鉄系圧粉体の焼結時の寸法変化におよぼす黒鉛の特性の影響 Effect of Graphite Properties on Dimensional Change of Fe-Based Powder Compacts during Sintering

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The effect of graphite properties on the dimensional change of Fe-2mass% Cu-0.8mass%C-0.75mass% zinc stearate was examined by using two kinds of natural graphite, flaky graphite of 0.5-35μm and amorphous graphite of 3-9μm. The compacts were sintered in endogas. Their sintering behaviors were correlated with the properties of graphite.<BR>As the size of graphite decreased, the compacts shrank and the dimensional change varied according to 0.27 log(B/A)% when graphite was replaced from A to Bμm. Finely divided flaky graphite showed a rapid carburization, which led to the acceleration of sintering and the suppression of copper growth. When flaky graphite was divided to 0.5μm, however, the dimensional change did not obey above formula at all. In this case, the compact expanded at the temperature ranging from about 150 to 450°C and the carburizing rate markedly decreased above 970°C, with a large fraction of the graphite remaining after sintering. Amorphous graphite of 9μm also showed a similar expansion in the early sintering stage, but the carburizing rate did not decrease. Such behaviors led to a remarkable shrinkage by liquid generation due to the ternary monotecto-eutectic reaction above the melting point of copper.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 43(3), 383-389, 1996-03-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002011749
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    3936710
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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