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Microstructure and Electrochemical Corrosion Behavior of Fe-Cr System Alloys as Substitutes for Ni-Based Brazing Filler Metal

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Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 697-706页

作者： kangdao shi takahiro tsunoda ikuo shohji kotaro matsu yasuhiro taguchi Graduate School of Engineering Gunma UniversityKiryuGunma 376-8515Japan Graduate School of Science and Technology Gunma UniversityKiryuGunma 376-8515Japan Tokyo Braze Co LtdShikiSaitarma 353-0001Japan

Two new Fe-Cr system alloys,Fe-20Cr-43Ni-10P（mass%）and Fe-20Cr-20Ni-8P-5Si-2Mo（mass%）,have been developed as substitutes for the expensive Ni-based brazing filler metal used in brazing exhaust gas recirculation *** microstructures and melting properties of the alloys were analyzed by electron probe X-ray microanalyzer and differential scanning *** electrochemical characteristics of the alloys were investigated by potentiodynamic polarization testing in an electrolyte solution made in accordance with the standards of the Automobile Manufacturers Association of ***,the corrosion behaviors of the alloys were investigated by constant-potential polarization testing and surface *** is found that both alloys are composed of solid-solution phases and phosphide *** solid-solution phases serve as the anode,and the phosphide phases serve as the cathode in the corrosion reaction for both ***-20Cr-43Ni-10 P exhibits galvanic corrosion on the entire *** contrast,Fe-20Cr-20Ni-8P-5Si-2Mo is attacked at a few localized areas so that the cavities form on the *** corrosion potential（E_（corr）） is lower than that of Ni-29Cr-6P-4Si（mass%）for both *** means that the Fe-Cr system alloys are more easily corroded than *** corrosion rate and corrosion resistance cannot be investigated by the corrosion current density（i_（corr）） and polarization resistance（R_p）,respectively,because of localized corrosion of the two alloys.

关键词： Iron-chromium system alloy Microstructure Electrochemical corrosion Brazing

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Thermodynamic reassessment of Ni–Ga binary system

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Rare Metals 2015年第12期34卷 864-872页

作者： Zhan-Min Cao Xian shi Wei Xie ikuo Ohnuma Kiyohito Ishida Zhi-Yu Qiao State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Department of Materials Science Graduate School of Engineering Tohoku University

New experimental measurements of the phase diagram and the mixing enthalpy of liquid phase along with the previous experimental data were used in a reassessment of the Ni–Ga system. A set of self-consistent thermodynamic parameters of the Ni–Ga system is obtained using the calculation of phase diagram (CALPHAD) technique, and the available phase diagram and thermodynamic data are reproduced well within experimental error limits. Some noticeable improvements are obtained in the present work compared with the previous assessment: (1) the calculated Ga-rich liquidus is more reasonable; (2) Ni3Ga7 is adopted as the most Ga-rich compound rather than NiGa4; (3) the Ni5Ga3 phase is treated as the nonstoichiometric compound with consideration of its narrow homogeneity range; (4) the phase transformation between B81.5_Ni3Ga2 and Ni13Ga9 is considered instead of treating them as Ni3Ga2 phase simply; (5) the latest experimental data of mixing enthalpy for the liquid phase are adopted. The present study can be used as a basis for the development of a thermodynamic database of the Ni-based semiconductor alloy systems.

关键词： Ni–Ga system CALPHAD technique Thermodynamic reassessment Phase diagram

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Mice-lacking LMP2, immuno-proteasome subunit, as an animal model of spontaneous uterine leiomyosarcoma

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Protein & Cell 2010年第8期1卷 711-717页

