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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63 巻, 2 号
February
選択された号の論文の11件中1～11を表示しています
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総報：平成27年度秋季大会（講演特集）
研究論文
研究論文
  • 圧粉磁心の硬さ，保磁力に及ぼす鉄粉内部の酸化物粒子の影響
    西 和也, 青野 泰久, 岡本 和孝, 今川 尊雄, 相馬 憲一
    2016 年 63 巻 2 号 p. 63-69
    発行日: 2016/02/15
    公開日: 2016/03/05
    DOIhttps://doi.org/10.2497/jjspm.63.63
    ジャーナル オープンアクセス
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    Soft magnetic composite (SMC) cores, produced by compacting insulated iron powders, are expected to improve the efficiency of motors and boost converters. Low-cost water atomized iron powders are used as raw materials for SMC cores. Since the water atomized iron powders containing a large amount of oxygen impurity, there is a problem that the magnetic properties of the SMC cores are deteriorated due to oxygen impurity. First, green compacts were made by several kinds of water atomized iron powders in which oxygen content levels are different, then were annealed in vacuum. It was found that the coercivity and the hardness of these compacts were proportional to the oxygen concentration in iron powders. By TEM observation of the compacts, it was confirmed that there were very fine oxide particles smaller than 10 nm in inside of the iron powders, and that the number density of oxide particle increase with increase in oxygen concentration. From a correlation between coercivity and particle number density, it was predicted that the existence of ultrafine oxide particles caused the increase in coercivity.
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  • 成形工程における段差近傍の表面荒れ形成におよぼす成形体形状の影響
    田中 義浩, 川瀬 欣也, 河野 肇
    2016 年 63 巻 2 号 p. 70-76
    発行日: 2016/02/15
    公開日: 2016/03/05
    DOIhttps://doi.org/10.2497/jjspm.63.70
    ジャーナル オープンアクセス
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    Prevention of cracks during compaction is one of the most important quality issues in the PM industry. Therefore, various types of the mechanisms of crack formation have been studied both in the academic and the practical areas. However, the mechanism of the formation of the micro crack, which is often formed on the boss near the corner of a step and not at the corner of a step, has not been clarified. In this study, a powder mix of Fe-Cu-C system was compacted with a stepped die, to investigate the influence of the powder compact geometry on the micro crack formation. The influence of the powder compact geometry on micro crack formation is discussed from the view points of the powder compaction experiment and FEM analysis.
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