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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61 巻, 6 号
June
選択された号の論文の14件中1～14を表示しています
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研究論文
研究論文
  • パルス通電焼結法により作製したWC–FeAl 複合体の組織と 機械的特性に与える粉末中の酸素量の影響
    古嶋 亮一, 加藤 清隆, 中尾 節男, 孫 正明, 下島 康嗣, 細川 裕之, 松本 章宏
    2014 年 61 巻 6 号 p. 281-289
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.281
    ジャーナル オープンアクセス
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    The effect of oxygen content in WC–FeAl powder is examined on mechanical properties of the sintered composites. The oxygen content is varied by controlling the milling and/or drying processes of the WC–FeAl mixed powder. The WC–FeAl composites are obtained by sintering the mixed powders with the pulse current sintering technique. Transverse rupture strength is improved by reducing the oxygen content in the mixed powder whereas the difference of microstructure and composition is not observed clearly. Some results suggest that oxidation of FeAl during the preparation of the WC–FeAl mixed powder affects the mechanical properties of WC–FeAl products. It is concluded that oxygen content is very important for controlling the mechanical properties of WC–FeAl products.
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  • Fe–Cu 合金粉を用いたFe–2%Cu–0.8%C 焼結鋼の組織と強度
    岩岡 拓, 藤木 章
    2014 年 61 巻 6 号 p. 290-297
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.290
    ジャーナル オープンアクセス
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    Both copper wires and ferrous chassis are included in automotive scrap. Copper can directly influence the mechanical properties of steel products, and is generally considered to be a harmful tramp element. In contrast, copper is actively used for various sintered machine parts, because the Fe–Cu–C type can combine performance and economical efficiency, and does not require the advanced technique. Thus, a study was conducted utilizing powder metallurgy and Fe–Cu alloy powder to determine the possibility of using the rational processing of recycling copper-rich scrap. The microstructure and strength of the Fe–2%Cu–0.8%C compacts sintered with Fe–Cu alloy powder, were considerably influenced by the Fe/Fe–Cu powder mass ratio. The weight change decreased with the increase in the Fe/Fe–Cu powder mass ratio. This shows that graphite was consumed to reduce the reaction of oxide film on the Fe–Cu alloy powder surface. The strength of sintered compacts increased as the Fe/Fe–Cu powder mass ratio increased. For example, when Fe–Cu alloy powder is used in conjunction with an oxide film, the desirable Fe/Fe–Cu powder mass ratio is more than 3 in order to obtain a sintered compact with transverse rupture strength higher than 700 MPa.
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  • 非晶質Li3PS4 を固体電解質として用いた電気化学セルにおける炭素系負極材料(MCMB) の電気化学的特性
    小川 明純, 町田 信也, 木下 俊二, 内藤 宗幸, 重松 利彦
    2014 年 61 巻 6 号 p. 298-305
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.298
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    Electrochemical properties of the mesocarbon microbeads (MCMBs) were investigated as anode active materials for an all-solid-state cell in which amorphous Li3PS4 (a – Li3PS4) was used as solid electrolytes and Li – In alloy was used as a counter electrode. The amount of Li+ ions that were inserted into the MCMBs denoted as x in the notation LixC6 (0 < x < 1). X-ray diffraction measurements suggested that Li+ ions were inserted into the disordered portions of MCMBs at the initial reaction stage with the composition range of 0 < x < 0.13. After the initial reaction stage, Li+ ions were intercalated into the graphite layers of MCMBs in the composition range of 0.13 < x < 0.91. The Li+ ions inserted into the disordered portions of MCMBs could not be extracted in the discharge process and then caused the irreversible capacity of the first charge-discharge cycle. On the other hand, Li+ ions that were intercalated into the graphite layers can be reversibly deintercalated in the composition range of 0.13 < x < 0.91. The charge-discharge capacity of the MCMBs was gradually decreased with an increase in the cycle number. Raman spectroscopy suggested that the capacity fading during the charge-discharge cycles would be caused by the deterioration of the MCMBs’ crystallinity.