作者： Takuma Hayashi Akiko Horiuchi Kenji Sano Nobuyoshi Hiraoka Yae Kanai Tanri shiozawa Susumu Tonegawa ikuo Konishi Department of Immunology and Infectious Disease Shinshu University Graduate School of MedicineMatsumotoNagano 390-8621Japan Department of Obstetrics and Gynecology Shinshu University School of MedicineMatsumotoNagano 390-8621Japan Department of Laboratory Medicine Shinshu University HospitalMatsumotoNagano 390-8621Japan Pathology Division National Cancer Center Research InstituteTokyo 104-0045Japan Picower Institution and Department of Biology Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Department of Obstetrics and Gynecology Kyoto University Graduate School of MedicineSakyo-kuKyoto 606-8501Japan Promoting Business using Advanced Technology Japan Science and Technology Agency(JST)Kawaguchi-shiSaitama 332-0012Japan

Uterine tumors are the most common type of gynecologic *** leiomyosarcoma(LMS)is rare,accounting for 2%to 5%of tumors of the uterine *** LMS develops more often in the muscle tissue layer of the uterine body than in the uterine *** development of gynecologic tumors is often correlated with female hormone secretion;however,the development of uterine LMS is not substantially correlated with hormonal conditions,and the risk factors are not yet *** evaluation combined with PET/CT can be useless in the diagnosis and surveillance of uterine ***,a diagnostic biomarker,which distinguishes malignant LMS and benign tumor leiomyoma(LMA)is yet to be ***,it is necessary to analyze risk factors associated with uterine LMS in order to establish a method of ***2-deficient mice spontaneously develop uterine LMS,with a disease prevalence of~40%by 14 months of *** is therefore of interest whether human uterine LMS shows a loss of LMP2 *** found LMP2 expression is absent in human LMS,but present in human ***,defective LMP2 expression may be one of the risk factors for ***2 is potentially a diagnostic biomarker for uterine LMS,and gene therapy with LMP2-encording DNA may be a new therapeutic approach.

关键词： LMP2 uterine leiomyosarcoma uterine leiomyoma diagnostic biomarker

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3-甲基胆蒽对大鼠肝细胞细胞色素P4501A的诱导作用

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卫生毒理学杂志 2003年第3期17卷 152-154页

作者：王堃仲来福 shiNDOH Hideto-shi INOUE Tomoa-ki HORII ikuo 大连医科大学药理教研室辽宁大连116027 大连医科大学卫生学教研室辽宁大连116027 日本罗氏研究所临床前科学部

目的　研究 3 甲基胆蒽 (3 methylcholanthrene,3 MC)对原代培养大鼠肝细胞细胞色素P450 1A(CYP 1A)酶活力的诱导作用 ,并探讨其时间效应和剂量效应关系。方法　原位 2步胶原酶灌流法分离大鼠肝细胞 ,无血清条件下培养细胞 ,并用不... 详细信息

目的　研究 3 甲基胆蒽 (3 methylcholanthrene,3 MC)对原代培养大鼠肝细胞细胞色素P450 1A(CYP 1A)酶活力的诱导作用 ,并探讨其时间效应和剂量效应关系。方法　原位 2步胶原酶灌流法分离大鼠肝细胞 ,无血清条件下培养细胞 ,并用不同剂量的 3 MC诱导肝细胞 2 4h或 48h。乙氧基试卤灵 (ethoxyresorufin,EOR)为CYP 1A酶活力探针药 ,高效液相色谱法 (HPLC)测定试卤灵 (resorufin,RSF)浓度。结果　实验条件下对照组和 3 MC诱导组的RSF均可被检测 ,与对照细胞相比 ,除 0 0 0 5μmol L的 3 MC对原代培养大鼠肝细胞EROD无显著诱导作用外 ,其余剂量 (0 0 5 ,0 5 ,5μmol L)的 3 MC均明显诱导酶活力 ,酶活力分别被上调至对照组的 5 0 8,2 3 3 ,33 6倍 (P <0 0 1 ) ,3 MC的诱导作用在 2 4h达最强 ,而其在 48h的诱导作用与 2 4h相似。3 MC对原代培养大鼠肝细胞CYP 1A酶活力的诱导作用呈明显的剂量依赖性。结论　 3 MC对大鼠原代培养肝细胞CYP

关键词： 3-甲基胆蒽大鼠细胞色素P4501A 诱导作用原代培养肝细胞高效液相色谱法剂量依赖性

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