Formation Mechanism of Microchannels and Lining Layers in Sintered Iron Powder Compacts with Copper Sacrificial Cores

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  • Ohmi Tatsuya
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Kodama Takuhiro
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Iguchi Manabu
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

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The formation mechanism of microchannels with Fe-Cu alloy lining layers in iron bodies produced by a powder-metallurgical microchanneling process has been investigated. Copper wire was used as a sacrificial core that gives the shape of the microchannel and supplies the alloying element for the lining layer. An iron powder compact containing the sacrificial core was heated and sintered at temperatures between the melting points of copper and iron. Quenching experiments showed that the microchannel was produced just after melting of copper. In a quenched specimen with a newly-formed microchannel, fine copper-rich regions were observed between the iron powder particles in the lining layer. These results established that infiltration of molten copper into the iron powder is the dominant mechanism for the Fe-Cu microchanneling process. It was also found that the liquid copper infiltrated via preferential flow pathways between the iron powder particles.

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 50 (12), 2891-2896, 2009

    公益社団法人 日本金属学会

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