机械-化学法合成的γ-72Ni28Fe纳米晶材料

Mechano-chemical Synthesis of Nanosized γ-72Ni28Fe Powder

应用机械-化学法成功地制备出纳米r-72Ni28Fe合金，通过XRD、TEM、SEM、EDS、BET等测试手段分析了不同球磨时间及氢气还原温度对粉末结构、颗粒尺寸等的影响。结果表明：600℃氢气中还原、原位合金化30min，r-72Ni28Fe合金的晶粒在10-30nm，平均颗粒尺寸为50-60nm，其杂质含量很低；还原温度低于600℃难以完全合成r-72Ni28Fe，而还原温度高于850℃时，晶粒会迅速长大(D111>120nm)。

Nanosized g-72Ni28Fe alloy was successfully synthesized by mechano-chemical method, and the microstructures and particle size dependence on synthesis conditions were investigated by using various techniques, including XRD, TEM, SEM, EDS and BET. The results indicate that the grain size of g-72Ni28Fe alloy, which were reduced and in-situ alloyed for 30min at temperature of 600℃ in H2, was 10~30nm and average particle size was about 50~60nm. The impurity contents in g-72Ni28Fe alloy were very low. Moreover, it is revealed that the H2 reduction at temperature below 600℃, would lead to an incomplete g-72Ni28Fe alloy in production; if the H2 reduction is carried out at temperature above 850℃, grain size would grow rapidly (D111>120nm).