大块高纯Fe3C的高温高压合成

Synthesis of Pure Bulk Fe3C under High Temperature and High Pressure

Fe3C(渗碳体)是一种用途广泛、力学和磁学性能优良的材料,因而其制备方法一直受到人们的关注。通过高温高压下铁和碳的固相反应,成功制备出大块、致密、高纯的 Fe3C 样品,探索了原料种类、颗粒大小、合成温度、合成压力、保温时间等因素对烧结样品的影响。结果表明:当 Fe粉粒径为 9 μm,石墨粒径为 1.3 μm,在 4 GPa、1000 ℃条件下烧结的 Fe3C最为致密。

Fe3C (cementite) is a widely used material with excellent mechanical and magnetic properties;therefore the preparation method of Fe3C has been widely concerned. In this paper, dense and high-purity bulk Fe3C samples were prepared based on the solid-phase reaction of iron and carbon under high temperature and high pressure, and the influence of raw material type, particle size, sintering temperature, pressure, and holding time are investigated for the sintered samples. It shows that the densest samples were produced under the sintering pressure and temperature of 4 GPa and 1000 C when the Fe and graphite particles were 9 μm and 1.3 μm respectively.