机械合金化方法制备Fe－Si纳米晶粒子的研究

Study on the Preparation of Fe-Si System Nanocrystallines by Mechanical Alloying Process

用机械合金化（ＭＡ）方法制备了Ｆｅ１００－ｘＳｉｘ（ｘ＝２０．３０．４０．７０）纳米粒子．当Ｓｉ＜３０ａｔ％时，球磨产物主要是α－Ｆｅ（Ｓｉ）．随着Ｓｉ含量升高．Ｆｅ和Ｓｉ的化合物在球磨粉末中所占比例逐渐增大．实验结果表明．Ｆｅ－Ｓｉ粉末随球磨时间增加粒径减小，Ｆｅ６０Ｓｉ４０混合粉末经１２０ｈ球磨可得到粒径为７ｎｍ的晶粒．

Nanocrystalline materials of100-xSix(x=20. 30, 40. 70) system have ben prepared by mechanical alloying (MA) process. with samples. microstructure examined throush XRD and magnetic measurement. The results showthat the particle size of MA Powder decreases gradually with the operating time of bell mill.and a Fe60Si40 sample withparticle site of 7 nm is available if the milling time up to 120 h.