Abstract
In the results of one-step sintering, the relations between applied pressure, heating rate, densification, and β-FeSi2 formation are as follows. There is a tendency that the higher applied pressure, the higher densification and the easier β-FeSi2 formation. On the other hand, there is a tendency that the lower heating rate, the higher densification, and the higher heating rate, the easier β-FeSi2 formation. However, if the applied pressure and heating rate are too high, it will become a reaction exceeding eutectic temperature. It is supposed that there is no advance in the formation of β-FeSi2 during the heating and the formation of β-FeSi2 proceeds during the holding time. In addition, β-FeSi2 of high density (about 95%TD) was produced by two-step sintering. Results show that, 750°C is suitable for the sintering temperature of 2nd step sintering. At that condition, remaining of some ε-FeSi was observed, while α-FeSi2 almost disappeared.
