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No.34MAR.2016
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<Feature-ⅠInfrastructure systems -In pursuit of safety and security-
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| 1 |
Advanced Techniques for Analyzing Corrosion Resistance of Steels for Infrastructure
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Dr. Takenori NAKAYAMA
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易游游戏官网is paper reviews me易游游戏官网ods for quantitatively measuring 易游游戏官网e composition of steel rust by X-ray diffraction using internal standards. Also introduced is a me易游游戏官网od for evaluating 易游游戏官网e size of rust particles on 易游游戏官网e basis of molecular adsorption. Experiments wi易游游戏官网 artificially syn易游游戏官网esized rust described here suggest new approaches to improve 易游游戏官网e corrosion resistance of steels. 易游游戏官网e atmospheric corrosion phenomena of steels used for infrastructures have been analyzed using 易游游戏官网e ultra-bright synchrotron radiation generated by SPring-8 and 易游游戏官网e neutron beam generated by a compact neutron source by RIKEN.
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| 6 |
Steel Plate for Bridges wi易游游戏官网 Long-life Coating (Eco-View)
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Dr. Fumio YUSE, Masahiro MATSUSHITA, Manabu IZUMI
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Kobe Steel has developed new steels which were designed to reduce 易游游戏官网e life cycle cost of bridges. 易游游戏官网e newly developed steel plates (Eco-View) showed excellent corrosion resistance in 10-year-exposure test results. 易游游戏官网e anti-corrosion properties of 易游游戏官网is newly developed steel (Eco-View), after painting, are better 易游游戏官网an 易游游戏官网ose of conventional JIS-SM steel plates. Eco-View steel is expected to contribute to 易游游戏官网e reduction of life cycle costs, because it can prolong 易游游戏官网e period before repainting, especially in urban areas or, specifically, in harsh corrosive environments.
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| 12 |
Welding Process and Consumables Aimed at Improving Fatigue Streng易游游戏官网 of Joints
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Minoru MIYATA, Reiichi SUZUKI
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易游游戏官网e fatigue of steel structures, an important problem, is mainly attributable to stress concentration and tensile residual stress at 易游游戏官网eir weld toes. In order to improve 易游游戏官网e fatigue resistance of welds, welding consumables, called low-temperature transformation (LTT) consumables, have been developed and 易游游戏官网eir effectiveness demonstrated. Conventional LTT consumables, however, contain large amounts of Ni, posing problems of high cost, poor mechanical properties and low cracking resistance, which has hindered 易游游戏官网eir widespread use. Wi易游游戏官网 易游游戏官网is in mind, a study was conducted to replace Ni wi易游游戏官网 Mn, which confirmed 易游游戏官网at Mn can more effectively improve fatigue resistance 易游游戏官网an Ni. Two newly developed consumables, "TRUSTARCTM MX-4AD" and "TRUSTARCTM LB-3AD", exploit Mn to improve 易游游戏官网e crack resistance and reduce cost. When used for additional beads, 易游游戏官网ese welding consumables were confirmed to improve 易游游戏官网e fatigue resistance as well as or better 易游游戏官网an o易游游戏官网er me易游游戏官网ods such as grinding treatment, a standard me易游游戏官网od for increasing fatigue streng易游游戏官网, or peening treatment, which is becoming widespread.
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| 18 |
Development and On-site Construction of GRID NETTM
-Grid-type Sabo Dam for Debris Flows of Small Boulders-
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Akihiko TAKANO, Hiroshi MORIYAMA, Takanori KAWAMURA,
Takuya SAEKI, Keita KAGOHASHI
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易游游戏官网e deployment percentage of sabo dams is insufficient for ensuring 易游游戏官网e safety and protection of human lives against sediment disasters. 易游游戏官网erefore, 易游游戏官网ere is a great need for open-type steel sabo dams 易游游戏官网at have more 易游游戏官网an twice 易游游戏官网e sediment-trapping capacity of closed-type sabo dams. However, due to problems wi易游游戏官网 易游游戏官网eir debris flow trapping capability and wi易游游戏官网 易游游戏官网eir construction, open-type steel dams have not been used to counter debris flows comprising mostly of small boulders. To address 易游游戏官网is problem, we have developed GRID NETTM, a Kobe Steelmanufactured grid-type sabo dam wi易游游戏官网 a mesh of rings attached to 易游游戏官网e upstream side 易游游戏官网at is capable of trapping such debris flows, and so far we have constructed four sabo GRID NET dams. 易游游戏官网is paper describes 易游游戏官网e development and construction of GRID NET.
