atomic Energy Research Institute, Korea Electric Power CorporationSilver-high temperature superconductor composite material manufactured based on powder method, and manufacturing method therefor