Faculty Profiles - OTSUBO Fumitaka

Papers - OTSUBO Fumitaka

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Solidification Structure of Al-Cu and Sn-Cu-Sb Alloys Obtained by Casting through Induction Stirring Using Permanent Magnet Reviewed

55 ( 5 ) 806 - 812 2014.05

Spheroidal Graphite Formation in Ni-C Alloy

B4-1 2013.12

Thermal Conduction Simulation and Structure Formation of SGI During Heating by Running Induction Coil

B5-3 2013.12

Reproduction of matallographic structure of ancient cast iron

H-07 - H-07 2013.10

Microstructure and Heat Transfer Simulation of SGI Press Forming Dies by Induction Hardening

36 - 38 2013.09

Formation of Spheroidal Graphite in Nickel Alloy

79 - 81 2013.09

Measurement of Viscosity of Non-combustible Molten Magnesiumu Alloy "jointly worked" Reviewed

Journal of Japan Foundry Engineering Society 83 ( 10 ) 569 - 573 2011.10

Crystallographic Observation for Au/Au Bond Interface by Ultrasonic Bonding Reviewed

Journal of Japan Institute of Elactronics Packaging 12 ( 4 ) 307 - 312 2009.07

Crystallographic Observation for Au/Au Bond Interface by Ultrasonic Bonding Reviewed

SOGAWA Mitsuomi, OTSUBO Fumitaka, YAMAGUCHI Tomiko, NISHIO Kazumasa, ERA Hidenori

Journal of The Japan Institute of Electronics Packaging ( Japan Institute of Electronics Packaging ) 12 ( 4 ) 307 - 312 2009.07

Language：English Publishing type：Research paper (scientific journal)

A crystallography study and observation of microstructure were carried out on the joint of an Au ball and Au electrode formed using two modes of ultrasonic bonding which show differences under the life test. A non-bonded joint was seen on the samples using SEM observation. Also, it was found that the length of bonding of the LP sample, which was bonded using low ultrasonic output, was short compared with that of the HP sample, which was bonded using high ultrasonic output. From an analysis of the IPF image obtained using EBSD, the interface of the joint in the LP sample apparently retained the crystal orientation of the interface before bonding. However, {001} in the HP sample, the crystal grain formed parallel to the bonded plane in the newly formed large area without obvious interface from the joint. It was concluded from this that the crystal grain having the same axis as the Au ball formed in the Au electrode though the orientation was not obvious from SEM and TEM observation.

DOI： 10.5104/jiep.12.307

Scopus

CiNii Article

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84871181779&origin=inward

Sealing Oxides of Thermal sprayed Alumina Coating and Its Formation Process Reviewed

OTSUBO Fumitaka, KOZASA Nobuhiro, SHINOZAKI Nobuya, ERA Hidenori, KISHITAKE Katsuhiko

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 26 ( 2 ) 195 - 201 2008.12

Language：English Publishing type：Research paper (scientific journal)

The sealing of pores by a veined oxide in a thermal sprayed alumina coating with some kinds of metal particle was investigated by heating in air. Also, the oxide grew from the metallic substrate into an artificial pore in the alumina block was observed after heating in air. The sealing of pores arose by the spinel oxide in the alumina coating containing Ni, Co or NiCrAlY particles after heating at 1173K for 100h in air. The oxide grew from Ni substrate into the artificial pore in alumina block after heating at 1273K for 100h in air. The oxide formed from the Ni substrate in the pore consisted of NiO (core) and NiAl2O4 spinel oxides. Also, the NiAl2O4 spinel formed from the top of the grown oxide on the surface of the pore. The spinel oxide preferentially forms on the surface of the pore and the primary oxide of the metal occupies the remaining space in the pore.

DOI： 10.2207/qjjws.26.195

Scopus

CiNii Article

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=70449337622&origin=inward

Sealing Oxides of Thermal Sprayed Alumina Coating and Its Formation Process Reviewed

Quarterly Journal of the Japan Welding Society 26 ( 2 ) 195 - 201 2008.04

Formation of Ni3Al in Sprayed Coating of Ni-Al Composite Powder by Heat-Treatment Reviewed

Journal of Japan Thermal Spray Society 44 ( 3 ) 83 - 87 2007.07

Super Elongation of High Purity Al-Si Alloy Castings Reviewed

T. Ogawa,K. Kimura,Y. Koga,F. Otsubo,H. Era

Proceedings of The 16th International Microscopy Congress 3 '1676 - 1676 2006.09

Residual Stress Distribution in Thermally Sprayed Self-Fluxing Alloy Coatings Reviewed

Journal of Japan Thermal Spray Society 43 ( 2 ) 42 - 46 2006.04

固有ひずみ法による球状黒鉛鋳鉄溶接部の残留応力分布測定 Reviewed

原田浩次，大坪文隆，寺崎俊夫，岸武勝彦

鋳造工学 78 ( 1 ) 9 - 13 2006.01

Residual Stress Distribution in Thermally Sprayed Self-Fluxing Alloy Coatings Reviewed

F.Otsubo,K.Kishitake,T.Terasaki

Materials Transactions 46 ( 11 ) 2473 - 2477 2005.11

Corrosion Resistance of Fe-16%Cr-30%Mo-(C,B,P) Amorphous Coatings Sprayed by HVOF and APS Processes Reviewed

F.Otsubo,K.Kishitake

Materials Transactions 46 ( 1 ) 80 - 83 2005.01

Corrosion resistance of Fe-16%Cr-30%Mo-(C,B,P) amorphous coatings sprayed by HVOF and APS processes Reviewed

Otsubo F., Kishitake K.

Materials Transactions 46 ( 1 ) 80 - 83 2005.01

Corrosion resistance of Fe-Cr-Mo-(C,B,P) amorphous coatings thermal sprayed by HVOF and APS processes Reviewed

Otsubo F., Shimoda A., Era H., Kishitake K.

Proceedings of the International Thermal Spray Conference 439 - 441 2004.12

Language：English Publishing type：Research paper (international conference proceedings)

Two kinds of Fe-16Cr-30Mo-(C,B,P) alloy powders of different composition were thermal sprayed onto mild steel using HVOF and APS processes. Perfect amorphous coating was formed by HVOF and APS processes in both powders. The corrosion potential of the amorphous coatings sprayed by HVOF process was higher and the passive current density was lower than that of the amorphous coatings sprayed by APS process in 1N HCl solution. The coatings of perfect amorphous phase were little corroded after one week immersion tests and the corrosion rates of the amorphous coatings showed a fairly less value of 0.03 mm/y compared with Inconel 625 plate in 5N HCl solution at room temperature.

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=10444265930&origin=inward

ブラスト処理したフェライト基地球状黒鉛鋳鉄の曲げ特性 Reviewed

大坪文隆,岸武勝彦,寺崎俊夫

鋳造工学 76 ( 6 ) 469 - 472 2004.06

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Papers - OTSUBO Fumitaka