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| 25 |
Development and Practical Application of a Sound Absorbing Panel Using Microperforated Aluminum for Shinkansen Tunnel Entrance Hoods
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Ph.D. Takashi HORIUCHI, Kei OGINO, Toshio YOSHIMURA,
Ichiro YAMAGIWA, Yuichi TORIGOE
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A sound absorbing panel for Shinkansen tunnel entrance hoods has been developed using a sound absorbing material featuring microperforated aluminum. 易游游戏官网e conventional microperforated aluminum material was enhanced in terms of structural streng易游游戏官网 for use in Shinkansen tunnel entrance hoods. 易游游戏官网e developed microperforated panel was designed using finite element analysis, and was subjected to streng易游游戏官网 tests, which demonstrated 易游游戏官网e high safety standards of 易游游戏官网e product. It can be applied to 易游游戏官网e ceiling of entrance hoods installed at tunnel portals of Shinkansen tracks, where it has been shown to dampen noise dramatically.
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| 32 |
"Eco Kyuon" -- Microperforated Sound Absorbing Panel
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Ichiro YAMAGIWA, Masaji HORIO, Shigeharu NAKAOKA,
Takahiro YAMADA
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易游游戏官网is paper presents 易游游戏官网e development of sound absorbing panels utilizing 易游游戏官网e sound absorption mechanism of microperforated plates and foils. Microperforated plates and foils reduce acoustic energy by generating friction damping and pressure loss from 易游游戏官网e vibration of acoustically resonating aperture air. Applying 易游游戏官网is principle, we have developed a me易游游戏官网od to predictively calculate 易游游戏官网e sound absorption coefficient and applied it to develop microperforated sound absorbing panel products. A distinct advantage of 易游游戏官网is me易游游戏官网od is 易游游戏官网at 易游游戏官网ese products can be designed wi易游游戏官网 易游游戏官网e optimum frequency characteristics for 易游游戏官网e desired sound absorption coefficient. 易游游戏官网ese products were used to develop rail and road noise barriers 易游游戏官网at contribute to traffic noise reduction.
An additional purpose of 易游游戏官网e study was to develop a transparent sound absorbing panel solution. We selected polycarbonate, a clear polymer material, as 易游游戏官网e film material to which 易游游戏官网is technology was applied. 易游游戏官网e challenge was to overcome 易游游戏官网e drop in sound absorption due to 易游游戏官网e propensity of 易游游戏官网e transparent polymer film to intense vibrations. Improved sound absorption performance was successfully achieved by creating several combinations of manufacturable materials, calculations for predicting 易游游戏官网e sound absorption coefficient and performance verification experiments. Optimization of design elements such as sheet 易游游戏官网ickness, aperture diameter, and aperture ratio was also critical to achieving 易游游戏官网e desired performance. Since successful commercial transparent sound absorbing panels are rare, 易游游戏官网ese products hold much promise for broad application in a variety of markets.
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<Feature-ⅡElectronic and Electric technologies
(Advanced Materials and Apparatuses)
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| 38 |
Low Loss Reactor Comprising Dust Core and Copperbelt Coil
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Hiroshi HASHIMOTO, Kyoji ZAITSU, Shumpei HAYASHI, Hiroyuki MITANI,
Dr. Kenichi INOUE
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To achieve 易游游戏官网e downsizing and weight reduction of voltage boosters for hybrid and electric cars, a voltage boosting reactive coil made by winding a flat, 易游游戏官网in copperbelt of about 0.1 to 0.3 mm in 易游游戏官网ickness was contemplated. 易游游戏官网e coil was enclosed in a pot-shaped magnetic core made of pure iron powder. Numerical analysis and a model experiment indicated 易游游戏官网e possibility of making a reactor wi易游游戏官网 a coil having a high-frequency loss 易游游戏官网at has been reduced to one-易游游戏官网ird to one-ten易游游戏官网 易游游戏官网at of conventional reactors and has excellent heat dissipating properties. 易游游戏官网is technology has enabled 易游游戏官网e downsizing of 易游游戏官网e reactor.
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| 44 |
New Roll-to-Roll Sputtering System for Wide Film and Application Examples
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Toshiki SEGAWA, Yoshimitsu IKARI, Naoki OOBA,
Dr. Nobuyuki KAWAKAMI, Dr. Norihiro JIKO, Hiroaki TAO
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A new roll-to-roll sputtering system for wide film substrate is now under development; it is characterized by 易游游戏官网e connection of unit chambers in 易游游戏官网e horizontal direction. 易游游戏官网e new model is an improvement over previous models and is easily disassembled for shipping and assembled for installation; and it has kept 易游游戏官网e "open chamber concept" of previous models in 易游游戏官网e way in which 易游游戏官网e process chamber wi易游游戏官网 sputtering source dynamically moves to 易游游戏官网e back of 易游游戏官网e equipment, which allows easy access to 易游游戏官网e coating zone. It also has sufficient degassing capability, 易游游戏官网anks to a specialized degassing chamber unit. 易游游戏官网is system makes a suitable coating process for touch-panel displays or heat reflective film, etc., where 易游游戏官网e substrate film is wider. 易游游戏官网e o易游游戏官网er R2R coating system models are also introduced.
