Preparation of .BETA.-FeSi2 Using Reaction and Sintering under Hipping Pressure.

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  • Hosokoshi Takashi
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo
  • Ito Shigeru
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo
  • Akashi Kazuo
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo

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  • ＨＩＰ圧下における反応および焼結を利用したβ－ＦｅＳｉ２焼結体の作製
  • HIP アッカ ニ オケル ハンノウ オヨビ ショウケツ オ リヨウシタ ベー

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Abstract

In order to obtain sintered FeSi2, the mixed powder of Fe and Si has been hipped at below the decomposition temperature of 986°C. In this process, the reaction and the densification have been proceeded simultaneously. Before the hipping of powders, the reaction of Fe plate and Si plate was examined to understand the reaction of Fe and Si under hipping condition. It was found that high temperature and low pressure accelerated the reaction. Based on the results, hipping conditions of the powder were decided. Single phase of FeSi2 was obtained under the hipping condition of 850 - 900°C, 50MPa and 30min -4hours. However, the relative densities of the hipped specimens were 82 - 90%. To obtain higher density, the mixed powder was hipped under 50 MPa to be caused the reaction completely, and then was densified under high pressure of 200MPa. Applying this 2 stage hipping, the relative density increased up to 98%. It is concluded that HIP technique is useful for the materials which transform at high temperature.

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