Updated on 2025/02/27

写真a

 
YAMAZAKI TAKAHISA
 
Organization
School of Engineering Associate Professor
Title
Associate Professor
External link

Degree

  • Doctor of Engineering ( Tokyo Institute of Technology )

Research Interests

  • 接合工学・表面物性

  • metallurgy

  • soldering

  • brazing

  • bonding

Research Areas

  • Nanotechnology/Materials / Material processing and microstructure control

Education

  • Tokyo Institute of Technology   Science of Engineering

    - 1997

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    Country： Japan

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  • Tokyo Institute of Technology   Graduate School, Division of Science and Engineering

    - 1997

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  • Tokyo Institute of Technology   School of Engineering

    - 1991

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    Country： Japan

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Research History

  • -:東京工業大学大学院 理工学研究科 機械宇宙システム専攻 助教授

    2003

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  • -:Tokyo Institute of Technology

    2003

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  • :宇宙開発事業団 マテリアル・機構技術グループ 宇宙開発特別研究員

    2000 - 2003

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  • :National Space Development Agency of Japan NASDA Research Fellow

    2000 - 2003

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  • :The Institute of Physical and Chemical Research Surface and Interface Laboratory Special Postdoctral Researcher

    1997 - 2000

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  • :理化学研究所 表面界面工学研究室 基礎科学特別研究員

    1997 - 2000

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  • :東京工業大学 工学部 助手

    1993 - 1994

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  • :Tokyo Institute of Technology Faculty Engineering Assistant

    1993 - 1994

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  • :石川島播磨重工業

    1993

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  • :

    1993

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  • Graduate School

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Professional Memberships

Books

  • ダイヤモンドの活性金属ろう付と新ろう材開発手法

    ぶれいず  2003 

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MISC

  • Effect of Nickel-Iron Mixture of Weld Metal on Hydrogen Permeability at Various Temperatures in 316L Stainless Steel

    Takahisa Yamazaki, Toshi-Taka Ikeshoji, Akio Suzumura, Daigo Kobayashi, Kamono Shumpei

    Journal of Solid Mechanics and Materials Engineering   3 ( 6 )   865 - 875   2009

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  • Effect of a Nickel-Iron Mixture of Weld Metal on Hydrogen Permeability at Various Temperatures in 316L Stainless Steel

    YAMAZAKI Takahisa, IKESHOJI Toshi-Taka, SUZUMURA Akio, KOBAYASHI Daigo, KAMONO Shumpei

    JSMME   3 ( 6 )   865 - 875   2009

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    Language：English   Publisher：The Japan Society of Mechanical Engineers  

    It is important to prevent from hydrogen embrittlement cracking in the heat-affected zone of welded steels. The hydrogen permeation rate for bulk nickel at high temperatures is higher than that of stainless steel, although the reverse is true at low temperatures. Low carbon stainless 316L steel, which contained 12-15% nickel, was selected as the parent material for welding. We have investigated the affect of nickel near the heat-affected zone by measuring the hydrogen permeation at various temperatures. We performed hydrogen permeation tests into the bead on plate specimens using nickel filler. A stationary hydrogen gas flux through the stainless steel specimen was measured by using an orifice and a quadrupole mass spectrometer (QMS). The partial pressure difference for hydrogen that was applied to the specimen was able to be kept constant by maintaining a constant gas flow rate through the orifice in a low- pressure room. An orifice with a 3 mm diameter maintained stationary steady-state hydrogen gas flux from the specimen at 620K, while a 1.2 mm diameter orifice maintained the steady pressure at 520 K. The hydrogen permeability, K was calculated based on the measured steady-state hydrogen gas fluxes at various temperatures. These results plotted as log K versus 1/T (reciprocal temperature) could not be interpolated linearly. The permeability values of the specimen at 570 K and 520 K were less than interpolated ones between the value at 620 K and the value at 520K of the 316 L stainless steel substrate as received.