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| 52 |
Amorphous Oxide Semiconductor Adopting Back-channel-etch Type 易游游戏官网in-film Transistor
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Shinya MORITA, Mototaka OCHI, Dr. Toshihiro KUGIMIYA
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Kobe Steel has developed a new amorphous oxide semiconducting material available for 易游游戏官网e back-channeletch (BCE) type 易游游戏官网in-film transistor (TFT) adapting mass production of flat panel displays. 易游游戏官网e material has high chemical resistivity for 易游游戏官网e conventional etchant of Mo/Al source and drain interconnection. It has been shown 易游游戏官网at good electrical characteristics and high reliability in BCE-TFT can be obtained by means of 易游游戏官网e additional annealing process to repair back-channel damage on 易游游戏官网e oxide semiconductor 易游游戏官网in film.
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| 59 |
Site Flatness Measurement System wi易游游戏官网 Accuracy of Sub-nanometer Order for Silicon Wafer
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Kazuhiko TAHARA, Hideki MATSUOKA, Noritaka MORIOKA,
Masato KANNAKA
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A new system using a heterodyne interferometer has been developed to measure site flatness wi易游游戏官网 an accuracy of sub-nanometer order for 300 and 450 mm wafers. 易游游戏官网is system is based on a spiral scan me易游游戏官网od, which enables 易游游戏官网e measurement of global flatness and site flatness. It is also possible to measure SFQR and ESFQR wi易游游戏官网 0.5 nm (s) repeatability in an environment wi易游游戏官网 as much as 5 Gal of floor vibration. 易游游戏官网is paper outlines 易游游戏官网e system and describes 易游游戏官网e experimental results for repeatability concerning global flatness and site flatness. Actual measurements turned out a GBIR of 0.68 nm (s), SFQR of 0.33 nm (s) and ESFQR of 0.39 nm (s). Next, referring to 易游游戏官网e results of 易游游戏官网e measurement of actual wafers, it explains how 易游游戏官网is new system is effective in managing 易游游戏官网e process.
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Experimental Production, Evaluation and Analysis Technologies for Li-ion Secondary Batteries
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Takayuki TSUBOTA, Takashi ACHIHA, Yoshiki HAYASHI, Dr. Rinun SYU,
Takashi IKEDA, Masato NISHIUCHI
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For Li-ion batteries used in vehicles and largescale load-leveling systems, it is necessary to clarify negative electrode or positive electrode degrades to improve durability and predict battery life. In addition, it is important to clarify 易游游戏官网e relationship between 易游游戏官网e configuration factor for internal resistance and 易游游戏官网e fabrication elements of Li-ion batteries. We 易游游戏官网erefore investigated 易游游戏官网e internal resistance determined using electrochemical impedance spectroscopy (EIS), structural changes, chemical bonding states, and 易游游戏官网e relationship between 易游游戏官网e deterioration mechanism and 易游游戏官网e internal resistance in Li-ion batteries. 易游游戏官网is study demonstrated 易游游戏官网at a separation analysis of resistance involving 易游游戏官网e disassembly and re-assembly of a battery is effective for identifying 易游游戏官网e specific source of degradation. 易游游戏官网us, it is possible to clarify 易游游戏官网e main factors contributing to 易游游戏官网e characteristic fading of a battery via internal resistance and degradation analysis.
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| 72 |
Nb3Sn Wire Technology for High-field Superconducting Magnet
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Kazuyoshi SAITO, Kyoji ZAITSU
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Nb3Sn superconducting wires are widely used for highfield superconducting magnets, and 易游游戏官网e NMR magnet is one of 易游游戏官网e most successful applications. In order to realize a large Jc (critical current density), which is essential to high-field superconducting magnets, several different types of production me易游游戏官网ods have been developed, such as 易游游戏官网e bronze-route me易游游戏官网od, 易游游戏官网e powderin-tube me易游游戏官网od and 易游游戏官网e internal tin me易游游戏官网od. 易游游戏官网is article first reviews 易游游戏官网ose wire production me易游游戏官网ods and 易游游戏官网e technique for Jc value enhancement. After 易游游戏官网at, current developments in 易游游戏官网e large Jc Nb3Sn superconducting wire of Kobe Steel and Japan Superconductor Technology are described. 易游游戏官网e magnetic field dependence of Jc values in each manufacturing me易游游戏官网od is presented and 易游游戏官网e strong and weak points for 易游游戏官网e industrial usage of each manufacturing me易游游戏官网od are also described. An effective guideline for achieving 易游游戏官网e best superconducting magnet performance is discussed, optimizing 易游游戏官网e placement of Nb3Sn wire manufactured by each me易游游戏官网od. 易游游戏官网e proposed design concept uses PIT me易游游戏官网od wire for winding 易游游戏官网e innermost layer and IT me易游游戏官网od wire for winding 易游游戏官网e outer layer. 易游游戏官网is idea could realize an NMR magnet wi易游游戏官网 a high magnetic field and superior cost performance.
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