巻号一覧
58 巻, 10 号
October
選択された号の論文の15件中1～15を表示しています
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特集：グリーン・プロセッシングによる機能性粉体の合成と応用
総報
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鈴木 久男2011 年 58 巻 10 号 p. 570
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスPDF形式でダウンロード (146K)
受賞記念講演
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— 非平衡微粒子からサイズ制御クラスター・ナノ粒子へ —隅山 兼治2011 年 58 巻 10 号 p. 571-577
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスThe author reviewed his research works on clusters and nano-particle assemblies, which were motivated by metastable structures and Kubo effects (quantum size effects) in ultra-fine particles. He studied (1) magnetic and electrical properties of granular alloy films prepared by the ion-cluster-beam method, (2) magnetic and electronic properties of nonequilibrium transition metal fine particles prepared by the mechano-chemistry method, (3) size-controls and physical properties of metal and alloy clusters prepared by plasma-gas-condensation methods, (4) forming abilities of core-shell clusters and composites of different metal clusters via gas phase routes, and (5) size-controls and physical properties of transition metal nanoparticles and noble metal-sulfide nano-particles prepared via colloidal liquid phase routes.抄録全体を表示PDF形式でダウンロード (972K)
研究
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松本 勇磨, 冨田 恒之, 関根 嘉香, 垣花 眞人2011 年 58 巻 10 号 p. 578-583
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスWe prepared NaTaO3 by hydrothermal method and solvothermal method. Na2Ta2O6 was obtained by hydrothermal treatment of water soluble tantalum complex and NaOH. On the other hand NaTaO3 was obtained by solvothermal treatment of TaCl5 and NaOH in methanol. Many samples were synthesized in various hydrothermal condition, however all samples were Na2Ta2O6 or amorphous. Primary particle size of samples obtained by solvothermal method was 10 nm. Primary particles aggregated and formed 20-50 nm secondly particles. Moreover, specific surface area of NaTaO3 synthesized by the solvothermal method was 109 m2/g. Therefore we succeeded in obtaining NaTaO3 fine particles with high specific surface area. NaTaO3 sample loaded NiO of 6 wt% produced H2 of 600 μmol/h. When solvothermal treatment time was extended from 5 hours to 10 hours and stirring in solvothermal treatment, water splitting activity of NaTaO3 was improved.抄録全体を表示PDF形式でダウンロード (1453K) -
山本 和広, 松島 聡, 冨田 恒之, 三浦 恭之, 垣花 眞人2011 年 58 巻 10 号 p. 584-590
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスWater-soluble titanium complexes are attractive titanium sources for solution synthesis of titanium-based materials using water as a solvent due to their high stability in aqueous solution in wide range of pH, and have been made from expensive metal titanium ultrafine powder. In this study, TiCl4 and Ti(SO4)2 that are inexpensive reagents than metal titanium fine powder were chosen as starting materials. TiCl4 and Ti(SO4)2 were dropped into distilled water and large amount of NaOH solution was added here, then precipitates of Ti(OH)4 were obtained. Then precipitates were washed with distilled water and dissolved into mixed solution of H2O2 and NH3. And lactic acid as complexing agent was added to the solutions to obtain water-soluble titanium lactate complex solutions. These complex solutions generated no precipitate at pH 0 to 12 for 6 months. Yields of Ti in the both processes were 85 % and removal ratios of Cl- and SO42- ions were 99 and 93 %, respectively. MCO3 (M=Ca2+, Sr2+, Ba2+) were dissolved in the complex solution prepared from TiCl4, and the solution was dried and heated at 873 K for 5 h. Very fine and crystalline particles of CaTiO3, SrTiO3 and BaTiO3 were obtained by heating at 873 K in this solution method, while large particles of CaTiO3, SrTiO3 and BaTiO3 were obtained at 1273 K in solid-state reaction. Low temperature synthesis of titanium complex oxides by a new synthetic route of water-soluble titanium complex from titanium chloride and titanium sulfate as starting materials was successfully achieved.抄録全体を表示PDF形式でダウンロード (1240K) -
Newaz Mohammed Bahadur, Hironori Takaoka, Takeshi Furusawa, Fumio Kura ...2011 年 58 巻 10 号 p. 591-597