    DOI： 10.1299/jmmp.3.865

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  • Reaction products at brazed interface between Ag-Cu-V filler metal and diamond (111)

    T. Yamazaki, A. Suzumura

    JOURNAL OF MATERIALS SCIENCE   41 ( 19 )   6409 - 6416   2006.10

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    Language：English   Publisher：SPRINGER  

    The composition of a brazing-filler metal in an Ag-Cu-V system which was selected using lattice misfit data, was estimated using perturbation interface model and applied it to the brazing artificial single crystal diamond (111) by unidirectional-solidification brazing. An Ag-27.8Cu system containing less than 1mass%V brazing-filler metal provided stable joint strength (the shear strength at the brazed interface exceeded 200 MPa). Optical observation of the brazed interface revealed that silver crystal grains grew from vanadium carbide islands formed on the diamond. This behavior is consistent with a slight degree of lattice mismatch between silver and vanadium carbide crystals. Atomic force microscope observation revealed small scale islands of the reaction products with good adhesion are enough for brazing diamond (111). X-ray diffraction results indicated several types of vanadium carbides, V8C7, V4C3 and V2C were formed there, and V4C3 reaction product was considered to provide good adhesion between the filler metal and the diamond due to prefer solidification of silver on the reaction products islands.

    DOI： 10.1007/s10853-006-0707-2

    Web of Science

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  • Effect of oxide film on the reduction of hydrogen permeation rate in stainless steel

    Takahisa Yamazaki, Toshi-Taka Ikeshoji, Akio Suzumura, Takafumi Naito

    JSME International Journal, Series A: Solid Mechanics and Material Engineering   49 ( 1 )   58 - 62   2006.7

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    Language：English  

    Characteristics of hydrogen permeation in the stainless steel 304 modified by either facing, ion sputtering, carbon coating or annealing were investigated in order to establish the safe hydrogen-energy-infrastructure using welding. A stationary hydrogen flux from the stainless steel surface was measured by using a system with an orifice. The pressure difference of the specimen was able to maintain constant by controlling the gas flow rate from the orifice in low pressure vessel. The hydrogen permeability was low in two cases of a thin stainless steel with fine facing and that annealed at 1370 K for 2 hours. In these cases, the specimens' surfaces were considered to play hydrogen trap role and to prevent from pairing hydrogen atoms. On the other hand, high hydrogen permeability was obtained in the case of Argon plasma cleaning a low-pressure-vessel side surface. These results suggest that oxide film on the specimens' surface prevent hydrogen desorption.

    DOI： 10.1299/jsmea.49.58

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  • Effect of oxide film on the reduction of hydrogen permeation rate in stainless steel

    T Yamazaki, TT Ikeshoji, A Suzumura, T Naito

    JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING   49 ( 1 )   58 - 62   2006.1

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    Language：English   Publisher：JAPAN SOC MECHANICAL ENGINEERS  

    Characteristics of hydrogen permeation in the stainless steel 304 modified by either facing, ion sputtering, carbon coating or annealing were investigated in order to establish the safe hydrogen-energy-infrastructure using welding. A stationary hydrogen flux from the stainless steel surface was measured by using a system with an orifice. The pressure difference of the specimen was able to maintain constant by controlling the gas flow rate from the orifice in low pressure vessel. The hydrogen permeability was low in two cases of a thin stainless steel with fine facing and that annealed at 1370 K for 2 hours. In these cases, the specimens' surfaces were considered to play hydrogen trap role and to prevent from pairing hydrogen atoms. On the other hand, high hydrogen permeability was obtained in the case of Argon plasma cleaning a low-pressure-vessel side surface. These results suggest that oxide film on the specimens' surface prevent hydrogen desorption.

