Fe-Cu-C系圧粉体の銅膨張に及ぼす炭素分布の影響

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タイトル別名
  • Effect of Carbon Distribution on Copper-Growth of Fe-Cu-C Compacts
  • Fe Cu Cケイ アップンタイ ノ ドウ ボウチョウ ニ オヨボス タンソ

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The effect of uniformity of carbon concentration on the copper growth in liquid phase sintering of a Fe-Cu-C mixture was investigated. Dilatometric curves were recorded for Fe-8 mass%Cu-0∼0.9 mass%C compacts made of mixed elemental powders and Fe-10 mass%Cu-0∼0.9 mass%C compacts made of a coated Fe-Cu powder and graphite during 1130 K-or 1270 K-40 min presintering and 1400 K-40 min sintering processes in hydrogen. Spool models prepared by winding iron and copper wires on a cylindrical Fe-0.76 mass%C alloy were sintered at 1400 K for 8 min in argon and quenched into water in order to simulate the sintering phenomena of Fe-Cu-C compacts.<BR>The copper growth during liquid phase sintering of the Fe-Cu-C mixed powder compacts decreases with the increasing addition of graphite. The growth of the Fe-Cu-C compacts of identical composition has been higher with 1270 K presintering in the temperature range of γ iron, and lower with 1130 K presintering in the range of α iron or without the presintering. The level of the carbon solution into iron has been higher with the γ range presintering, and lower with the α range one or without them. The spool model has shown the solution-reprecipitation phenomena occurring between iron and the Fe-C alloy. These results suggest that the lack of uniformity of carbon concentration causes the solution-reprecipitation phenomena leading to the rearrangement of particles and the shrinkage or the suppressed expansion of compacts.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 59 (11), 1165-1171, 1995

    公益社団法人 日本金属学会

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