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスA rapid process of silica coating of colloidal copper nanoparticles by microwave method was studied. Copper nanoparticles were prepared from CuCl2 aqueous solution using hydrazine as reducing agent and cetyltrimethylammonium bromide and citric acid as stabilizers. Obtained copper nanoparticles having the mean diameter of around 30 nm were surface-treated by 3-aminopropyltriethoxysilane and then surface-coated with silica using tetraethoxysilane or silanol terminated polydimethylsiloxane as silica precursors. The uncoated and silica coated copper nanoparticles were characterized by UV-Vis spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction measurements. By varying several conditions, Cu nanoparticles could be coated with uniform silica shell with the reaction time, i.e. the microwave irradiation time, of only 5 min, although single core containing core-shell nanoparticels could not be obtained. Conclusively, this microwave method is one of the green processes for its short reaction time.抄録全体を表示PDF形式でダウンロード (1151K) -
稲田 幹, 古賀 貴寛, 田中 優実, 榎本 尚也, 北條 純一2011 年 58 巻 10 号 p. 598-601
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスRice chaff can be converted into activated carbon by alkaline treatment at high temperature. In this study, we tried to synthesize activated carbon from rice chaff by microwave hydrothermal treatment with NaOH solution. Rice chaff was heated at 700°C for 1 h in N2 after HCl treatment to remove impurity, such as alkali metals, resulting in the formation of charcoal. The charcoal was mixed with NaOH aqueous solution, and then heated at 100°C under microwave irradiation. After heating, the product was separated by filtration, washed with deionized water and dried at 50°C. The specific surface area of product was 1060 m2/g under microwave irradiation and 690 m2/g by conventional heating with autoclave, which indicates that microwave hydrothermal treatment is effective for activation of charcoal.抄録全体を表示PDF形式でダウンロード (397K) -
Bruce Lindsley, W. Brian James, Tony Nishida, Kalathur S. Narasimhan2011 年 58 巻 10 号 p. 602-608
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスThere is a growing need in the PM industry for materials with reduced or no Cu or Ni and also lesser total alloying elements to minimize costs. Towards this end, a variety of research activities have been undertaken and this manuscript is a report on Cu-free and Nickel-free steels that have been developed. The combination of Mn with a moderate level of Mo results in PM steel alloys with mechanical properties approaching and/or surpassing those of the diffusion alloy FD-0405. Equally important, these alloys can be processed under typical, industrial sintering conditions. With accelerated cooling, these manganese steels can be used as lean alloy, sinter-hardening grades. The benefits of ferrous PM alloys containing manganese are discussed.抄録全体を表示PDF形式でダウンロード (1858K)
研究速報
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佐々木 詩織, 楠本 直子, 坂元 尚紀, 脇谷 尚樹, 鈴木 久男, 宮崎 英敏, 太田 敏孝2011 年 58 巻 10 号 p. 609-613
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスW doped VO2 nano coating on the SiO2 particles were examined with controlling the process parameter, by sol-gel method. Residual water in VO2-SiO2 hybrid sol was evaporated at 150°C, and residual organic matter was burned at 250°C. As a result, VO2 phase was obtained with the 83 % concentration in Vanadium oxides. Additionally, a tungsten doping method into VO2-SiO2 particles was investigated by changing solvents. Using 2-Methoxyethanol for the solvent, W-doped VO2-SiO2 particles with the W atomic% of 1.8 were obtained, and the transition temperature of the resulting particles was 53°C.抄録全体を表示PDF形式でダウンロード (550K)
研究
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荻原 隆, 赤尾 信介2011 年 58 巻 10 号 p. 614-618
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスSpinel type of LiNi0.5Mn1.5O4 cathode materials were continuously prepared by two-fluid type of spray pyrolysis. As-prepared powders had spherical morphology with porous microstructure which had an average diameter of 3.7 μm with broad size distribution. The particle morphology of LiNi0.5Mn1.5O4 powders was influenced by the calcination and the polygonal morphology was obtained at 1000°C. XRD showed that LiNi0.5Mn1.5O4 was well crystallized after the calcination at 700°C. The electrochemical measurement of LiNi0.5Mn1.5O4 cathode showed that the long plateau was observed at 4.7 V in rechargeable curve of LiNi0.5Mn1.5O4 cathode and its discharge capacity was 145 mAh/g at 1 C. The capacity retention of LiNi0.5Mn1.5O4 cathode was 95 % at 1 C after 100 cycles. The discharge capacity and capacity retention of LiNi0.5Mn1.5O4 cathode was 125 mAh/g and 88 % at 20 C, respectively. LiNi0.5Mn1.5O4 cathode exhibited also stable cycle performance at 50°C.抄録全体を表示PDF形式でダウンロード (621K) -