    DOI： 10.1299/jsmea.49.58

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  • Reaction Products at Brazed Interface between Ag-Cu-V Filler Metal and Diamond (111)

    T. Yamazaki, A. Suzumura

    J. Mater. Sci.   41 ( 19 )   6409 - 6416   2006

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  • Effect of Isothermal Solidification Behavior of Al-Si Brazing Filler Layer on the Braze-ability of Al-Alloy to Stainless Steel in the Air

    IKESHOJI Toshi-Taka, LIU Shuying, SUZUMURA Akio, YAMAZAKI Takahisa

    quarterly journal of the Japan Welding Society   24 ( 4 )   362 - 367   2006

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    Language：Japanese   Publisher：Japan Welding Society  

    In order to clarify such brazing conditions for making sound joints of Al-alloys to stainless steel as to wet the Al-Si brazing filler on the stainless steel before rapid isothermal solidification of the filler, the solidification time is estimated by the numerical analysis and is also measured experimentally. The numerical analysis is conducted for the brazing process of the A1050 pure aluminum base metal and BA4045 aluminum-silicon brazing filler. The analysis contains both the initial dissolution of the base metal by the molten brazing filler and the following isothermal solidification behavior. The movement of the solid-liquid interface is calculated and the total solidification time is estimated. The brazing experiment between the same combination of metals shows the total solidification time is much less than the numerically estimated time. The element analysis by EPMA indicates that the zinc in the flux plays the dominant role in the brazing process. According to the results, the time to solidify the brazing filler layer is 30×10^<-3>H^2 s, where H is the initial brazing filler layer width in μm. To obtain the brazed joint between the Al alloys and stainless steel, the initial brazing filler layer of at least 30μm and the holding time of at least 30 s at the brazing temperature are considered to be suitable for the brazing.

    DOI： 10.2207/qjjws.24.362

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    Other Link： https://jlc.jst.go.jp/DN/JALC/00286139715?from=CiNii

  • ろう材およびはんだ材構成元素選択のための提案

    山崎敬久

    社団法人日本溶接協会 ぶれいず 貴金属ろう部会   40 ( 111 )   39 - 49   2006

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  • Hardness and Lubricity of Nano-Cluster-Diamond-Dispersed Amorphous Carbon Film

    Takahisa Yamazaki

    24th International Symposium on Space Technology and Science   2004-o-1-04v   2004

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  • Hardness and Lubricity of Nano-Cluster-Diamond-Dispersed Amorphous Carbon Film

    Takahisa Yamazaki

    24th International Symposium on Space Technology and Science   2004-o-1-04v   2004

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  • Conductivity mapping with resolution of 140 nm in diameter by eddy current method using small solenoid coil

    T Yamazaki, M Aono

    MATERIALS TRANSACTIONS   43 ( 12 )   3217 - 3221   2002.12

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    Language：English   Publisher：JAPAN INST METALS  

    We propose and investigate a conductivity microscope made possible by improving the eddy current method. The scanning eddy current method using a small probe with a small gap between the probe and sample surface was tried; it could make a map distinguishing fine regions with different electrical conductivity related to electron-defect scattering. A copper-aluminum cold-pressure-welded junction specimen was selected, because it is considered to be a good conductor of electrons and is a commonly used interconnection for large-scale integrated circuits. At the bimetallie joint interface, two stages of 300-nm-thick and 600-min-thick poor-conductivity layers were detected. These poor-conductivity layers of aluminum are considered to include numerous defects and dislocations that were produced by large plastic flow during the welding process. This conductivity microscope can image a terrace layer of about 3.5 mum in width at the welded interface after the layer is annealed for one hour at 470 K, which is comparable to that in the case of scanning electron microscope. The electrical resistivity of this layer was indicated to be lower than that of the aluminum bulk by the estimation of the electrical resistivity. The layer is considered to be an alpha-copper solid solution one. This instrument is available to detect defects and solid solution.

