巻号一覧
61 巻, 2 号
February
選択された号の論文の9件中1～9を表示しています
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研究論文
研究論文
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角倉 孝典, 平岡 裕, 池ヶ谷 明彦2014 年 61 巻 2 号 p. 67-72
発行日: 2014/01/31
公開日: 2014/04/17
ジャーナル オープンアクセスEffects of grain morphology, particularly grain size, on the strengths and ductility of molybdenum alloy were investigated. Grain size after recrystallization of TZM alloy was generally smaller than that of pure molybdenum. Both the strengths and ductility of TZM alloy were much better than those of pure molybdenum and not worse than those of carbon-added molybdenum. However, after correcting difference of grain size, the strengths and ductility of TZM alloy became to be not better than those of carbon-added molybdenum, although still much better than those of pure molybdenum.抄録全体を表示PDF形式でダウンロード (1517K) -
竹内 慎二, 平林 洋太郎, 日比野 敦2014 年 61 巻 2 号 p. 73-81
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスIn order to develop highly efficient intermetallic compound material, synthesis process of a multi-component system needs to be established. In this paper, two-step combustion synthesis process of Ti – Ni – Al ternary intermetallic compound was investigated. In the first step combustion synthesis, elemental Ti and Al powders were mixed, and a compact made from the Ti/Al mixed powder was reacted by combustion synthesis. The synthesized product was crushed by a mortar and a ball milling machine, and fine TiAl powder was prepared. In the second step combustion synthesis, the TiAl powder and elemental Ti, Ni and Al powders were mixed, and a compact made from the (TiAl) + (Ti + Ni + Al) mixed powder was reacted by combustion synthesis. For the products obtained, density measurement, microstructure observation, X-ray analysis, Vickers hardness test, and SEM – EDX analysis were performed.
By using the two-step combustion synthesis process, products of about 85 − 90 % density were able to be synthesized. The synthesized product was consisted of matrix phase and dispersed phase. The synthesized phases were ternary intermetallic compound such as Ti2NiAl3(τ3), TiNi2Al(τ4), TiNiAl2(τ2), and the phases corresponded well with Ti – Ni – Al ternary phase diagram. It was confirmed that Ti – Ni – Al ternary intermetallic compound was able to be synthesized by the two-step combustion synthesis process.抄録全体を表示PDF形式でダウンロード (1763K)
特集：グリーン・プロセッシングによる機能性粉体の新展開
総報
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鈴木 久男2014 年 61 巻 2 号 p. 84
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスPDF形式でダウンロード (137K)
受賞記念講演
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寺尾 星明, 小日置 英明, 伊藤 孝至, 金武 直幸2014 年 61 巻 2 号 p. 85-92
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスCr – Cu materials have been developed for heat-sink application using P/M processing: Cr powder is sintered and Cu infiltrated. W – Cu and Mo – Cu materials, with low thermal expansion and high thermal conductivity, have been used for heat-sink application. However these materials having poor deformability and poor machinability raise processing costs for making heat-sink parts. W and Mo powder are both rare metals, very expensive and unstable to be supplied. Chromium is also a strong candidate for the heat-sink application, because it is the same 6A group element as W and Mo, its powder price is lower and more stable but its thermal properties are a little inferior to these of W and Mo. Pore free and inclusion free structure of Cr – Cu infiltrated compact, showing high quality of the following processes: rolling, pressing and Ni plating has been developed. To realize thermal properties of Cr – Cu close to those of Mo – Cu and W – Cu, the original three processes have been developed: secondary precipitation heat treatment, rolling and cladding with Cu. The developed materials could have high cost effectiveness for making parts though rolling and pressing to net-shape parts. Consequently Cr – Cu materials have succeeded in substitution for W – Cu and Mo – Cu materials for the heat-sink application.抄録全体を表示PDF形式でダウンロード (1483K)
研究論文
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間根山 しおり, 坂元 尚紀, 脇谷 尚樹, 大野 智也, 松田 剛, 鈴木 久男2014 年 61 巻 2 号 p. 93-98
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセス12CaO • 7Al2O3 (C12A7) crystal has 12 cages in the unit cell, and two free oxygen ions are encaged in the cages. These ions can be replaced with various anions by the appropriate processing to show various characteristics. Solution plasma processing is a method of synthesizing the material by vaporization of the liquid with a electric discharge, to be a plasma, as a reaction field. This method has advantage of rapid reaction at lower temperatures over conventional powder preparation methods because of the high density reaction field localized at the interface between liquid and gaseous phases. However, this method has been started to study in the recent years, therefore,there are many issues to be solved to apply it as a powder preparation method. In this study, C12A7 particles were synthesized from alkoxide-derived precursor solution by solution plasma processing for the low-temperature synthesis. The obtained C12A7 precipitates were characterized by XRD, TEM, and so on. As a result, C12A7 particles were successfully synthesized at low temperature of 200 ˚C or less by solution plasma processing, showing that this method will be a powerful tool to obtain nanopowders at low temperatures.抄録全体を表示PDF形式でダウンロード (1425K) -
奥田 卓也, 坂元 尚紀, 脇谷 尚樹, 宮崎 英敏, 太田 敏孝, 鈴木 久男2014 年 61 巻 2 号 p. 99-103
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスVanadium dioxide, VO2, undergoes the phase transition from monoclinic to tetragonal with property change from semiconductor to metal, respectively, at about 68 ˚C. Metallic tetragonal structure reflects infrared light, and semiconducting monoclinic structure transmits it, leading to the thermochromic smart window. On the other hand, the phase transition temperature is slightly higher than the room temperature and can be lowered by tungsten or the other metal cation doping. Furthermore, VO2 nanoparticles with lower transition temperature and particle size less than 100 nm is essential for the smart window because the light scattering can be dramatically suppressed by reducing the particle size to obtain a high transparency. In this study, we tried to control the particle size and phase transition temperature of VO2 nanoparticles by the microemulsion method. The resultant VO2 particles were characterized by XRD, DSC, SEM and TEM. Primary particle size of the resulting VO2 nanoparticles was estimated to be 25 nm with average agglomeration size of about 300 nm. The phase transition temperature for the W doped VO2 was 37 ˚C. As a result, we successfully synthesized the VO2 nanoparticles with controlled particle size and phase transition temperature by microemulsion method.抄録全体を表示PDF形式でダウンロード (977K)
新技術・新製品
新技術・新製品
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杉谷 雄史, 松本 誠一, 西田 元紀2014 年 61 巻 2 号 p. 107-109
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスPDF形式でダウンロード (983K) -
竹添 真一, 石井 義成, 丸山 恒夫, 野須 敬弘, 間 真司2014 年 61 巻 2 号 p. 110-111
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスPDF形式でダウンロード (546K)
本会記事
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2014 年 61 巻 2 号 p. Pref2_1-
発行日: 2014/02/15
公開日: 2014/04/17
ジャーナル オープンアクセスPDF形式でダウンロード (585K)
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