Synthesis of Mg2Si based thermoelectric composite by mechanical alloying.

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  • Sugiyama Akira
    Advanced Processing Laboratory, Materials Processing Department, National Industrial Research Institute of Nagoya
  • Kobayashi Keizo
    Advanced Processing Laboratory, Materials Processing Department, National Industrial Research Institute of Nagoya
  • Ozaki Kimihiro
    Advanced Processing Laboratory, Materials Processing Department, National Industrial Research Institute of Nagoya
  • Nishio Toshiyuki
    Advanced Processing Laboratory, Materials Processing Department, National Industrial Research Institute of Nagoya
  • Matsumoto Akihiro
    Advanced Processing Laboratory, Materials Processing Department, National Industrial Research Institute of Nagoya

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  • メカニカルアロイングを利用したＭｇ２Ｓｉ基複合熱電材料の作製
  • メカニカルアロイング オ リヨウ シタ Mg2Siキ フクゴウ ネツデンザイリ

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Abstract

The formation process of Mg2Si based thermoelectric composite made by mechanical alloying was investigated.<BR>The MA was performed in a planetary ball mill using three elemental powders. The powders were prepared by the mixing of Mg2Si, Mg2Si-xmass%SiC(x=4, 8) and Mg2Si-xmass%FeSi2 (x=20, 40, 60, 80, 100). The structural evolution during milling was detected by X-ray diffraction(XRD). The heat treatment was monitored by differential scanning calorimetry(DSC). Microstructural changes were mainly investigated by means of scanning electron microscopy(SEM) and optical microscopy(OM).<BR>The formation of the Mg2Si phase is observed after milling for 1080ks under At atmosphere. But the milling time to form Mg2Si became shorter by milling with including another element such as Fe, Si, N and SiC. The structure of Mg2Si milled under N2 atmosphere became most fine. For Mg2Si-xmass%FeSi2 including less than 60mass%FeSi2, the phase of Mg2Si, FeSi, Fe and Si were observed in the powder milled after 360ks. On the other hand, for Mg2Si-80mass%FeSi2, the phase of Mg2Si and FeSi was not observed but Fe and Si was only observed independent on milling time.

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