Study On Synthesis And Properties Of Nanostructured Iron Series Element Alloy

Since a lot of applications of ultrafine amorphous Iron series alloy have been found in magnetic recording, catalysis, ferrofluid, and wave absorbing materials, etc., much attention has been paid to the synthesis process of nanostructured Fe series alloy. The physical and chemical properties of such objects depend on their shape and particle size.The theory of preparing nanostructured alloy in a liquid solution: In the same condition, the reducing agent can simultaneously reduce two or more soluble metal-salt to metal, then with the adding up of reducing agent, the metal-salt is reduced to nanostructured alloy. In this article, hydrazine, sodioum hypophoshite , Zinc powder and potassium borohydride were studied respectively. In the end, we choosed potassium borohydride as reducing agent. Fe-Ni, Fe-Co, Co-Ni, Fe-Co-Ni alloy were prepared by chemical reduction in a mixed solution of soluble metal salt. Fe-Cu, Co-Cu, Ni-Cu, Fe-Co-Cu, Fe-Ni-Cu, Co-Ni-Cu, Fe-Co-Ni-Cu were also synthesised by Chemical reduction.Fe-Ni alloy fiber were first prepared in a mixed solution of ferrous and nickelous salts, using KBH4 as a reducing agent. Conditions, such as quantity of NaOH, concentration of salts, and species of surfactants, of preparation of Fe-Ni alloy were studied. The result show that Fe-Ni alloy were soft magnetic materials and they exhibited superparamagnetization at room temperature that have been widely used in industry. Nanostructured Fe-Ni alloy have been particularly emphasized because of their high permeability, low coercive force and relatively high saturation magnetization. Fe-Ni alloy fiber were also used as wave-absorbing materials. Fe-Co, Co-Ni, Fe-Co-Ni alloy were armphous soft magnetic materials. They also have higher saturation magnetization, lower coercive force, exhibit superparamagnetization, and they are good sofy magnetic materials. Fe-Co alloy was spherical, coalescence of small particles. Co-Ni alloy was spherical, arranged in chains. The saturation magnetization of alloy are Fe-Ni: σs=46.53 Am2.kg-1 (higher than microemulsion σs=33.76 Am2 kg-1), Fe-Co: σs=47.87 Am2 kg-1, Co-Ni: σs=41.01 Am2 kg-1, Fe-Co-Ni: o .=45.91 Am2 kg-1. Because the magnetism of cobalt is strongest, the saturation magnetization of Fe-Co alloy isthe largest. The saturation magnetization of Cu-series alloy are Fe-Cu: σS=11.17 Am2 kg-1, Co-Cu: σs =11.29 Am2 kg-1, Ni-Cu: σs =9.42 Am2 kg-1, Fe-Ni-Cu: σ s= 14.96 Am2 kg-1, Fe-Co-Cu: σs= 18.78 Am2 kg-1, Co-Ni-Cu: o =12.94 Am2 kg-1', Fe-Co-Ni-Cu: σ s=13.66 Am2kg-1. They are all lower than Iron-series alloy, their coercive force is zero, they exhibited superparamagnetization at room temperature and good soft magnetic materials. It is well known that the thermal and electrical conductivities of Copper is better, in order to enhanced the thermal and electric conductivities of Fe-series alloy. We synthesised Cu-series alloy.