    DOI： 10.2320/matertrans.43.3217

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  • Conductivity mapping with resolution of 140 nm in diameter by eddy current method using small solenoid coil

    Takahisa Yamazaki, Masakazu Aono

    Materials Transactions   43 ( 12 )   3217 - 3221   2002

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    Language：English   Publisher：Japan Institute of Metals (JIM)  

    We propose and investigate a conductivity microscope made possible by improving the eddy current method. The scanning current method using a small probe with a small gap between the probe and sample surface was tried
    it could make a map distinguishing fine regions with different electrical conductivity related to electron-defect scattering. A copper-aluminum cold-pressure-welded junction specimen was selected, because it is considered to be a good conductor of electrons and is a commonly used interconnection for large-scale integrated circuits. At the bimetallic joint interface, two stages of 300-nm-thick and 600-nm-thick poor-conductivity layers were detected. These poor-conductivity layers of aluminum are considered to include numerous defects and dislocations that were produced by large plastic flow during the welding process. This conductivity microscope can image a terrace layer of about 3.5 μm in width at the welded interface after the layer is annealed for one hour at 470 K, which is comparable to that in the case of scanning electron microscope. The electrical resistivity of this layer was indicated to be lower than that of the aluminum bulk by the estimation of the electrical resistivity. The layer is considered to be an α-copper solid solution one. This instrument is available to detect defects and solid solution.

    DOI： 10.2320/matertrans.43.3217

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  • Mutual Inductance of Small Solenoid Coil Equipped with Scanning Tunneling Electron Microscope

    Takahisa Yamazaki, Masakazu Aono

    Mater. Trans. JIM   42 ( 8 )   1705 - 1709   2001

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  • Mutual inductance of small solenoid coil equipped with scanning tunneling electron microscope

    T. Yamazaki, M. Aono

    Materials Transactions   42 ( 8 )   1705 - 1709   2001

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    Language：English   Publisher：Japan Institute of Metals (JIM)  

    A small solenoid coil was equipped with a scanning tunneling electron microscope (STM) which has an iron needle core tip as the probe. Mutual inductance of the coil with a thin gold film on a mica plate was investigated in order to profile electrical conductivity. It is important to maintain a small gap between the tip apex and the sample surface. The gap is related to the distribution of electron scattering by induced current. The conductivity mapping was carried out on a large terrace. If the tip is over the step edge, the output signal from the probe coil becomes unstable. Atomically smooth surface of the specimen was in need for the electrical conductivity mapping. The electrical conductivity on the terrace was almost constant. The mutual inductance values with the gold film at various temperatures were investigated by cooling it below 250 K. The mutual inductance is inversely proportional to the temperature to the one-third power, T1/3. The relationship between the mutual inductance and the temperature was explained by the electromagnetic theory.

    DOI： 10.2320/matertrans.42.1705

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  • Relationship between X-ray diffraction and unidirectional solidification at interface between diamond and brazing filler metal

    Takahisa Yamazaki, Akio Suzumura

    J. Mater. Sci.   35 ( 24 )   6155 - 6160   2000

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  • Relationship between X-ray diffraction and unidirectional solidification at interface between diamond and brazing filler metal

    Takahisa Yamazaki, Akio Suzumura

    J. Mater. Sci.   35 ( 24 )   6155 - 6160   2000

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  • Transference of electric charge at the interface between stabilized zirconia ceramics and brazing filler containing titanium

    T Yamazaki, A Suzumura

    MATERIALS TRANSACTIONS JIM   39 ( 10 )   1007 - 1011   1998.10

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    Language：English   Publisher：JAPAN INST METALS  

    Electrochemical methods were used along with brazing stabilized zirconia ceramics in order to investigate the reaction behavior between the ceramics and reactive metal titanium added to the silver-copper eutectic brazing filler. A 10 Hz, 5 V rectangular wave signal was applied to a brazing specimen and a comparative specimen, which consists of stabilized zirconia ceramics in order to compare each output signal. The output signals were observed during the brazing process using a digital storage oscilloscope. When the brazing filler foil began to melt, the waveform of the signal from the brazing specimen became sloped. The gradient of the slope was large at the beginning. As the brazing time proceeded, the gradient of the slope gradually decreased. It was suggested that the electric double-layer was formed at the brazing interface by titanium positive ions and oxygen negative ions, and that the capacitance of the layer was gradually decreased with the growing reaction layer. It was considered that titanium positive ions and oxygen negative ions are combined to form an electrical neutral reaction layer. These experimental results were analyzed from the point of view of transient phenomena in electric circuits. Calculation results agreed with the decreasing capacitance of the electric double-layer.

