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采用机械合金化结合氩气退火法成功制备了β-FeSi2热电材料,并用XRD、SEM对不同球磨时间后的Fe-Si粉体进行结构及形貌表征.试验结果表明:随着球磨时间的延长,颗粒不断细化,最后可得到Fe-Si纳米晶合金;球磨20h后,Fe衍射峰宽化而Si衍射峰逐渐减弱,形成α-Fe(Si)过饱和固溶体;球磨120h后出现合金ε-FeSi、β-FeSi2相;调整Si/Fe原子比例为2.3,对球磨120h后合金粉末在800℃退火20h,可以得到单相β-FeSi2热电材料.
The β-FeSi2 thermoelectric material was successfully prepared by mechanical alloying and argon annealing, and the structure and morphology of the Fe-Si powder after different milling time were characterized by XRD and SEM.The results showed that with the increase of ball milling time , And the particles are refined continuously. Finally, the Fe-Si nanocrystalline alloy is obtained. After milling for 20h, the diffraction peaks of Fe are broadened and the Si diffraction peaks are gradually weakened to form α-Fe (supersaturated) supersaturated solid solution. FeSi, β-FeSi2 phase. The Si / Fe atomic ratio was adjusted to 2.3. The alloy powder was annealed at 800 ℃ for 20 h after ball milling for 120 h, and the single-phase β-FeSi2 thermoelectric material was obtained.