Effects of Sintering Condition on Young's Modulus of Carbonyl Sintered Iron

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  • カーボニル焼結鉄のヤング率に及ぼす焼結条件の影響
  • カーボニル ショウケツ テツ ノ ヤングリツ ニ オヨボス ショウケツ ジョウ

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Abstract

The authors have reported previously that the dynamic resonance means for measuring Young's modulus of sintered iron gives better accuracy and reproducibility than the mechanical testing. Inthe present paper some factors affecting the Young's modulus of sintered iron are discussed taking the pore structure into account.<BR>Most of the specimens, 4×4×40 mm, were prepared from carbonyl iron powder, followed by compacting under 2 to 9t/cm2, presintering for 20 min at 650°C and sintering for 0 to 30 hr at 700 to 1200°C in hydrogen atmosphere.<BR>Young's modulus of sintered iron was found to be highly dependent on the pore shape, but it was independent on the grain size, the pore size, and the preferred orientation of crystals. Since commercial sintered iron has irregular pore shape, its Young's modulus is low. To make the Young's modulus of commercial sintered iron as high as that of carbonyl sintered iron with the same density, sieved fine powder should be sintered for long time or the porosity should be lower than about 6%.<BR>Though it has been said that the sinterability is good at high temperatures in a phase, from the point of view of core shave and its notch effect, it is no good for material nrooerties to sinter in short time, about 1 hr.

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