Preparation and characterization of nano-Fe50Ni50 alloy powder by chemical co-precipitation hydrogen reducing process

摘要

In this paper, the 0.1mol·L-1FeSO4,NiSO4 mix-solution and 4mol·L-1 NaOH solution were prepared by FeSO4·7H2O, NiSO4·6H2O and NaOH as raw materials. The Ni-Fe precursor nano-powders were prepared by chemical co-precipitation. The reaction conditions were that dropping speed 50ml·min-1, pH value of reacting terminal 12, stirring speed 1200 r·min-1, reacting temperature 20℃, reacting time 40min. The shape of Ni-Fe precursor nano-powders were nano-stick and nano-ball. Length of Fe50Ni50 precursor nano-stick was 100-150nm, diameter was 10-30nm. Diameter of Fe50Ni50 precursor nano-ball was 10-50nm. The Fe50Ni50 alloy nano-powders were prepared with materials Fe50Ni50 composite oxide by hydrogen co-reduction in closed circular system. The process conditions were that reduction temperature 600℃,reduction time 30 minute. The Fe50Ni50 alloy nano powders size was less than 100nm. Key Words:Fe50Ni50 alloy;hydrogen co-reduction;co-precipitation;nanometer