    DOI： 10.2320/matertrans1989.39.1007

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  • Role of the reaction product in the solidification of Ag-Cu-Ti filler for brazing diamond

    Takahisa Yamazaki, Akio Suzumura

    J. Mater. Sci.   33 ( 5 )   1379 - 1384   1998

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  • Role of the reaction product in the solidification of Ag-Cu-Ti filler for brazing diamond

    Takahisa Yamazaki, Akio Suzumura

    J. Mater. Sci.   33 ( 5 )   1379 - 1384   1998

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Presentations

  • Influence of ply direction to brazed joint of C/C composites and pure titanium

    2010 

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  • The Influence of Gap Clearance to Joint Strength of Four-Pipe Brazed Specimen for Rocket Nozzle Skirt Assy

    2010 

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  • Influence of Concentration of ZnCl2 in Flux to Wettability of Al-Si Brazing Filler on SUS304 Stainless Steel

    2010 

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  • C/C複合材料と純チタンろう付に及ぼす席双方向の影響

    溶接学会全国大会平成22年度春季大会  2010 

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  • ロケットスカートノズルアッシィ用四管束試験片ろう付継手部の強度と接合部間隙の関係

    溶接学会全国大会平成22年度春季大会  2010 

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  • フラックス中の塩化亜鉛濃度とSUS304ステンレス鋼表面のAl-Siろう材のぬれ性

    溶接学会全国大会講演概要86集（平成22年度春季大会）  2010 

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  • ナノクラスターダイヤモンド分散ta-C膜のラマン分光分析による評価

    トライボロジー会議 東京2010-5  2010 

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  • Joining of surface modified diamond to Fe-42Ni alloy using Zn-5Al solder

    9th International Conference LOT 2010  2010 

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  • Brzing of C/C composites and titanium alloys with inserting OFHC copper foil

    Brazing, Hight Temperature Brazing and Diffusion Bonding LOT2010  2010 

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  • Role of valence electron of vanadium carbide in metallization of diamond surface

    International Brazing and Soldering Conference  2009 

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  • Brazing of Copper-coated Carbon/Carbon Composites to Titanium Alloys

    International Brazing and Soldering Conference  2009 

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  • Joining of surface modified diamond to Fe-42Ni alloy using Zn-5Al solder

    9th International Conference LOT 2010  2010 

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  • Brzing of C/C composites and titanium alloys with inserting OFHC copper foil

    Brazing, Hight Temperature Brazing and Diffusion Bonding LOT2010  2010 

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  • A-TIGによるSUS３１６L溶接部の組織と水素透過後の影響

    平成22年度春季全国大会  2010 

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  • Brazing of Copper-coated Carbon/Carbon Composites to Titanium Alloys

    International Brazing and Soldering Conference  2009 

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  • C/C複合材料とTi合金のろう付け強度とろう材の浸透現象

    平成21年度秋季全国大会  2009 

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  • Survey on hydrogen permeation paths in stainless steel SUS304 welded by TIG

    Preprints of the national meeting of J.W.S.  2008 

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  • Adherent Sn/57Bi solder alloy-melt on Cu cone plate at various shear velocities

    8th International Welding Symposium  2008 

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    Presentation type：Poster presentation  

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  • Robustness of Micro-Mechanical Joining for Micro Copper Wire

