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公开(公告)号：JPS6410525A
公开(公告)日：1989-01-13
申请号：JP16587987
申请日：1987-07-02
Applicant: TOSHIBA CORP
Inventor： NAKAYAMA SHIGEO , YAMADA MINORU , MURASE AKIRA , FUKUSHIMA EIJI
Abstract: PURPOSE:To form a wire rod with the high critical temperature and high critical current density at a low cost by storing a mixture of multiple kinds containing the elements capable of synthesizing an oxide compound superconductor in a coated tube with the double-tube structure of a copper net on the inside and silver on the outside, linearly face-reduction-machining it, and heat-treating it in the oxygen gas atmosphere. CONSTITUTION:Y2O3 powder, BaCO3 powder, and CuO powder are mixed with the mol ratio of 0.5:2.0:3.0 into a powder mixture 1, which is temporarily baked for 2hr at 900 deg.C in the air then crushed and further pulverized with a ball mill. It is stored in a coated tube 4 with the double-tube structure constituted of a silver tube 2 with the outer diameter of 14mm, inner diameter of 13mm, and length of 70mm and a copper net tube 3 with the outer diameter of 12.8mm, inner diameter of 11.0mm, and length of 70mm located on its inside, both end openings are sealed and drawing-machined to form a wire rod 5 with the diameter of about 0.5mm. The whole thickness of the coating material 6 of this wire rod 5 is 200mum, 10mum of which is a silver layer 7 and the remaining portion is a copper layer 8. The heat treatment is then applied for 24hr at 900 deg.C in the oxygen gas.
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公开(公告)号：JPS63292531A
公开(公告)日：1988-11-29
申请号：JP12881387
申请日：1987-05-26
Applicant: TOSHIBA CORP
Inventor： YAMADA MINORU , NAKAYAMA SHIGEO , MURASE AKIRA , NAKAMURA SUGURU , SASAKI MITSUO
Abstract: PURPOSE:To provide a wire with high critical amperage density by forming an oxide layer on the base in close contact, wherein the oxide layer serves as a mother material for compound superconductive body of oxide type, irradiating laser beam thereon, and melting and solidifying this oxide layer. CONSTITUTION:An oxide layer 4 as mother material for compound superconductive body of oxide type is formed on the base 2 in such a way as closely contacted, and laser beam 6 is irradiated onto this formed oxide layer 4 to cause melting and solidification of the oxide layer 4. The oxide layer as mother material can also be formed by any method similar to the powder method or a sputter method. When oxide layer is formed by a method similar to the powder method, mixture powder is subjected to preliminary baking in the air at 850-950 deg.C for 1-100 hr, and the product is crushed followed by sintering in oxygen gas atmosphere at 850-950 deg.C for 5-200 hr, and this sintering shall preferably be crushed and the obtained powder be put in close contact with the base. This provides a compound superconductive wire having large critical amperage and high critical temp. characteristic peculiar to compound superconductive body of oxide type.
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公开(公告)号：JPS63289725A
公开(公告)日：1988-11-28
申请号：JP12461287
申请日：1987-05-21
Applicant: TOSHIBA CORP
Inventor： YAMADA MINORU , NAKAYAMA SHIGEO , MURASE AKIRA
Abstract: PURPOSE:To secure a compound superconductive thin film in an oxide system by installing an evaporation layer of composition L-Ba-Cu containing the specified metal L, on a substrate, and performing heat treatment in an oxygen atmosphere. CONSTITUTION:Metal L is selected out of Y, Er, Dy, Sm, Gd, Ho, Nd, Yb, Tm and Lu. For example, a disk consisting of Y1Ba2Cu3 is used for a target and thereby a thin film of 1mum or so in thickness is produced on the surface of an SiO2 in Ar gas by means of a spatter process. Next, when heat treatment for two hours at a temperature of 900 deg.C is added to this film under oxygen gas flowing, a compound superconductive layer with composition of Y1Ba2Cu3 O7-Y is securable. According suchlike constitution, such a thin film with a high critical temperature characteristic inherent in an oxide compound superconductor is formable in a good reproducible manner.
