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1. 发明专利

JPH10287423A PRODUCTION OF OXIDE SUPERCONDUCTOR, AND OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH10287423A
公开(公告)日：1998-10-27
申请号：JP8706297
申请日：1997-04-04
申请人： DOWA MINING CO , CHUBU ELECTRIC POWER
发明人： KOBAYASHI SHIYUUICHI , HASEYAMA HIDEETSU , YOSHIZAWA HIDEJI , NAGAYA SHIGEO
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , C30B29/22 , H01L39/00
摘要： PROBLEM TO BE SOLVED: To obtain an oxide superconductor having a large orientated superconducting crystal high in electrical characteristics and magnetic characteristics, by specifying the oxygen content in a raw material mixture containing rare earth metal compounds, Ba compounds and Cu compounds. SOLUTION: A raw material mixture containing RE compounds (RE is one or more rare earth metals containing Y), Ba and Cu compounds is heated, melted, quenched and solidified to give a raw material mixture having 15-20 wt.% oxygen content. The raw material mixture is ground and baked in a region at a temperature higher than the melting point of the raw material mixture to give an RE-Ba-Cu-O-based oxide superconductor comprising a finely dispersed an RE2 BaCuO5 phase in an REBa2 Cu3 O7-x phase, having >=0.1 T flux density to be caught in a stretch of 30 cm in any zone on the surface and 15-20 wt.% oxygen content. Consequently, an oxide superconductor capable of suppressing occurrence of crack, having a uniform projected magnetic flux density distribution, is obtained.

2. 发明专利

JPH1092234A OXIDE SUPERCONDUCTOR AND ITS MANUFACTURE 失效
公开(公告)号：JPH1092234A
公开(公告)日：1998-04-10
申请号：JP16432497
申请日：1997-06-20
申请人： DOWA MINING CO
发明人： YAMAGUCHI KAZUYA , KOBAYASHI SHIYUUICHI , HASEYAMA HIDEETSU , YOSHIZAWA HIDEJI
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , C30B29/22 , H01B12/00 , H01B13/00
摘要： PROBLEM TO BE SOLVED: To provide an oxide super-conductor exhibiting its uniform, high critical current density and a manufacturing method. SOLUTION: In this method, to a raw material mixture containing a RE compound (RE is a rare earth element containing Y), a Ba compound, and a Cu compound, processing including a burning process in a temperature region that is at least higher than fusing point is applied, and a RE-Ba-Cu-O based oxide super-conductor is manufactured. In this case, this method has a process for milling the above raw material mixture and making any one or two of the above materials of 50 to 100 micrometers in average particle size.

3. 发明专利

JPH04280856A PRODUCTION OF OXIDE SUPERCONDUCTING SINTERED COMPACT 失效
公开(公告)号：JPH04280856A
公开(公告)日：1992-10-06
申请号：JP12330191
申请日：1991-03-07
申请人： DOWA MINING CO
发明人： KOBAYASHI SHIYUUICHI , ISHIKAWA YUICHI
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , C04B35/64 , H01B12/00 , H01B13/00
摘要： PURPOSE:To prepare a large-sized R-based (R is at least one of rare earth elements) oxide superconducting sintered compact having a high density and critical current density. CONSTITUTION:The above-mentioned method is characterized as follows. Raw material powders are mixed at a prescribed ratio and the resultant mixed powder is then calcined at

4. 发明专利

JPH1053415A SILVER-CONTAINING OXIDE SUPERCONDUCTOR WITH EVEN CRYSTAL AZIMUTH AND ITS PRODUCTION 失效
公开(公告)号：JPH1053415A
公开(公告)日：1998-02-24
申请号：JP20505396
申请日：1996-08-02
申请人： DOWA MINING CO , CHUBU ELECTRIC POWER
发明人： KOBAYASHI SHIYUUICHI , HASEYAMA HIDEETSU , YOSHIZAWA HIDEJI , NAGAYA SHIGEO
IPC分类号： C01G1/00 , C01G3/00 , C04B35/45 , C04B35/653 , C30B9/00 , C30B29/22 , H01L39/12 , H01L39/24
摘要： PROBLEM TO BE SOLVED: To obtain the subject superconductor excellent in magnetic properties by incorporating a specified amount of silver into a phase of specific composition formula with the deviation of the azimuth between crystals adherent to each other over a specified range being a specified angle or smaller. SOLUTION: First, respective stock powders of Y2 O3 , BaCO3 and CuO are weighted so as to come to a specified composition ratio, the mixture is incorporated with 0.05-5wt.% of at least one kind among Pt, Pd, Ru, Rh, Ir, Os and Re, and the resultant mixed powder is preliminarily baked at a specified temperature, Secondly, the resultant powder is ground, then incorporated with Ag powder and further ground, and then subjected to pressure molding. Thirdly, the resultant molded form is baked in an atmosphere with an oxygen partial pressure Po2 of 2×10 to 1×10 atm and brought to a semi-molten state followed by temperature fall to effect crystallization. Subsequently, the crystallized molded form is put in an oven followed by reducing pressure in the oven to about 0.1Torr and then introducing O2 into the oven, raising the temperature in the oven to a specified level and then gradually cooling to room temperature, thus obtaining the objective oxide superconductor having such characteristics that RE2 BaCuO5 phase and 1-30wt.% of Ag powder are finely dispersed in REBa2 Cu3 O7-x phase (RE is rate earth metal including Y) and the deviation of the azimuth between crystals adjacent to each other over a range of 20mm×20mm×2mm or greater being ±5 deg..

