Abstract
Sm2Fe17 alloy as a precursor of a potential permanent magnet (Sm2Fe17Nx) has been paid attention to, but the pure one obtained has been still very difficult until now due to having a distinct difference of melting point between Fe and Sm metals as raw materials, it impairs seriously the magnetic performance of Sm2Fe17Nx. In this work, this problem was solved successfully using a method of molten salt electrolysis. A chronopotentiometry was used at 1100 °C to obtain a single phase Sm2Fe17 alloy as product on iron cathode in CaCl2-CaF2-SmCl3, simultaneous a series of electrochemical measurements were carried out to reveal the electrochemical behavior. The preparation of Sm2Fe17 alloy was carried out by the chronopotentiometry to find that the thickness of Sm2Fe17 layer increasing with the increase of the initial concentration of Sm3+ when the initial concentration of Sm3+ was less than 1.74 × 10−5 mol cm−3, while it increased not obvious when the initial concentration of Sm3+ exceeded 1.74 × 10−5 mol⋅cm−3 due to increasing the resistance of Fe diffusion as increasing of Sm2Fe17 layer thickness in the late process.
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