The Sinterability Improvement of Ferrous Alloy Sintered Compacts by Controlling Particle Size Distribution

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  • Nakagomi Yöhei
    Graduate School of Mechanical Engineering, Tokyo City University
  • Hida Shogo
    Graduate School of Mechanical Engineering, Tokyo City University
  • Mochidzuki Tomohito
    Department of Mechanical Engineering, Faculty of Engineering, Tokyo City University
  • Fujima Takuya
    Department of Mechanical Engineering, Faculty of Engineering, Tokyo City University
  • Takagi Ken-ichi
    Department of Mechanical Engineering, Faculty of Engineering, Tokyo City University

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  • 粒度分布コントロールによる鉄系焼結体の焼結性の改善
  • リュウド ブンプ コントロール ニ ヨル テツケイ ショウケツタイ ノ ショウケツセイ ノ カイゼン

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Abstract

Effect of particle size distribution on the density and shrinkage of gas-atomized ferrous alloy powder compacts were investigated by controlling particle size distribution of the two bimodal ferrous alloy powders (-25 μm/125-150 μm, 25-46 μm/125-150 μm). These powders were sintered at 1473 K in vacuum after compacted at the pressure of 490 MPa. As a result, the sintered compact of -25 μm/125-150 μm bimodal powder with fine powders content 35 mass% showed higher density and lower shrinkage ratio than those of other powder compacts. The improvement of particle packing depended strongly on the size ratio and mixing ratio of the fine to coarse powder.

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