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Volume 62, Issue 3
March
Displaying 1-9 of 9 articles from this issue
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Paper
Paper
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Shunji KINOSHITA, Nobuya MACHIDA , Toshihiko SHIGEMATSU2015 Volume 62 Issue 3 Pages 81-92
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSABSTRACT
A composite of copper chevrel phase (Cu2Mo6S7.8) and sulfur was investigated as positive electrode materials for all-solid-sate lithium-sulfur batteries with an inorganic solid electrolyte (amorphous Li3PS4). The composites of Cu2Mo6S7.8 and sulfur in various mole ratios (Cu2Mo6S7.8 : S = 1 : 1 to 1 : 20) showed high specific capacities in the range of 200 to 480 mAhg−1, which was calculated on the base of the total weights of the composites. Those capacities were two to three times larger than that of the Cu2Mo6S7.8. The reaction mechanisms of the composite as cathode materials were investigated during the discharge process. First of all, only the mixing of Cu2Mo6S7.8 with sulfur caused a structural change of the chevrel phase (type 1) into type 1’ phase and a formation of copper sulfide (CuS). In the initial stage of the discharge process, lithium ions were electrochemically inserted into the type 1’ phase and CuS. The Li+ insertion into the CuS formed LixCuS phase. The newly formed LixCuS continuously reacted with elemental sulfur and changed into CuS and Li2S. This reaction was not electrochemical reaction, however, the generated CuS would be able to electrochemically react with farther lithium ions. This process caused the large electrochemical capacity of the composites. An all-solid-state battery with the composite of Cu2Mo6S7.8 and sulfur (1 : 7 in mole ratio) showed high specific capacity more than 250 mAhg−1 and the capacity was retained even after 30 discharge-charge cycles at 25 ˚C.View full abstractDownload PDF (2215K)
Special Issue: New Developments in Manufacturig Technology and Product Evaluation Using Powder Metallurgical Processes
Summarization
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Takashi ITOH2015 Volume 62 Issue 3 Pages 94-
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSDownload PDF (156K)
Review
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Mikio KONDOH2015 Volume 62 Issue 3 Pages 95-100
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSABSTRACT
We have developed the technique of warm compaction using lithium stearate as the die wall lubricant in order to obtain high density, 99 % theoretical or more, by means of a single compaction only. This technique achieves very low ejection force and enjoys epoch-making mass-production. High density is indispensable for a high performance powder metallurgical product. Unfortunately, the unavailability of superior lubricants allowed no compaction at high pressure. We have developed a specific lubricant formed by dispersing lithium stearate in water and succeeded in ultrahigh density powder compaction by means of die wall lubricated warm compaction.View full abstractDownload PDF (1310K)
Paper
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Kyoushi ADACHI, Akira FUJIKI2015 Volume 62 Issue 3 Pages 101-107
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSABSTRACT
This study measured the coefficients of friction on several lubricants for powder metallurgy with horizontally both-way sliding friction tester. We obtained the results that static coefficients of friction on those powder lubricants were from 0.21 to 0.45, and those kinetic coefficients of friction were from 0.13 to 0.25. Furthermore, the relationship between coefficients of friction and ejection pressures on several powder lubricants showed that low kinetic coefficient of friction tended to be low-ejection pressure, on mixed-type lubricants. The relationship between coefficients of friction and green density on them showed that low-static and kinetic coefficients of friction tended to be high-green density.View full abstractDownload PDF (1391K) -
Toshiko OSADA, Ryosuke SAKURAI, Ryuichi HASHIKAWA, Fujio TSUMORI, Hide ...2015 Volume 62 Issue 3 Pages 108-113
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSABSTRACT
Metal Injection Molding (MIM) process is suitable for fabricating small parts in large quantity. In this work,relatively large and complex shaped parts were prepared thorough MIM. In order to decrease the deformation of sintered parts, powders of different sizes were mixed. The effect of powder particle distribution and powder loading on the distortion of complex shaped compacts were investigated and evaluated. As smaller the particle size of mixed powder, tap density of powder were decreased. However, sintered density and shrinkage were increased. Although high powder loading increased the viscosity during the injection molding, decreased the shrinkage of sintered compact. From these results, smaller deformation of the large and complex shaped parts could be realized by using smaller particle size of mixed powder and higher powder loading.View full abstractDownload PDF (884K) -
Takashi ITOH , Akira TOMINAGA2015 Volume 62 Issue 3 Pages 114-119
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSABSTRACT
Magnesium silicide is a promising eco-friendly thermoelectric material. Its constituent elements are non-toxic and exist in abundance on the earth. To improve thermoelectric performance of the material, reduction of thermal conductivity is required. In this study, we attempted to lower the thermal conductivity of Al–doped Mg2Si by milling of the powder and addition of calcium oxide nanoparticles (CONP). Grain size distribution and thermoelectric properties in the sintered samples were measured. Furthermore, influence of CONP addition on grain growth was investigated after heat treatment at 500 ˚C for 50 h in an argon gas. Milling process was effective enough to grain refining, but CONP addition had little effect on it. The milling treated samples lowered the thermal conductivity regardless of CONP addition. The milling treated sample without CONP addition had the best thermoelectric performance of ZT = 1.15 at 600 ˚C. The samples with CONP addition, however, resulted in degradation of thermoelectric performance at high temperature. The heat treatment brought to the grain growth for the sample without CONP addition and resulted in degradation of thermoelectric performance, while the sample with CONP addition controlled the grain growth after the heat treatment and maintained the thermoelectric performance.View full abstractDownload PDF (1192K)
JSPM Announcement
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2015 Volume 62 Issue 3 Pages MtgPr3_2-MtgPr3_20
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSDownload PDF (628K) -
2015 Volume 62 Issue 3 Pages Pref3_1-
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSDownload PDF (934K)
Errata
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Kiyoshi Mizuuchi, Kanryu Inoue, Yasuyuki Agari, Tohru Nagaoka, Masami ...2015 Volume 62 Issue 3 Pages 123-
Published: March 15, 2015
Released on J-STAGE: April 11, 2015
JOURNAL OPEN ACCESSEratta
About the paper by Kiyoshi MIZUUCHI et al. published in the September 2012 issue of the Journal, the authors requested that an error of the referece in the original paper should be corrected.
p.563 left column, 2nd line from the bottom
(wrong)
19) K. Mizuuchi, K. Inoue, Y. Agari, T. Nagaoka, Y. Morisada, M. Sugioka, M. Tanaka, T. Takeuchi, J. Tani, M. Kawahara Y, Makino, and M Ito: "Processing and thermal properties of Al/SiC composites in continuous solid-liquid co-existent state by spark plasma sintering", Compos. Part B: Eng., 42 (2011) in press.
(right)
19) K. Mizuuchi, K. Inoue, Y. Agari, T. Nagaoka, Y. Morisada, M. Sugioka, M. Tanaka, T. Takeuchi, J. Tani, M. Kawahara Y, Makino, and M Ito: "Processing of Al/SiC composites in continuous solid-liquid co-existent state by SPS and their thermal properties", Compos. Part B: Eng., 43 (2012) 2012-2019.View full abstractDownload PDF (267K)
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