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1. 发明专利

JPH06206799A PRODUCTION OF OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH06206799A
公开(公告)日：1994-07-26
申请号：JP24530392
申请日：1992-09-14
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , NIPPON STEEL CORP , TOSOH CORP , SHIKOKU ELEC POWER , KAWASAKI HEAVY IND LTD , HOKURIKU ELECTRIC POWER , KAWASAKI STEEL CO , RAILWAY TECHNICAL RES INST
发明人： MURAKAMI MASAHITO , SAKAI NAOMICHI , TAKAICHI HIROSHI , KONDO AKIHIRO , KAGITANI SHOICHI , NAKAMURA NAOMICHI , FUJIMOTO HIROYUKI , KOSHIZUKA NAOKI , TANAKA SHOJI
IPC分类号： C01G1/00 , C01G3/00 , C30B11/00 , C30B29/22 , H01B12/00 , H01B13/00 , H01L39/24
摘要： PURPOSE:To provide a method for producing a practically applicable large-size oxide superconductor by controlling the direction of the crystal. CONSTITUTION:In a process for coagulation of a semi-fused Y type superconductor having a composition of Y:Ba:Cu=(1.0 to 2.0):(2.0 to 2.5):(3.0 to 3.5), crystal growth is carried out under a condition where two travel speeds of the crystal growth temperature zone in mutually perpendicular directions are different. A large-size oxide super conductor obtained by this process enables improvement of the floating force and, therefore, remarkable improvement of the performance of the apparatus.

2. 发明专利

JPH07232917A OXIDE SUPERCONDUCTOR AND ITS PRODUCTION 失效
公开(公告)号：JPH07232917A
公开(公告)日：1995-09-05
申请号：JP2149294
申请日：1994-02-18
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , RAILWAY TECHNICAL RES INST , SHIKOKU ELEC POWER , TOSOH CORP
发明人： MURAKAMI MASAHITO , YUU SANGU IMU , SAKAI NAOMICHI , TAKAICHI HIROSHI , HIGUCHI AMAMITSU , TANAKA SHOJI
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , C04B35/653 , H01B12/00 , H01B13/00
摘要： PURPOSE:To increase critical temp. and critical current by specifying the partial pressure of oxygen in an atmosphere used at the time of forming a superconducting phase from a molten state by solidification. CONSTITUTION:Oxide of RE (RE is one or more kinds of elements selected from among La, Nd, Sm, Eu and Gd) is mixed with BaCO3, and CuO, this mixture is melted by heating to 1,000-1,300 deg.C and a phase represented by the formula (RE1-xBax)(Ba1-yREy)Cu3Od (where 0

3. 发明专利

JPH07187671A OXIDE SUPERCONDUCTOR AND ITS PRODUCTION 失效
公开(公告)号：JPH07187671A
公开(公告)日：1995-07-25
申请号：JP33388693
申请日：1993-12-27
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , RAILWAY TECHNICAL RES INST , SHIKOKU ELEC POWER , TOSOH CORP
发明人： MURAKAMI MASAHITO , YUU SANGU IMU , SAKAI NAOMICHI , TAKAICHI HIROSHI , HIGUCHI AMAMITSU , TANAKA SHOJI
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , C04B35/653 , H01B12/00 , H01B13/00
摘要： PURPOSE:To suppress a mutual substitution of RE and Ba and to produce the superconductor having >=90K critical temp. in a RE-Ba-Cu-O series (RE is La, Nd or Sm.) superconductor. CONSTITUTION:The superconductor is composed of a composition of Re-Ba-Cu-O (RE is at least one element among rare earth elements of La, Nd and Sm.) and has the following structure. That is, a composition in which a ratio of RE:Ba:Cu is 1:2:3 and the ratio of O is 6.8-7.2 is used as a basal phase, and a dispersed phase in which the ratio of RE:Ba:Cu is (1+d):(2-d):3 (0 =1% and =0.00001atm and

4. 发明专利

JPH111320A OXIDE SUPERCONDUCTOR AND ITS PRODUCTION 失效
公开(公告)号：JPH111320A
公开(公告)日：1999-01-06
申请号：JP15191697
申请日：1997-06-10
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , HOKURIKU ELECTRIC POWER , RAILWAY TECHNICAL RES INST
发明人： GOTOU SHINGO , SAKAI NAOMICHI , RIYUU SOUNIN , MURAKAMI MASAHITO
IPC分类号： C04B35/653 , C01G1/00 , C01G3/00 , H01L39/12
摘要： PROBLEM TO BE SOLVED: To provide an oxide superconductor having excellent properties and large crystal particles in a La123-system oxide superconductor, and a method for producing the superconductor. SOLUTION: This oxide superconductor having excellent properties and large crystal granules comprises La-Ba-Cu-O containing La1+x Ba2-x Cu3 O(7+x/2-d) -0.1

