The Dependence of X-ray Diffraction Pattern Upon the Process of Sintering in Fe-Al-Ni Magnet Alloy

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  • Fe-Al-Ni焼結磁石の焼結過程に伴うX線回折像の変化
  • Fe-Al-Ni ショウケツ ジシャク ノ ショウケツ カテイ ニ トモナウ Xセン カイセツゾウ ノ ヘンカ

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Abstract

The process of sintering in FeAl2-Ni-Fe system (Al 12%, Ni 25%, Fe 63%) is discussed in this paper. The relation between the X-ray diffraction pattern and the sintering process of water-quenched specimens from their sintering temperature, and the particle size effect of starting powder on the sintering process and the magnetic properties of the sintered specimens has been investigated. The results were as follows: (1) At the sintering temperature of 700°C, the change in electrical resistivity and X ray diffraction pattern at the various stages of diffusion of component particles has been observed. (2) When sintering temperature reached 1250°C, rapid alloying of component particles has been observed and a new phase (α-phase) has been found in X ray diffraction pattern. (3) The effect of compacting pressure upon the sintering process with liquid phase has been found to be larger than that without liquid phase is in existence. (4) An intense effect of particle size of the powder used upon the rate of homogenization has been found. (5) The effect of sintering temperature upon the sintering process of the FeAl2-Ni-Fe system has been found to be larger than that of sintering time. (6) Excellent magnetic properties could be obtained under favorable conditions.

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