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采用高能球磨法制备出了平均颗粒尺寸为纳米级的超细Fe-C粉末。利用SEM、XRD等分析手段研究了球磨时间和转速对Fe-C超细晶/纳米晶粉末颗粒形貌、尺寸和合金化效果的影响。结果表明,Fe-C超细晶/纳米晶粉末的过程中,颗粒尺寸随球磨时间和转速的增加而得到有效细化。当球料比为20:1、转速350r/min、球磨70 h时,颗粒细化效果最好。将球磨后平均颗粒尺寸为纳米级的粉末进行SPS烧结,烧结温度700℃时,能实现烧结体完全致密,并可有效避免晶粒的长大,该烧结体材料抗压强度达2800MPa。
Ultrafine Fe-C powder with average particle size of nanometer was prepared by high energy ball milling. The effects of milling time and speed on the morphology, size and alloying effect of Fe-C ultrafine-grained / nanocrystalline powders were investigated by means of SEM and XRD. The results show that the particle size of Fe-C ultrafine-grained / nanocrystalline powders is effectively refined with the increase of ball milling time and rotating speed. When the ball material ratio of 20: 1, speed 350r / min, ball milling 70 h, the best particle refinement. The average particle size of the ball mill after the nano-sized SPS sintering, sintering temperature of 700 ° C, the sintered compact can be achieved completely, and can effectively prevent the grain growth, the sintered material compressive strength of up to 2800MPa.