5. 发明专利

JPH1087328A METHOD FOR ANNEALING BULK SUPERCONDUCTOR WITH OXYGEN 失效
公开(公告)号：JPH1087328A
公开(公告)日：1998-04-07
申请号：JP24018196
申请日：1996-09-11
申请人： KAWASAKI STEEL CO , KOKUSAI CHODENDO SANGYO GIJUTS , RAILWAY TECHNICAL RES INST
发明人： SAKAI NAOMICHI , TAKAHASHI MIKIO , NAGASHIMA MASARU , MURAKAMI MASAHITO
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , H01B13/00 , H01L39/24
摘要： PROBLEM TO BE SOLVED: To rapidly and satisfactorily introduce oxygen into an RE-Ba-Cu-O type bulk oxide and to impart satisfactory superconducting characteristics even to the bulk oxide by previously piercing pores in the interior of the bulk oxide. SOLUTION: When oxygen is introduced into a melted and grown REBa2 Cu3 Oy type bulk oxide (RE is preferably one or more kinds of La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er and Yb) to form a superconductor by oxygen annealing, the specific surface area of the bulk oxide is previously increased by piercing pores in the interior of the bulk oxide. The pores are preferably pierced in a direction perpendicular to the ab face of each 1.2.3 type crystal. The pref. diameter of the pores is 0.01-2.0mm and the pref, volume of the pores in the bulk oxide is 0.1-20%.

6. 发明专利

JPH0782049A JUNCTION OF Y BASED OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH0782049A
公开(公告)日：1995-03-28
申请号：JP25498493
申请日：1993-09-17
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , SHIKOKU ELEC POWER , TOSOH CORP
发明人： MURAKAMI MASAHITO , TAKAICHI HIROSHI , SAKAI NAOMICHI
IPC分类号： C01G1/00 , C01G3/00 , C04B35/45 , C04B37/00 , H01L39/02 , H01R4/68
摘要： PURPOSE:To relate to the junction method of Y oxide superconductors prepared through the melting process. CONSTITUTION:When two Y based oxide conductors prepared by a melting process are connected to each other under pressure, a component which is apt to cause high temperature creep at the junction temperature or becomes liquid such as an REBa2Cu3O7-delta (RE=Y, Ho, Er, Tm or Yb), Ag, BaCuO2-CuO is placed between the superconductors. Thus, connected semiconductors low in deterioration in superconductivity at the connected part can be readily prepared.

7. 发明专利

JPH07206405A OXIDE SUPERCONDUCTOR PRODUCING APPARATUS 失效
公开(公告)号：JPH07206405A
公开(公告)日：1995-08-08
申请号：JP35422693
申请日：1993-12-31
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , MATERUZU KK , SHIKOKU ELEC POWER , TOSOH CORP
发明人： SAKAI NAOMICHI , TAKAICHI HIROSHI , MURAKAMI MASAHITO , GOTO HIROHITO , YOSHIOKA HIROSHI
IPC分类号： C01B13/14 , C01G1/00 , C01G3/00 , C30B1/06 , H01B13/00
摘要： PURPOSE:To provide a device capable of inexpensively producing oxide superconductor crystal having high characteristics and stable quality in a large amt. CONSTITUTION:This oxide superconductor producing apparatus consists of a horizontal type electric furnace internally arranged with a furnace core tube (10) and a heating device having a sample driving mechanism for moving the oxide superconductor moldings arranged within the furnace core tube in the longitudinal direction of the furnace core tube. The heating section of this horizontal type electric furnace has plural pieces of heating element sections (2, 6, 8, 15, 17) respectively divided in the longitudinal direction and vertical direction. The respective heating element sections have control sections capable of independently controlling temps. Further, the apparatus is provided with high load density type heating elements (4, 12) at one end of at least a part of the heating element sections facing each other above and below so that rapid temp. gradients are formed in the two directions; the longitudinal direction and the vertical direction. The heating sections are longitudinally divided to >=2 pieces to provide the mechanisms capable of varying the spacings between the respective heating sections. The max. steep tap. gradients are obtd. if the one-side end parts of the heating sections on the high-tap. side among the heating sections divided to >=2 pieces are provided with the high load density type heating elements above and below these parts and cooling structures using air or water as a refrigerant are located between the divided heating sections.