    8th International Symposium  2008 

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  • SUS304ステンレス鋼溶接部における水素透過経路の探査

    平成20年度秋季全国大会  2008 

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  • Adherent Sn/57Bi solder alloy-melt on Cu cone plate at various shear velocities

    8th International Welding Symposium  2008 

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    Presentation type：Poster presentation  

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  • Robustness of Micro-Mechanical Joining for Micro Copper Wire

    8th International Symposium  2008 

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  • CuメタライズしたC/C複合材とTiのろう付

    第８３回軽構造接合加工研究委員会  2008 

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  • Brazing joint strength of C/C composites and Ti alloys and infiltration of active brazing filler metal

    National Meeting of J.W.S, Automn, 2009  2009 

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  • Role of valence electron of vanadium carbide in metallization of diamond surface

    International Brazing and Soldering Conference  2009 

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  • Hydrogen Shielding film with self-healing function coated on stainless steel

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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    Presentation type：Poster presentation  

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  • Hydrogen permeation characteristics of welded 316 stainless steel using nickel welding filler

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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    Presentation type：Poster presentation  

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  • Applicability of MSCoating to Titanium Aluminaide Substrate - New Coating and Cladding Technology Using Electro-Discharge Energy -

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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    Presentation type：Poster presentation  

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  • Active-Transient Liquid Phase (A-TLP) bonding process for metal matrix composite

    2007 

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  • Brazing between dissimilar metals/alloys of stainless steel and aluminum alloys in the air

    2007 

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  • Microstructure, Strength and Corrosion Resistance of Brazu Pressure Welded Joint of Stainless Steel Pipe

    The 15th Materials and Processing Conference (M&P2007)  2007 

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  • Investigation of Interfacial Energy of Sn-Bi Solder-melt with respect to Viscosity

    The 15th Materials and Processing Conference (M&P2007)  2007 

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  • Improvement of wettability and joint strength using Sn-In-Al-Si-V solder for diamond

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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  • Hydrogen Shielding film with self-healing function coated on stainless steel

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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    Presentation type：Poster presentation  

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  • Hydrogen permeation characteristics of welded 316 stainless steel using nickel welding filler

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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    Presentation type：Poster presentation  

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  • Improvement of wettability and joint strength using Sn-In-Al-Si-V solder for diamond

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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  • Applicability of MSCoating to Titanium Aluminaide Substrate - New Coating and Cladding Technology Using Electro-Discharge Energy -

    Brazing, High Temperature Brazing and Diffusion Welding  2007 

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    Presentation type：Poster presentation  

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  • 金属基複合材料の活性液相拡散(A-TLP)接合

    日本機械学会2007年度年次大会  2007 

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  • ステンレス鋼とアルミニウム合金の異材間大気中ろう付け

    日本機械学会2007年度年次大会  2007 

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  • ステンレス鋼ろう付け圧接部の組織と強度および耐食性

    日本機械学会第15回機械材料・材料加工技術講演会  2007 

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  • Sn-Bi はんだの動粘性測定と界面エネルギの検討

    日本機械学会第15回機械材料・材料加工技術講演会  2007 

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  • Research on micro mechanical joining for fixing of fine copper line on electrical terminal

    2006 

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    Presentation type：Poster presentation  

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  • Development of interlayer metal suitable for Braze Pressure welding using induction heating for joining of stainless steel pipes

    2006 

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    Presentation type：Poster presentation  

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  • 銅細線の端子固定用マイクロメカニカル接合法の研究

    第14回機械材料・材料加工技術講演会  2006 

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  • 高周波誘導加熱を用いたステンレス鋼管のろう付圧接に最適なろう材の開発

    第14回機械材料・材料加工技術講演会  2006 

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Works

  • ナノクラスターダイヤモンド分散DLC膜に関する研究

    2006 - 2007

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    Work type：Artistic work  

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Awards

  • 日本機械学会畠山賞

    1991  

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    Country：Japan

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