赤尾 信介, 荻原 隆, 小寺 喬之, 明神 賢一2011 年 58 巻 10 号 p. 619-624
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスLiFePO4/C cathode materials were prepared by spray pyrolysis, and the effect of carbon source and calcination condition on powder characteristics and battery properties of the materials were studied. Homogeneous olivine LiFePO4 powders were formed from all carbon sources, and carbon contents of LiFePO4/C particles prepared from fructose or sucrose were high due to their high pyrolysis temperature. Particle morphology was changed according to carbon source, and crystal growth was promoted by increasing calcination temperature. Carbon layers were observed on the surface of LiFePO4/C particles. Battery properties were improved by increasing carbon content of LiFePO4/C particles, but the properties also depended largely on their particle size. So it revealed that the discharged capacity of LiFePO4/C cathode was maximized when both their carbon content and particle size showed optimum value. The discharged capacity of LiFePO4/C cathode prepared from sucrose exhibited 153 mAh/g at 1 C when it was calcined at 750°C for 3 hr.抄録全体を表示PDF形式でダウンロード (967K) -
Atsushi Hibino, Yuhei Sumiyoshi, Kuniyuki Hayashi2011 年 58 巻 10 号 p. 625-632
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスTo realize the TiAl intermetallic compounds by the combustion synthesis process, the mechanical property of the product should be improved. As the remedial measures, it is said that complex microstructure controlling was effective for the TiAl intermetallic compound. In this paper, the combustion synthesis of the Ti-Ni-Al complex intermetallic compounds was attempted, and the microstructure and the mechanical properties of the synthesized products were investigated.
Elemental Ti, Ni, and Al powders were mixed, and the compact made from the mixed powder was reacted by thermal explosion combustion synthesis. However, the heat of reaction was too large, the product melted and the sintered compound could not be obtained. For the some compacts, though the anneal treatment of the compact was performed to reduce the heat of reaction, the product still melted. Therefore, the mixing ratio of the powders was controlled, and the combustion synthesis was performed. For the complex intermetallic compounds obtained, the microstructure, the phases and the mechanical properties were discussed.抄録全体を表示PDF形式でダウンロード (1663K) -
岩岡 拓, 藤木 章2011 年 58 巻 10 号 p. 633-639
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスThe disused car scrap with the copper wire etc. is crushed together, and dissolved in an electric furnace. The removal of copper from the steel scrap that is thus inevitably contained high copper is difficult. Because the copper causes surface hot-shortness during hot rolling of steel, it is usually considered as a harmful tramp element. In powder metallurgy, the processing of recycling copper rich scrap was studied. Although the obtained materials showed high strength, this processing is not cost-effective for high-volume production.
Therefore, we focused on the conventional compacting-sintering in order to recycle high-copper steel scrap efficiently. The mixture of gas-atomized Fe-4mass%Cu powder, pure iron powder and graphite was compacted with the die wall lubricating method. The obtained green compacts were sintered at 1423 K for 1.8 ks in an argon atmosphere. The transverse rupture strength and sintered density were 500 MPa and 7.0 Mg/m3 respectively though the pearlite was hardly observed compared with standard Fe-Cu-C type sintered materials. Thus there is still room for improvement in strength property of the alloyed powder mixture obtained from the conventional process. In conclusion, the possibility of high-copper scrap recycling using conventional powder metallurgy was found.抄録全体を表示PDF形式でダウンロード (1934K)
本会記事
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2011 年 58 巻 10 号 p. Pref10_1
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスPDF形式でダウンロード (61K) -
2011 年 58 巻 10 号 p. Mtg10_2-Mtg10_6
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスPDF形式でダウンロード (263K) -
2011 年 58 巻 10 号 p. MtgPr10_1-MtgPr10_22
発行日: 2011年
公開日: 2011/12/22
ジャーナル オープンアクセスPDF形式でダウンロード (675K)
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