8. 发明专利

JPH07111213A COMPOSITE BODY OF HIGH-TEMPERATURE SUPERCONDUCTING BULK BODY AND COIL MAGNET 失效
公开(公告)号：JPH07111213A
公开(公告)日：1995-04-25
申请号：JP28012693
申请日：1993-10-13
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , SHIKOKU ELEC POWER , TOSOH CORP
发明人： MURAKAMI MASAHITO , TAKAICHI HIROSHI , TANAKA SHOJI , SAKAI NAOMICHI
IPC分类号： H01B13/00 , H01F6/00 , H01F6/06
摘要： PURPOSE:To easily control a generated magnetic field by providing a composite magnet composed of a core made of an R-Ba-Cu-O bulk superconducting material manufactured by a melting method and a normal conducting or superconducting coil surrounding the core. CONSTITUTION:A superconducting bulk body 1 is obtained from an R-Ba-Cu-O superconducting material, with the R being composed of one or more tare-earth elements selected from among Y, Sm, Eu, Gd, Dy, Ho, and Er by using a melting method. A composite magnet is formed by winding a superconducting copper coil 2a which can make an electric current of 10A in maximum to flow around the bulk body 1 by 100 turns. When an electric current of 5A is made to flow to the coil 2a, a 1-kG magnetic field is generated at the central part of the bulk body 1 and, when an electric current is made to flow in the opposite direction, the magnetic field of the bulk body 1 gradually becomes weaker and the outer periphery of the magnetic field becomes zero at 5A. Therefore, the magnetic field of the bulk body 1 can be changed.

9. 发明专利

JPH09255335A PRODUCTION OF BULK-OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH09255335A
公开(公告)日：1997-09-30
申请号：JP6598196
申请日：1996-03-22
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , TOKYO GAS CO LTD , RAILWAY TECHNICAL RES INST
发明人： MOCHIDA TADASHI , RIYUU SOUNIN , SAKAI NAOMICHI , MURAKAMI MASAHITO
IPC分类号： C01G1/00 , C01G3/00 , C30B29/22 , H01B12/00 , H01B13/00
摘要： PROBLEM TO BE SOLVED: To obtain an oxide superconductor having satisfactory superconducting characteristics by using an atmosphere of oxygen as an atmosphere at the time of growing a crystal when an RE-Ba-Cu-O bulky superconductor is produced by a half melting method. SOLUTION: An atmosphere of oxygen is used as an atmosphere at the time of growing a crystal of REBa2 Cu3 O7-x [(x) is the deficiency of oxygen and is 0-0.5 and RE is lanthanoids including Y] when an REBa2 Cu3 O7-x bulk superconductor is produced by a half melting method (melt processing method). A powdery material mixture is heated to 1,010-1,050 deg.C to form RE2 BaCuO5 and a liq. phase and then slow cooling to 1,000-930 deg.C is carried out at 0.1-10 deg.C/hr cooling rate.

10. 发明专利

JPH09255333A OXIDE SUPERCONDUCTING COMBINED BODY AND ITS PRODUCTION 失效
公开(公告)号：JPH09255333A
公开(公告)日：1997-09-30
申请号：JP6559696
申请日：1996-03-22
申请人： KOKUSAI CHODENDO SANGYO GIJUTS , RAILWAY TECHNICAL RES INST
发明人： NAGASHIMA MASARU , SAKAI NAOMICHI , RIYUU SOUNIN , FUJIMOTO HIROYUKI , MURAKAMI MASAHITO
IPC分类号： C01G1/00 , C01G3/00 , H01B12/00 , H01B13/00 , H01L39/00 , H01L39/14
摘要： PROBLEM TO BE SOLVED: To provide a technique capable of generating a strong magnetic field. SOLUTION: This combined body consists of two or more kinds of RE-Ba-Cu- O (RE is a rare earth element) superconducting bulky bodies capturing a magnetic field in the pinning centers in the bulky bodies. The peripheral part of this combined body is formed with a superconducting bulky body 1 having high critical current density in a low magnetic field as one of the RE-Ba-Cu-O superconducting bodies and the central part is formed with a superconducting bulky body 2 having high critical current density in a high magnetic field as the other.

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