5. 发明专利

JPH09306255A HIGH-DURABILITY OXIDE SUPERCONDUCTOR AND ITS MANUFACTURE 失效
公开(公告)号：JPH09306255A
公开(公告)日：1997-11-28
申请号：JP33221096
申请日：1996-12-12
申请人： DOWA MINING CO , CHUBU ELECTRIC POWER
发明人： KOBAYASHI SHIYUUICHI , NAGAYA SHIGEO , SHIMONOSONO TAKAAKI
IPC分类号： C01B13/14 , C01G1/00 , C23C14/00 , H01B12/02 , H01B13/00
摘要： PROBLEM TO BE SOLVED: To effectively prevent aged deterioration of an oxide superconductor by providing a multitude of protective cover layers. SOLUTION: An oxide superconductor 1 is covered with at least two or more metallic protective layers showing moisture resistance and airtightness. At least one or two kinds or more of metals selected from among Ti, V, Mn, Ni, Cu, Zn, Al, Zr, Nb, Ru, Rh, Pd, Ag, Sn, Ta, W, Re, Ir, Pt, Au, and Pb is put over the oxide superconductor 1 by 1 to 500μm as the first protective layer 2 that is in contact with the oxide superconductor 1. An alloy composed chiefly of one or two kinds or more of metals selected from among Pb, Sn, Ag, Ga, In, and Cd is put thereover as the second protective layer 3 as thick as about 0.1mm. Further, a protective film of a metal showing corrosion resistance, water-resistant polymeric paint, a thermosetting resin, or an ultraviolet-setting resin may be put thereover.

6. 发明专利

JPH05246713A 失效
公开(公告)号：JPH05246713A
公开(公告)日：1993-09-24
申请号：JP2829391
申请日：1991-02-22
申请人： DOWA MINING CO
发明人： ISHIKAWA YUICHI , KOBAYASHI SHIYUUICHI , YOSHIZAWA HIDEJI
IPC分类号： C01G1/00 , C01G3/02 , H01B12/00 , H01B13/00
摘要： PURPOSE:To provide an oxide superconductor bulk having a compsn. represented by a formula Re1Ba2Cu3Ox (where Re is a lanthanoid such as Y, Yb, Sm or Nd). CONSTITUTION:Powders of an Re-contg. compd., a Ba-contg. compd. and a Cu-contg. compd. as powdery starting materials are mixed in a prescribed ratio and compacted. The resulting compact is fired at 900-1,000 deg.C to partially form 123 phase (the phase of a substance having a compsn. represented by a formula Re1Ba2Cu3Ox) and the fired compact is further fired at 1,000-1,200'C to produce a high density body having 211 phase (the phase of a substance having a compsn. represented by a formula Re2Ba1Cu1Ox) as the principal phase. This high density body is crystallized by slow cooling. A high density relatively large-sized oxide superconductor bulk having 123 phase as principal phase and high critical current density can be provided by relatively simple processes.

7. 发明专利

JPH04310520A PRODUCTION OF HIGH DENSITY MATERIAL OF OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH04310520A
公开(公告)日：1992-11-02
申请号：JP10195791
申请日：1991-04-05
申请人： DOWA MINING CO
发明人： ISHIKAWA YUICHI , KOBAYASHI SHIYUUICHI
IPC分类号： C01G1/00 , C01G3/00 , C04B35/00 , C04B35/45 , C04B35/64 , H01B12/00 , H01B13/00
摘要： PURPOSE:To provide a method for producing an oxide superconductive bulk material having an Sm1Ba2Cu3O7-x phase as a main phase. capable of growing the Sm1Ba2Cu3O7-x phase having a large crystal particle diameter by a simple method. CONSTITUTION:Sm2O3 powder having an average particle diameter of 3mum. BaO having an average of 1mum and CuO powder having an average particle diameter of 1mum are mixed with each other, in an Sm:Ba:Cu ratio of 1.4:2.2:3.2, and the mixture is press-molded with a pressure of 2t/cm to produce pellets each having a diameter of 12 inch and a thickness of 1cm. The pellets are heated at a rate of 20 deg.C/min, held at 1200 deg.C for 40min, cooled at a rate of 1 deg.C/min, cooled at a rate of 0.5 deg.C/h when cooled to 1100 deg.C, cooled at a rate of 10 deg.C/h when cooled to 960 deg.C, and further cooled to the ordinary temperature for proceeding an inclusion reaction, thus growing the objective Sm1Ba2Cu3O7-x phase.