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公开(公告)号：JPS63287010A
公开(公告)日：1988-11-24
申请号：JP12185987
申请日：1987-05-19
Applicant: TOSHIBA CORP
Inventor： YAMADA MINORU , NAKAYAMA SHIGEO , MURASE AKIRA
Abstract: PURPOSE:To manufacture a coil without cracking and distortion by containing a spiral separation filler in a compression cavity of a metal mold, filling mixture therein, applying an axial compression force to the content in the cavity to obtain a compression block, and heat treating the block. CONSTITUTION:Spirally formed separation filler 5 is contained in compression cavities of metal molds 3, 4 having a cylindrical compression cavity, and the step of filling mixture 1 of several types of powders including elements to be synthesized with oxide compound superconductor in the cavity formed by the presence of the filler 5 is provided. Then, the content in the cavity 2 is applied by axial compression force of 1000 kg/cm larger to provide the step of obtaining a cylindrical compress block. Then, the step of heat treatment for the block in an oxygen atmosphere is provided. Thus, the number of turns of the filler 5 set to simply manufacture a superconducting coil of desired num ber of turns is simply manufactured, shaped in a coil form, then heat treated at 850-950 deg.C for 2 hours. Accordingly, the superconducting layer is manufac tured without cracking and deformation.
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公开(公告)号：JPS63282690A
公开(公告)日：1988-11-18
申请号：JP10730987
申请日：1987-04-30
Applicant: TOSHIBA CORP , TOSHIBA ENGINEERING CO
Inventor： KAWAKAMI SEISHIRO , YAMADA MINORU
IPC: G21C7/26
Abstract: PURPOSE:To prevent the lowering in the output of a nuclear reactor, by preventing the increase in the speed of a recirculation pump when the operating point of the nuclear reactor reaches a holding line and slowly decreasing the speed of said pump when said operating point reaches a run-back line. CONSTITUTION:When the operating point of the nuclear reactor monitored by a monitor circuit 11 reaches a preset holding line, a holding order is outputted from an interlock circuit 12. Whereupon, an automatic/manual changeover contact 13 is changed over from an a-side to a b-side and a holding contact 15 is turned On and a signal prohibiting speed setting 'increase' operation is applied to a speed controller 4 from a setting device 14. When the operating point of the nuclear reactor reaches a run-back line, a run-back command is outputted from the circuit 12. Whereupon, a run-back contact 17 is turned ON and a gentle speed decreasing command signal is applied to the controller 4 from a run-back signal generator 16. Since the run-back of this recirculation pump gently lowers the speed of the recirculation pump, an operating region generating the deterioration of the capacity of the machinery is evaded and the unnecessary lowering in the output of the nuclear reactor can be prevented.
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Patent Agency Ranking
公开(公告)号：JPS63278308A
公开(公告)日：1988-11-16
申请号：JP11431487
申请日：1987-05-11
Applicant: TOSHIBA CORP
Inventor： YOSHINO HISASHI , FUKUSHIMA SHIN , NIBU HIROMI , YAMADA MINORU , NAKAYAMA SHIGEO , MURASE AKIRA
Abstract: PURPOSE:To enhance productivity and to manufacture a superconductive coil composed of an inorganic material completely, by filling a metallic tube with perovskite type oxide superconductor powder to form superconductor wires and interposing heat-resisting insulating materials among these wires and forming them into a coiled shape and then providing them with heat treatment. CONSTITUTION:A metallic tube is filled with perovskite type oxide superconductor powder so as to form superconductor wires. Heat-resisting insulating materials are interposed among these wires, and they are formed into a coiled shape and then provided with heat treatment. A fiber made of alumina, quartz, and the like can be used as said insulating material, otherwise an inorganic polymer may be impregnated among the wires. Thereafter they are fired in an atmosphere containing oxygen. It is preferable that a superconductive state can be realized by an oxide superconductor which contains rare earth elements and has perovskite type structure. After these raw materials are mixed, they are assumedly fired and pulverized to obtain their desired shape and then fired. Hence, a superconductive coil provided with high temperature heat treatment and inorganic features can be obtained with excellent productivity.
