粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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62 巻, 6 号
June
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研究論文
受賞記念講演
  • 高圧合成を中心とした新規機能性酸化物材料の合成
    齊藤 高志, 島川 祐一
    2015 年 62 巻 6 号 p. 289-296
    発行日: 2015/06/15
    公開日: 2015/06/30
    DOIhttps://doi.org/10.2497/jjspm.62.289
    ジャーナル オープンアクセス
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    High pressure synthesis is a powerful technique for searching novel functional oxide materials. Perovskite oxides have rather dense crystal structure and hence are easily stabilized under pressures. We have been searching for novel A-site ordered perovskite oxides by a high pressure synthesis method, and have discovered a variety of compounds with interesting properties. Here we report on the synthesis and physical properties of new A-site-ordered perovskite oxides AMn3V4O12 (A = Na, Ca, La) with Mn in a square planar coordination. As the A-site cation changes from Na+ to Ca2+ and to La3+, the Mn/V sites are doped site-selectively, and local-spin magnetism by Mn ion and metallic transport property by V ion coexist. Spin-glass behavior is induced by mixed-valence Mn2.33+ in NaMn3V4O12, while unusual non-collinear 60°-spin structure of Mn2+ spins is found for LaMn3V4O12.
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解説
  • ―粉末冶金の新しい可能性―調和組織制御法による高強度・高延性材料の創製
    太田 美絵, 飴山 惠
    2015 年 62 巻 6 号 p. 297-301
    発行日: 2015/06/15
    公開日: 2015/06/30
    DOIhttps://doi.org/10.2497/jjspm.62.297
    ジャーナル オープンアクセス
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    Grain refinement is known as the one of the effective methods to improve strength of metallic materials. However, it is accompanied by lower ductility due to early stage plastic instability. Therefore, strength and ductility are in trade-off relationship. Our research group has proposed “Harmonic Structure Design”, having bimodal grain size distribution, which permits to achieve a combination of high strength and high ductility through Severe Plastic Deformation/Powder Metallurgy (SPD/PM) process. The Harmonic Structure has a peculiar feature that it consists of a three-dimensional continuous and inter-connected network of fine-grained regions. Moreover, although, the microstructure is heterogeneous at micro-scale, it is homogeneous at the macro-scale. The benefits of Harmonic Structure can be observed in the applicability of this microstructural design to a wide range of metallic materials, irrespective of the nature of material, phase, or crystal structure. FEM analysis estimated that the geometrically continuous fine-grained network structure prevents local strain concentration, leading to high ductility in the harmonic structure designed materials.
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研究論文
  • MM/SPSプロセスにより作製したハイス鋼/炭素鋼複合調和組織材料の摩耗特性
    藤原 弘, 續木 雄基, 宮本 博之
    2015 年 62 巻 6 号 p. 302-307
    発行日: 2015/06/15
    公開日: 2015/06/30
    DOIhttps://doi.org/10.2497/jjspm.62.302
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    The harmonic-structured material that consists of a network fine grain region with a high speed steel and a dispersed coarse grain region with a mild steel was fabricated prepared using a mechanical milling and spark plasma sintering process. The wear properties of harmonic-structured materials with the high speed steel volume fraction of 15.4 to 30.0 % were evaluated by the wear test of the ball-on-disk type. The wear property for Vickers hardness of the harmonic-structured material with the high speed steel volume fraction of 30.0 % is superior to various materials such as ferrous, non-ferrous materials and ceramic materials. The wear surfaces of the harmonic-structured materials were observed by the scanning electron microscope and laser microscope. The wear surface observation of harmonic-structured materials reveals that the wear property of the harmonic-structured material depends on the volume fraction of the high speed steel network region. The superior wear property of harmonic-structured material needs approximately 30.0 % of high speed steel volume fraction.
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  • ガラス廃材のボールミル粉砕処理による自己硬化性発現についての実験検討
    神谷 昌岳, 近藤 充記, 中平 敦
    2015 年 62 巻 6 号 p. 308-312
    発行日: 2015/06/15
    公開日: 2015/06/30
    DOIhttps://doi.org/10.2497/jjspm.62.308
    ジャーナル オープンアクセス
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    In order to construct the resources circulation society in Japan, we investigated the material recycling methods on huge amount of wasted glasses. Because wasted glasses could be chemically activated by ball milling method, and we tried to modify up to the environmental clean-up materials. The self-hardening phenomenon was confirmed from ball milled wasted liquid crystal display panel glasses after alkaline treatment. The characterization of the hardened samples was carried out. These results showed that the self-hardening induced mechano-chemical effects will open a new method for wasted glass utilizations.
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研究ノート
  • 放電プラズマ焼結法により焼結・接合したAg層を有するFeSi2熱電変換モジュールの熱電変換特性
    鈴木 裕宣, 藁谷 真也, 東 之弘, 髙澤 勇輝, 安野 拓也
    2015 年 62 巻 6 号 p. 313-317
    発行日: 2015/06/15
    公開日: 2015/06/30
    DOIhttps://doi.org/10.2497/jjspm.62.313
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    To achieve high performance of thermoelectric conversion module, it is important that the contact electric resistance between thermoelectric element and electrode is decreased. The manufacturing method to perform sintering of FeSi2 powder and joining of the sintered body with Ag metal plates at the same time was examined by using SPS(spark plasma sintering) method. The Ag plates were successfully joined to FeSi2 element by this process. In addition, it was able to lower the resistance of thermoelectric conversion module because the contact electric resistance between the FeSi2 element and the Cu electrode was decreased by joining Ag plates. The thermoelectric conversion modules with various element heights were produced by this process, and the performance of the modules was evaluated under several temperature differences. The most suitable thermoelectric module height, 5 mm, was decided by investigating relations of the module height and the performance. The FeSi2 thermoelectric conversion module consisting of 50 pairs of p-n elements was produced using an element with 5 mm height, and the performance was measured. As a result, the maximum electric power of FeSi2 thermoelectric conversion module of 50 pairs was 1.70 W in the condition of heating temperature at 873 K and/or cooling temperature at 293 K.
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