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1. 发明专利

JPS6476916A PRODUCTION OF OXIDE SUPERCONDUCTING MATERIAL 失效
公开(公告)号：JPS6476916A
公开(公告)日：1989-03-23
申请号：JP1697588
申请日：1988-01-29
申请人： OGUSHI TETSUYA , HITACHI LTD
发明人： OGUSHI TETSUYA , SHIRAKU YOSHINORI , OGATA HISANAO , ISHIKAWA YUICHI , OGUCHI YUKO
IPC分类号： C01G3/00 , C01G1/00 , C01G23/00 , C01G25/00 , C01G27/00 , C01G31/00 , C01G33/00 , C01G35/00 , C23C14/08 , H01B12/00 , H01B13/00 , H01L39/12
摘要： PURPOSE:To obtain the titled superconducting material having high superconducting transition temperature and usable without necessitating ultra-low temperature environment, by substituting a part or total of Cu in a group Ia or IIIa element - group IIa element - Cu oxide with other metallic element. CONSTITUTION:Powder of e.g. an oxide of an element L selected from group IIa metal element and group IIIa element (e.g., La2O3), powder of e.g. a carbonate of an element A selected from group IIa element (e.g., SrCO3) and CuO powder are weighed to attain a prescribed composition and mixed with each other. The powder mixture is reacted by heating at 900-1,000 deg.C in an oxidizing atmosphere to obtain an oxide mixture powder of formula I (0 =150 deg.K.

2. 发明专利

JPH1183248A PIPING STRUCTURE OF REFRIGERATION CYCLE 失效
公开(公告)号：JPH1183248A
公开(公告)日：1999-03-26
申请号：JP24885297
申请日：1997-09-12
申请人： HITACHI CABLE , HITACHI LTD
发明人： OZAKI TOSHINORI , ISHIKAWA YUICHI
IPC分类号： F17D5/02 , C23F13/00 , C23F13/02 , F25B47/00
摘要： PROBLEM TO BE SOLVED: To carry out removal by neutralization of an acid or oxidizing corrosive substance which is generated by the degrading of a cooling medium. SOLUTION: In a piping structure connected to a compressor 1 in a refrigerating cycle through which a cooling medium is circulated, Cu ion removers 21 and 31 into which is sealed a metal material baser in potential than Fe in a Cu ion aqueous solution or made so by applying a potential are connected to Cu pipes 10 and 11 made of Cu or a Cu alloy and used for at least a part of a high temperature piping 4 on the discharge side and/or a low temperature piping 6 on the suction side.

3. 发明专利

JPH0821793A METHOD FOR EVALUATING CORROSION RESISTANCE OF METALLIC MATERIAL, METHOD FOR DESIGNING HIGH CORROSION-RESISTANT ALLOY, METHOD FOR DIAGNOSING CORROSION STATE OF METALLIC MATERIAL AND METHOD FOR OPERATING PLANT 失效
公开(公告)号：JPH0821793A
公开(公告)日：1996-01-23
申请号：JP15756794
申请日：1994-07-08
申请人： HITACHI LTD
发明人： SAKAI MASANORI , ONAKA NORIYUKI , ISHIKAWA YUICHI , FUJIMORI HARUO , ISOBE YUSUKE , TAKAHASHI TAKUYA
IPC分类号： C23F11/18 , C23F15/00 , G01N17/00 , G01N27/26 , G01N27/416 , G01N33/20 , G21D1/00
摘要： PURPOSE:To evaluate a corrosion damage, etc., based on a theoretical background by comparing a critical condition determined on the basis of data including a level of a valence band of a passive state film in a flat band state and a Fermi level of a corrosion system. CONSTITUTION:The dissolving speed of a passive state film is exponential function of potential difference DELTAphiH in an electric double layer. Therefore, when the potential difference DELTAphiH in the electric double layer is increased even slightly, the dissolving speed is increased rapidly. That is, a stable area is broken. Therefore, a critical condition determined based on data including a level of a valence electron band of the passive state film in a flat band state is obtained. Moreover, a Fermi level of a corrosion system including the passive state film and a corrosion environment under a target corrosion environment is obtained. A corrosion resistance is evaluated by comparing the Fermi level with the critical condition. Accordingly, environment in a plant (e.g. quality of cooling water in an atomic plant) can be controlled to make a structural material stable.