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公开(公告)号：JPS63242957A
公开(公告)日：1988-10-07
申请号：JP7590187
申请日：1987-03-31
Applicant: TOSHIBA CORP
Inventor： YAMADA MINORU , MURASE AKIRA , YOSHINO HISASHI
Abstract: PURPOSE:To increase the oxygen content in the compound layer to increase the critical temperature of superconductivity by heat-treating at elevated temperature, followed by heat treatment at low temperature in the sintering of a mixed powder of elements, shown in a prescribed formula, forming a layer perovskite type compound superconducting material. CONSTITUTION:A mixed powder of plural compounds containing elements which form a layer perovskite type compound superconducting material of the general formula (La1-xMx)CuO4-y (M is Sr) is prepared. The powder contains La or its oxide, Sr or its oxide or carbonate and Cu or its oxide. The mixed compound powder is calcinated, crushed, mixed again to prepare a powder. The powder is formed and heat-treated at 900-1,200 deg.C. Finally, the product is heat-treated in air at 400-700 deg.C.
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公开(公告)号：JPS63239990A
公开(公告)日：1988-10-05
申请号：JP7169587
申请日：1987-03-27
Applicant: TOSHIBA CORP
Inventor： YAMADA MINORU , MURASE AKIRA
Abstract: PURPOSE:To obtain a superconducting transistor able to be sufficiently cooled with liquid nitrogen while shortened its manufacturing process, a flat surface and no change with the lapse of time due to oxidation by using a superconductor of L-M-Cu-O oxide for the source-drain electrode parts. CONSTITUTION:A Y-Ba-Cu-O film 2 is vacuum-evaporated on an Si wafer 1 by a sputtering method. The sputtering at this time is performed with the gas composition of Ar-10% O2 while causing lack of oxygen concentration inside the film so as to produce a semiconductor. Next, since the superconductive source-drain parts are formed on this Y-Ba-Cu-O semiconductor film, the part except the source-drain parts is covered with a resist film 3 for being given heat treatment for one h at 500 deg.C inside a diffusion furnace in which O2 gas is made to flow. In this treatment, oxygen gets mixed with the part having no resist so that only these source-drain parts 5a and 5b become superconductors. This element can control a superconduction current between the source and the drain with the gate voltage so as to function as a three- terminal transistor element.
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公开(公告)号：JPS63224375A
公开(公告)日：1988-09-19
申请号：JP5810187
申请日：1987-03-13
Applicant: TOSHIBA CORP
Inventor： MIZUSHIMA KOICHI , YAMADA MINORU , MURASE AKIRA
Abstract: PURPOSE:To obtain stable characteristics by using an oxide superconductor for source, drain electrodes to operate them at liquid temperature or higher. CONSTITUTION:In a superconducting transistor of the structure in which source, drain electrodes 5, 6 made of a superconductor are formed at predetermined intervals on one side surface of a semiconductor layer, and a gate electrode 3 for controlling a carrier concentration distribution in the semiconductor layer is formed on the other side surface, oxide superconductors are used as the electrodes 5, 6. That is, the oxide superconductor exhibits very high critical temperature, such as 30K or higher exhibiting superconduction, exhibits the superconduction at liquid nitrogen temperature, thereby providing excellent stability in the atmosphere as compared with intermetallic compound superconductor, and excellent boundary characteristic from the semiconductor of silicon. Thus, it can be operated at temperature obtained by a simple refrigirator, thereby obtaining stable element characteristics at less aging change.
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公开(公告)号：JPS6386811A
公开(公告)日：1988-04-18
申请号：JP23170186
申请日：1986-09-30
Applicant: TOSHIBA CORP
Inventor： YAMADA MINORU , MURASE AKIRA , SASAKI MITSUO , NAKAMURA SUGURU
Abstract: PURPOSE:To execute the uniform surface treatment without effect of thermal strain by applying laser beam under condition of bringing the other face of sample into contact with a sample holding table and also pushing both end part of longitudinal direction to the sample holding table. CONSTITUTION:The thin rectangle sample 11 is laid on the upper face of sample table 10 cooled by cooling system and the both end part along the longitudinal direction of this sample 11 is pushed to the sample holding table 10 by holding plates 12a, 12b. Next, the sample table 10 is set on a carrying mechanism under Ar gas or air and while shifting the sample table 10 toward the direction shown by the arrow mark 13 at the constant speed, the laser beam 14 set beforehand at the prescribed spot diameter form a laser beam source is applied, to execute surface treatment. In this way, even if the sample is extremely thin plate-shaped or tape shaped, uniform surface treatment without effect of any thermal strain is possible.
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