公开(公告)号：JP2001093728A

公开(公告)日：2001-04-06

申请号：JP27119599

申请日：1999-09-24

Applicant: RAILWAY TECHNICAL RES INST ,  INT SUPERCONDUCTIVITY TECH ,  HOKURIKU ELECTRIC POWER

Inventor： NAGASHIMA MASARU ,  MURAKAMI MASAHITO ,  MIYAMOTO TAKESHI ,  KOBAYASHI ATSUSHI ,  TSUKAMOTO OSAMI

IPC: H01F13/00 ,  H01F6/00 ,  H02K15/03

Abstract: PROBLEM TO BE SOLVED: To obtain a method for easily magnetizing a 'superconducting magnet assembly', composed of bulk superconducting magnets having magnetic poles alternated, so that a magnetic field gradient is generated, easily at low cost. SOLUTION: After adjacent bulk superconducting magnet materials are put one over the other by a hinge, etc., as shown in Fig. 1 and connected to that they are freely open, the respective bulk superconducting magnet materials are all put one over another and magnetized in this state, and the bulk superconducting magnetic materials stack bodies having been magnetized are alternately opened and extended in parallel. In this case, the bulk superconducting magnet materials are magnetized, so that their stacked surfaces do not make contact with each other but are half-opened at an angle, so that it is easier to open the magnets after they have been magnetized.

公开(公告)号：JP2001064016A

公开(公告)日：2001-03-13

申请号：JP23847799

申请日：1999-08-25

Applicant: INT SUPERCONDUCTIVITY TECH ,  RAILWAY TECHNICAL RES INST

Inventor： TOMITA MASARU ,  MURAKAMI MASAHITO

IPC: C01G3/00 ,  C01G1/00 ,  H01L39/12 ,  H01L39/24

Abstract: PROBLEM TO BE SOLVED: To provide an oxide superconductor sufficiently durable against large electromagnetic force, external force and internal stress such as thermal distortion accompanied by rapid heating/cooling in the case of its use and stably exhibiting a highly captive magnetic field over a long period of time. SOLUTION: The oxide superconductor such as a copper oxide superconductor containing a rare earth element is constituted of an oxide super-conductive bulk body impregnated with a low-melting point metal or an oxide super- conductive bulk body impregnated with the low-melting point metal and having a thin layer of the low-melting point metal on the outer surface. These oxide superconductors can be produced by bringing the oxide super-conductive bulk bodies kept in a pressure-reduced atmosphere into contact with the low-melting point metal of the melting state. When pores are preliminarily prepared on the oxide super-conductive bulk body so that both of the outer surface of the oxide super-conductive bulk body and the internal surfaces of the pores are used as the contact surfaces with the low-melting point metal, the production efficiency and the product property can be expectantly enhanced furthermore.

公开(公告)号：JP2000016811A

公开(公告)日：2000-01-18

申请号：JP18662998

申请日：1998-07-01

Applicant: INT SUPERCONDUCTIVITY TECH ,  IWATE PREFECTURE

Inventor： MIRIYARA MURARIDA ,  MURAKAMI MASAHITO ,  SEGAWA KOJI ,  KAMATA KOICHI ,  SAITO TAKASHI

IPC: C01G1/00 ,  C01G3/00 ,  C30B29/22 ,  H01B12/00 ,  H01B13/00 ,  H01L39/12

Abstract: PROBLEM TO BE SOLVED: To obtain an RE-Ba-Cu-O oxide bulk superconductor capable of attaining a sufficiently high critical current density at a relatively high temperature. SOLUTION: This RE-Ba-Cu-O oxide bulk superconductor comprises an RE site composed of a combination of two or more kinds of La, Nd, Sm, Eu and Gd in which at least one kind of them is La, Nd and Sm and the residue contains at least one kind of Eu and Gd. The parent phase is composed of RE1+xBa2-xCu3Oy (-0.1 =10,000 A/cm2 under conditions of parallel application of a magnetic field of 3T to the c-axis of crystal.

公开(公告)号：JP2000178025A

公开(公告)日：2000-06-27

申请号：JP36172298

申请日：1998-12-18

Applicant: INT SUPERCONDUCTIVITY TECH ,  RAILWAY TECHNICAL RES INST

Inventor： TOMITA MASARU ,  MURAKAMI MASAHITO

IPC: H01F7/00 ,  C01G1/00 ,  C01G3/00 ,  C04B41/83 ,  H01L39/24

Abstract: PROBLEM TO BE SOLVED: To provide a superconductor capable of securing high trapped magnetic field strength and maintaining the performance over a long period without being affected by internal or external force such as electromagnetic force or thermal strain, or corrosive environment and to provide at production process for the superconductor. SOLUTION: This superconductor consists of an oxide superconducting bulky body (such as rare earth element-based copper oxide superconducting bulky body) having a resin-impregnated layer, as illustrated in the figure, wherein optionally, an adequate amount of Ag may be added to the bulky body. The superconductor is formed by bringing an oxide superconducting bulky body maintained in a reduced-pressure atmosphere into contact with a liquid resin, to impregnate the bulky body with the liquid resin.

公开(公告)号：JP2000053419A

公开(公告)日：2000-02-22

申请号：JP22251898

申请日：1998-08-06

Applicant: INT SUPERCONDUCTIVITY TECH ,  RAILWAY TECHNICAL RES INST ,  TOKYO GAS CO LTD

Inventor： TSUKUMOTO TOMOKO ,  MURAKAMI MASAHITO ,  NAGASHIMA MASARU ,  MOCHIDA TADASHI ,  WOLFGANG NOWACK ,  FRANZ ZAUAZOV ,  HARALD WEBER

IPC: C01G1/00 ,  C01G3/00 ,  H01B13/00 ,  H01L39/12 ,  H01L39/24

Abstract: PROBLEM TO BE SOLVED: To stably supply an RE-Ba-Cu-O bulky superconductor capable of attaining high electromagnetic force at a relatively high temp. SOLUTION: An RE-Ba-Cu-O bulky superconductor (RE is La, Nd, Sm, Eu, Gd, Y, Ho or Dy) is irradiated with neutrons to disperse and incorporate 5-50% 'amorphous phase' having 10-500 nm particle diameter or 5-50% 'recrystallized phase different from parent phase in crystal orientation' in the parent phase of the superconductor. A more favorable result is obtained when the bulky superconductor in which an RE1+xBa2-xCu3O2 crystal phase different from the parent phase in the concn. of oxygen is dispersed in the parent phase, is irradiated with neutrons. The parent phase may contain the dispersed phase of RE2 BaCuO5 crystals or RE4+2dBa2+2dCu2-dOg crystals (0.2