4. 发明专利

JPH07153402A REFORMING METHOD OF STRUCTURAL MATERIAL DEFECTIVE PART IN PLANT 失效
公开(公告)号：JPH07153402A
公开(公告)日：1995-06-16
申请号：JP29625893
申请日：1993-11-26
申请人： HITACHI LTD
发明人： OKIDO SHINOBU , ISHIKAWA YUICHI , YOSHIMURA TOSHIHIKO
IPC分类号： G01N37/00 , G01Q60/10 , G01Q80/00 , H01J37/06 , H01J37/28
摘要： PURPOSE:To enhance characteristics of a material by conducting addition or removal of a quantity necessary for material reforming in a defective part of a structural material wherein a little defect such as a chrome shortage portion in the vicinity of a grain boundary and a deposition of phosphorous or the like causes deterioration of the whole characteristics of the material. CONSTITUTION:A detecting probe 22 having a tip of several mum is brought close several nm to a sample surface and a voltage is applied across the detecting probe 22 and the sample. Scanning of an arm 24, while maintaining a generated tunnel current at a fixed value, enables obtaining of information on the sample surface. Then, a probe 21 made of a reforming material is moved to this position and a voltage sufficient for electric field vaporization is applied to deposit a film on the surface, while the voltage direction across the sample and the probe 21 is inverted to remove impurities on the sample surface.

5. 发明专利

JPH0743373A METHOD AND APPARATUS FOR OBSERVING/MEASURING CONDUCTIVE MEMBER 失效
公开(公告)号：JPH0743373A
公开(公告)日：1995-02-14
申请号：JP18961093
申请日：1993-07-30
申请人： HITACHI LTD
发明人： ISHIKAWA YUICHI , YOSHIMURA TOSHIHIKO , OKIDO SHINOBU , NISHIKAWA OSAMU
IPC分类号： G01N1/32 , G01N37/00 , H01J37/285 , H01J49/40
摘要： PURPOSE:To decrease the dead time significantly while allowing two-dimensional analysis of sample using the planar surface of sample as a beam source. CONSTITUTION:A multitip comprises a large number of tips 11 arranged on the plane of one substrate 12 with the length and the interval of needle being selected depending on the application. The multitip is pointed mechanically by dicing a planar sample 21 by means of a cutter 22. Consequently, the tips 11 can be mass produced in a short time and two-dimensional information can be obtained through analysis. The edge angle 23 of the cutter 22 determines the tip angle 24. When the multitip is employed as a sample for atom probe, all points of the multitip are immersed into an electrolyte and polished thus obtaining a sharp multitip having the radius of curvature of 1000Angstrom or less at the point. A large number of steep tips can be made simultaneously in a short time.

6. 发明专利

JPH0562639A ATOMIC ARRANGEMENT STEREO-ANALYSIS METHOD AND APPARATUS THEREFOR 失效
公开(公告)号：JPH0562639A
公开(公告)日：1993-03-12
申请号：JP21960591
申请日：1991-08-30
申请人： HITACHI LTD
发明人： YOSHIMURA TOSHIHIKO , ISHIKAWA YUICHI , TSUCHIYA SHUNICHI
IPC分类号： H01J37/285 , H01J49/10 , H01J49/40
摘要： PURPOSE:To enhance the reliability of the remaining life estimation as well as of the evaluation of the degree of brittleness in plant-forming members through cubic visualization/analysis of all constructional atoms in the region of a needle-like sample tip and hence highly precise quantifiability of the behavior of minutely added elements greatly contributing to making the stainless steel brittle. CONSTITUTION:In order to increase the ion detection efficiency of a conventional position sensitive atom probe (three-dimensional atom probe) and increase the position resolving power of the detection ions, a needle-like sample is provided, at its tip, with a mechanism for post ionizing of the particles not field vaporized in synchronism with the pulse, and the position detector is provided with a mesh electrode 1004 for again taking the ions 1003 splashed by a part of the surface of an electron multiplier plate 1001, into the electron multiplier plate 1001.

7. 发明专利

JPH04367335A CONNECTING METHOD FOR STAINLESS STEEL TUBE AND ZIRCONIUM ALLOY TUBE 失效
公开(公告)号：JPH04367335A
公开(公告)日：1992-12-18
申请号：JP13996391
申请日：1991-06-12
申请人： HITACHI LTD
发明人： HOSAKA NOBUYOSHI , ISHIKAWA YUICHI , KIMOTO HIROSHI , DOGE HIDENORI , SUZUKI KENICHI
IPC分类号： B21D39/04 , C23F13/00 , C23F13/14 , G21C3/06 , G21D1/00
摘要： PURPOSE:To prevent the crevice corrosion of stainless steel by providing a connecting part in which a metallic member consisting of iron or carbon steel is interposed between a tubular member consisting of zirconium and a tubular member consisting of stainless steel. CONSTITUTION:In the case a different kind metal joined part of zirconium (alloy) and stainless steel formed by joining the end parts of a tubular umber 1 consisting of zirconium (alloy) and a tubular member 2 consisting of stainless steel is exposed in high temperature water of 200 deg.C-300 deg.C, it is prevented that this different kind metal connecting part is damaged due to crevice corrosion. Therefore, the different kind metal connecting end part is subjected to anodic melting by interposing a metallic member consisting of iron or carbon steel 3 and the stainless steel tube and the zirconium (alloy) tube are subjected to cathodic protection. In such a way, it can be prevented that stainless steel is damaged due to crevice corrosion in the different kind metal connecting part.