8. 发明专利

JPH11180765A OXIDE SUPERCONDUCTOR CONTAINING SILVER AND ITS PRODUCTION 失效
公开(公告)号：JPH11180765A
公开(公告)日：1999-07-06
申请号：JP35139197
申请日：1997-12-19
申请人： DOWA MINING CO , CHUBU ELECTRIC POWER
发明人： KOBAYASHI SHIYUUICHI , HASEYAMA HIDEETSU , SATO MAMORU , NAGAYA SHIGEO
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , H01L39/00
摘要： PROBLEM TO BE SOLVED: To improve electromagnetic characteristics in air by adding a silver- contg. compd. to a source mixture of specified compds., melting the mixture in air at a temp. higher than the temp. to cause partial melting, keeping the mixture at a specified temp. or slowly cooling. SOLUTION: A source material mixture containing a RE compd. (RE is a rare earth metal element including Y), a Ba compd. and a Cu compd. is mixed with Al metal or an Al compd. by 1 to 60 wt.% (calculated as the weight of only Al element) and molten at a temp. higher than the temp. to cause partial melting in an atmosphere of 2×10 to 1 atm oxygen partial pressure P0 . Then the mixture is cooled to room temp. or if necessary kept at a specified temp. and slowly cooled to obtain an oxide superconductor having a phase of RE2(1-q) Ba1+r CuO5+s or a phase of RE4(1-q) Ba2(1+r) Cu2 O2(5+s) in a phase of RE1+x Ba2+y Cu3 Od phase. In the formulae, x, y, d satisfy -0.3

9. 发明专利

JPH1111943A OXIDE SUPERCONDUCTOR AND ITS PRODUCTION 失效
公开(公告)号：JPH1111943A
公开(公告)日：1999-01-19
申请号：JP16124297
申请日：1997-06-18
申请人： DOWA MINING CO
发明人： KOBAYASHI SHIYUUICHI , HASEYAMA HIDEETSU , SATO MAMORU
IPC分类号： C04B35/45 , C01G1/00 , C01G3/00 , H01L39/00
摘要： PROBLEM TO BE SOLVED: To obtain an oxide superconductor having a high critical current density even in a high magnetic field by incorporating a specified amt. of a specified element (compd.) into an RE-Ba-Cu-O superconductor. SOLUTION: The oxide superconductor contains 0.05-1 wt. % one or more among Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Sr, Zr, Nb, Mo, Tc, In, Sn, Sb, Tc, Cs, La, Ce, Pt, Nd, Hf, Ta, W and Bi in an oxide superconductor contg. an RE2 BaCuO5 phase (RE is Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu) finely dispersed in an REBa2 Cu3 O7-x phase. It may contain 0.05-5 wt.% one or more among Pt, Pd, Ru, Rh, Ir, Os and Re (compds.) or may further contain 1-30 wt.% Ag. The objective oxide superconductor is obtd. by adding such elements (compds.) at the time of producing the RE-Ba-Cu oxide superconductor by a melting method.

10. 发明专利

JPH08133725A OXIDE SUPERCONDUCTOR AND ITS PRODUCTION 失效
公开(公告)号：JPH08133725A
公开(公告)日：1996-05-28
申请号：JP26690594
申请日：1994-10-31
申请人： DOWA MINING CO , CHUBU ELECTRIC POWER
发明人： KOBAYASHI SHIYUUICHI , YOSHIZAWA HIDEJI , NAGAYA SHIGEO , HIRANO NAOKI
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , H01B12/00 , H01B13/00
摘要： PURPOSE: To produce an oxide superconductor having high critical current density and excellent in magnetic repulsion. CONSTITUTION: This oxide superconductor contains RE2 Ba1 Cu1 O5 (RE is rare earth elements including Y) phase (211 phase) of 0.1-2.0μm average particle diameter finely dispersed in RE1 Ba2 Cu3 O7-x phase (123 phase). This superconductor is produced as follows: a starting material mixture is heated to a temp. at which 211 phase and a liq. phase exist, the resultant mixed phase is cooled at 5-30 deg.C/min rate while forming 5-50 deg.C/cm temp. gradient in the mixed phase until a temp. above a temp. at which 123 phase begins to crystallize on the low temp. side by 5-40 deg.C is attained and then the mixed phase is slowly cooled at 0.1-2 deg.C/hr rate.

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