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131.
Yoshikazu Takaku Ikuo Ohnuma Ryosuke Kainuma Yasushi Yamada Yuji Yagi Yuji Nishibe Kiyohito Ishida 《Journal of Electronic Materials》2006,35(11):1926-1932
Bismuth and its alloys are candidates for Pb-free high-temperature solders that can be substituted for conventional Pb-rich
Pb−Sn solders (melting point (mp) = 573 – 583 K). However, inferior properties such as brittleness and weak bonding strength
should be improved for practical use. To that end, BiCu−X (X=Sb, Sn, and Zn) Pb-free high-temperature solders are proposed.
Miscibility gaps in liquid BiCu−X alloys were surveyed using the thermodynamic database ADAMIS (alloy database for micro-solders),
and compositions of the BiCu−X solders were designed on the basis of calculation. In-situ composite solders that consist of
a Bi-base matrix with fine intermetallic compound (IMC) particles were produced by gas-atomizing and melt-spinning methods.
The interfacial reaction between in-situ composite solders and Cu or Ni substrates was investigated. The IMCs at the interface
formed a thin, uniform layer, which is an appropriate morphology for a reliable solder joint. 相似文献
132.
Tetsushi N. Deura Tomoya Matsunaga Ryosuke O. Suzuki Katsutoshi Ono Masahiro Wakino 《Metallurgical and Materials Transactions B》1998,29(6):1167-1174
A process to produce titanium powder continuously is proposed and its applicability is examined experimentally. The method
is based on the chemical reaction in the conventional Kroll reduction process; however, TiCl4 gas is injected into molten salt on which a molten magnesium layer is floated as the reductant. Bubbles of gaseous TiCl4 can be reacted at the lower surface of the liquid Mg layer, while TiCl4 gas reacts on the upper surface in the Kroll process. The fine Ti particles produced in this study were well separated from
magnesium and could be recovered from the bottom of the molten salts. The particles were small and fine enough for use in
powder metallurgy, while congregated lumps of about 20 μm in size are obtained by the Kroll process. The composition of molten
salts and an operation temperature above 1073 K did not affect the morphology of the Ti particles, if suitable material for
the reaction vessel was chosen. 相似文献
133.
134.
Cui Ping Wang Xing Jun Liu Ikuo Ohnuma Ryosuke Kainuma Kiyohito Ishida Shi Ming Hao 《Journal of Phase Equilibria》2000,21(1):54-62
Phase equilibria in the Cu-Fe portion of the Cu-Fe-Mo and the Cu-Fe-Nb systems, in the temperature ranges 1073 to 1573 K and 1373 to 1573 K, respectively, were determined by metallography and scanning electron microscopy-energy dispersive x-ray methods. Based on the present experimental data combined with the previous assessments of the component binary systems, thermodynamic calculations of phase equilibria were carried out adopting the subregular solution model to describe the Gibbs energies of the liquid, bcc, and fcc phases. The evaluated thermodynamic parameters lead to a better fit between calculations and experimental data in both the Cu-Fe-Mo and Cu-Fe-Nb systems. 相似文献
135.
Mingyuan Wang Francisco J. Argüelles-Vivas Ryosuke Okuno 《American Institute of Chemical Engineers》2021,67(5):e17166
This article presents an improved method for the determination of saturation pressure from pressure-volume data of constant-mass expansion (CME) for hydrocarbon mixtures. The conventional methods rely on the direct observation of an incipient phase and/or the change in total compressibility of the fluid sample near the saturation pressure in CME; however, they are unreliable for volatile oils, gas condensates, and near-critical fluids. The method developed in this research is to capture the expansion behavior of the overall fluid through the attraction and covolume parameters of the Peng–Robinson equation of state. The reliability of the new method is demonstrated by comparing it with the conventional methods in the case studies using 59 different fluids. It was the only method that could reliably identify saturation pressures for five volatile oils, 11 gas condensates, and one near-critical fluid among the datasets tested. 相似文献
136.
Metallurgical and Materials Transactions B - This work presents a new processing concept for production of Ti metal powder from FeTiO3via TiN and TiSx. Because FeTiO3 can be converted to TiN by the... 相似文献
137.
138.
139.
Xiangning Meng Takeyuki Fujisaka Ryosuke O. Suzuki 《Journal of Electronic Materials》2014,43(6):1509-1520
The performance of a three-dimensional helical thermoelectric generation (TEG) system is examined by exposing it to a temperature difference with hot and cold sources. The helical paths for the two thermal fluids give the TEG device the potential to efficiently convert thermal energy. The characteristic performance of the helical system is numerically analyzed by using the finite-volume method in a compact system. The helical system is compared with a straight system in which all the thermoelectric (TE) elements present equivalent geometry. The difference in the TE performance between the two systems is not significant when the TE surfaces are maintained at constant temperatures. Both the electromotive force and the current in the TEG system increase linearly with the temperature difference ΔT applied at the two module surfaces. The current preferentially flows through a main path determined by the geometry of the TE element. The merits of the helical design are its compactness, space saving, and smooth fluid flow due to gravity, compared with the straight system. 相似文献
140.