8. 发明专利

JPH04123866A JOINT OF ZIRCONIUM ALLOY TUBE 失效
公开(公告)号：JPH04123866A
公开(公告)日：1992-04-23
申请号：JP24396890
申请日：1990-09-17
申请人： HITACHI LTD
发明人： HOSAKA NOBUYOSHI , CHIBA KADOMASA , HASEGAWA KUNIO , ISHIKAWA YUICHI
IPC分类号： F16L13/00 , B23K1/18
摘要： PURPOSE:To remarkably reduce crevice corrosion at the zirconium alloy side by forming the joint of the zirconium alloy tube by subjecting a joint medium such as tantalum and titanium to thermal spraying at the joining surface side of a second tubular member made of stainless steel of a first tubular member of a zirconium alloy. CONSTITUTION:Third material. 5 of tantalum, etc., thermally sprayed on the zirconium alloy is interposed between the zirconium alloy and the second material when this zirconium alloy tube 1 is subjected to rolled joint joining to the tube 3 made of the second material such as stainless steel. As a result, even if hydrogen is generated by an electrochemical. action such as crevice corrosion between the second material and the third material, the third material. absorbs the hydrogen which is not immediately diffused to the zirconium alloy. As a result, hydrogen concentration of the zirconium alloy is maintained low and the same material. does not become brittle. Consequently, the rolled joint of the zirconium alloy with high reliability can be furnished.

9. 发明专利

JPH0420886A SQUID FLUXMETER 失效
公开(公告)号：JPH0420886A
公开(公告)日：1992-01-24
申请号：JP12446090
申请日：1990-05-15
申请人： HITACHI LTD
发明人： YOSHIMURA TOSHIHIKO , SUTEIIBU EBANSON , HASEGAWA KUNIO , OTAKA MASAHIRO , ISHIKAWA YUICHI
IPC分类号： G01R33/035 , H01L39/22
摘要： PURPOSE:To decrease signal noises in a SQUID fluxmeter and to improve sensitivity by providing a pickup coil comprising a high-temperature superconductor material, and cooling only the SQUID to the temperature of liquid helium. CONSTITUTION:For a SQUID 100, a superconductor material which is operated at the temperature of liquid helium is used. For the pickup coil 101, a thin film of high-temperature superconductor material having high transition temperature is used. The coil 101 is connected to the SQUID 100 through a heat switch 102 and a plug 103 which can be attached and removed. Only the SQUID 100 and the switch 102 are submerged into a liquid helium vessel 105. A heat radiation shield 108 is arranged around the vessel 105. The entire shield 108 is inserted into a vacuum chamber 110 with evacuating bellow 109. The inside is shielded from the external area with the vacuum. A base plate 111, which is sealed with the chamber 110 and an O ring and forms a part of the chamber 110, is arranged in front of the coil 101. The base plate 111 can be attached and removed. The plate 11 is made to approach a sample 112. The output signal of the SQUID 100 is transmitted into a SQUID control circuit 113 and processed in a computer.

10. 发明专利

JPH02290265A PURIFICATION OF HIGH PURITY SUPERCONDUCTOR 失效
公开(公告)号：JPH02290265A
公开(公告)日：1990-11-30
申请号：JP10765089
申请日：1989-04-28
申请人： HITACHI LTD
发明人： OZAKI TOSHINORI , ISHIKAWA YUICHI , TSUJIKAWA SHIGEO
IPC分类号： B03C1/00 , C01B13/14 , C01G1/00 , H01B13/00
摘要： PURPOSE:To obtain a product excellent in superconductivity by preparing a material of a high purity superconductor to process the same by grinding substance consisting of a superconductor and impurity into a powder and subsequently applying magnetic flotation action to said powder to separate and purity only the superconductor. CONSTITUTION:In the preparation of a Y-2Ba-3Cu-XO type superconductor, the superconductor subjected to the third stage of baking is ground into a particle size of 1-100mum and the obtained powder is allowed to gently fall on the thin paper 3 placed on an electromagnet 4 in a dry atmosphere lower by about 10 deg.C than critical temp. Tc to be brought to a state separated into a powder 1 (superconductive substance) and a powder 2 (impurity). Only the powder 1 is scraped up from this state to be temporarily molded and the molded one is again baked in the same way as the third stage. By this method, a high purity superconducting material drastically enhanced in critical current density is obtained.

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