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  • 小型・薄肉形状の造形に適した新しい粉末成形技術
    石島 善三, 三浦 秀士
    2014 年 61 巻 6 号 p. 306-310
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.306
    ジャーナル オープンアクセス
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    In order to improve the compactibility of tiny and thin thickness products, we have developed a new die compacting method which uses MIM’s raw material. A thin cup with a diameter of φ 2 was formed as an example. The W–Ni mixed powder and binder were kneaded and formed the pellets by backward extrusion, and clarified their deformation behavior. It was found that the deformation behavior consists of 3 stages; an initial stage of deformation until the pellet contact with the die as a result of upsetting, an intermediate stage of deformation from the contact with the die until the extrusion of the cup wall begins, during which the cavity is filled, and a final stage of deformation at which the wall undergoes further extrusion. The fluidity (viscosity) of the kneaded material becomes dominant at the molding of the cup wall part, and molding of a wall is increasingly influenced by pressure loss as decreasing wall thickness. Eventually, a compacting technology was established for cup shapes having a minimum thickness of 0.05 mm in the green compact which resulted in 0.04 mm by sintering.
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特集：これからの自動車に貢献する高機能焼結材料
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研究論文
  • 低Cr プレアロイ粉の焼結体特性に及ぼすCu，黒鉛添加の影響
    前谷 敏夫, 宇波 繁, 尾野 友重, 尾崎 由紀子, 小倉 邦明
    2014 年 61 巻 6 号 p. 313-317
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.313
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    The mechanical properties of the sintered compacts made of the Fe–0.5mass%Cr–0.2mass%Mn–0.2mass%Mo prealloyed powder (JIP® 5CRA) have been investigated. Tensile strength and hardness of the 5CRA material increased with the increases of addition of Cu and graphite, respectively. 5CRA–2.0mass%Cu–1.0mass%Gr material showed high-strength equivalent to that of the Fe–4.0mass%Ni–1.5mass%Cu–0.5mass%Mo–0.6mass%Gr material. Microstructure of the sintered compact of the 5CRA material containing Cu was consists of fine pearlite and some bainite. High-strength of the 5CRA material would be obtained by the effect of solid solution strengthening due to Cu addition and finer pearlite with graphite addition.
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  • Ni–Mo 系低合金鋼粉を適用した焼結転造浸炭歯車の特性
    西田 智, 吉田 眞規, 鈴木 浩則, 竹増 光家, 小出 隆夫
    2014 年 61 巻 6 号 p. 318-323
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.318
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    Finish gear rolling experiments, single tooth bending fatigue tests and gear running tests were carried out using P/M gears made of Ni–Mo pre-alloyed steel powder. A high precision CNC form rolling machine of two-roller dies transverse type was employed. The entire gear tooth flank was successfully densified from the tip to the root fillet by surface rolling. The durability test results show that the test case-carburized P/M gears with a density of 7.5 g/cm3 can achieve bending and surface fatigue strengths of 1.0 GPa and 2.0 GPa, respectively, which completely match with those of case-carburized SCM415 (0.15C–1.0Cr–0.2Mo–0.7Mn) wrought steel gears and those load bearing capacities tend to increase by surface rolling. The compressive residual stress near the gear flank surface is the level of 800 MPa, which is almost equivalent to that of wrought steel gear. The representative damages of P/M gears in gear running tests are pitting, which is the case with the wrought steel gear.
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  • 液相－固相反応法とパルス放電焼結法を用いて作製したMg2Si の焼結性と 熱電特性に及ぼすAl 添加の影響
    伊藤 孝至, 富永 彰, 地主 孝広, 石島 善三
    2014 年 61 巻 6 号 p. 324-328
    発行日: 2014/06/15
    公開日: 2014/08/18
    DOIhttps://doi.org/10.2497/jjspm.61.324
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    Mg2Si compound is a promising material available for thermoelectric power generation using waste heat of temperature range of 600 to 900 K. However, high vapor pressure of molten Mg makes difficulties in synthesis of Mg2Si compound and in sintering. In order to overcome these problems, we synthesized the Mg2Si compound under Mg–rich condition by the liquid-solid phase reaction and sintered the synthesized powder by the pulse discharge sintering. In this study, we attempted to add aluminum of 0−2.0 at.% to the Mg2Si and investigated the influence of addition of aluminum on sinterability and thermoelectric properties. Addition of Al brought to improvement of the sinterability and reduction of the electrical resistivity. The 1.0 at.% Al–added sample had the maximum dimensionless figure of merit of 0.86 at 873K.
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